Endometritis / Metritis

Endometritis and metritis are inflammatory conditions affecting the uterus of cattle, representing two of the most economically significant reproductive disorders in the dairy and beef industries. While these terms are sometimes used interchangeably, they represent distinct clinical entities with different timelines and severity levels. Metritis refers to inflammation involving all layers of the uterine wall, typically occurring within the first twenty-one days after calving, while endometritis specifically involves inflammation of the endometrium, the inner lining of the uterus, and is generally diagnosed after twenty-one days postpartum. Both conditions result from bacterial contamination of the uterus following parturition, with the severity depending on the type and quantity of bacteria present, as well as the immune response of the individual animal.

These uterine infections affect cattle worldwide and represent a major challenge for dairy producers in particular. Studies indicate that metritis affects approximately twenty to forty percent of dairy cows in the postpartum period, with clinical endometritis subsequently developing in fifteen to twenty percent of animals. The prevalence varies considerably based on management practices, herd health programs, calving conditions, and regional differences in housing and nutrition. High-producing dairy herds often experience higher incidence rates due to the metabolic stress associated with early lactation and the negative energy balance that compromises immune function during this critical period.

The economic impact of endometritis and metritis extends far beyond the immediate treatment costs. These conditions significantly reduce fertility, extending the calving interval and decreasing lifetime productivity of affected animals. Cows with uterine infections experience delayed return to estrus, reduced conception rates, increased services per conception, and higher culling rates. Additionally, metritis often causes decreased milk production during the acute phase of illness, while subclinical endometritis can silently reduce fertility without obvious clinical signs. The total economic losses from these conditions include veterinary expenses, medication costs, extended days open, reduced milk yield, and premature culling, making prevention and early detection essential components of profitable cattle operations.

Fortunately, both endometritis and metritis are treatable conditions when identified promptly and managed appropriately. The prognosis for recovery is generally favorable with proper veterinary intervention, though fertility may remain compromised in some animals depending on the severity and duration of infection. Early detection through routine postpartum examinations allows for timely treatment, which significantly improves outcomes and reduces the long-term impact on reproductive performance. Understanding the risk factors, recognizing early warning signs, and implementing comprehensive prevention strategies are crucial for minimizing the incidence and impact of these important reproductive disorders in cattle herds.

The primary cause of endometritis and metritis is bacterial infection of the uterus following calving. During parturition, the cervix dilates and the reproductive tract becomes exposed to environmental pathogens, allowing bacteria to ascend into the normally sterile uterine environment. The most commonly isolated bacteria include Escherichia coli, Trueperella pyogenes, Fusobacterium necrophorum, Prevotella species, and Bacteroides species. These organisms often act synergistically, with E. coli typically colonizing the uterus first and creating conditions that favor subsequent infection by anaerobic bacteria. The severity of infection depends on the bacterial load, the specific pathogens involved, and the ability of the cow's immune system to clear the contamination before clinical disease develops.

While no specific genetic predisposition has been identified for uterine infections, certain inherited traits may influence susceptibility. Cows with compromised immune function, whether due to genetic factors affecting immune response or metabolic conditions that impair immunity, face increased risk. Additionally, conformation traits that affect calving ease, such as pelvic structure and calf birth weight genetics, indirectly influence metritis risk by affecting the likelihood of dystocia and associated trauma. Some research suggests heritability of certain aspects of uterine health, though environmental and management factors play a more significant role than genetics in determining individual susceptibility to these infections.

Environmental and management factors substantially influence the development of uterine infections in cattle. Calving environment hygiene plays a critical role, as contaminated calving areas increase bacterial exposure during the vulnerable periparturient period. Overcrowding, inadequate bedding, poor ventilation, and infrequent cleaning of maternity pens all contribute to higher bacterial loads in the environment. Additionally, management practices during and after calving significantly impact infection risk. Improper assistance during difficult calvings, failure to maintain hygiene during obstetrical interventions, and inadequate monitoring of postpartum cows all increase the likelihood of uterine infection development.

Several specific risk factors have been identified that predispose cattle to developing endometritis and metritis. Dystocia, or difficult calving, represents one of the most significant risk factors, as it causes trauma to the reproductive tract and often requires manual intervention that can introduce bacteria. Retained fetal membranes dramatically increase metritis risk, with studies showing that cows retaining their placenta for more than twelve hours are four to six times more likely to develop metritis. Twins and abnormal presentations similarly increase risk through associated calving difficulties. Metabolic conditions common in early lactation, particularly hypocalcemia, ketosis, and fatty liver syndrome, compromise immune function and predispose cows to uterine infection. Negative energy balance during the transition period impairs neutrophil function and reduces the uterus's ability to clear bacterial contamination effectively.

The pathophysiology of uterine infection involves complex interactions between bacterial invasion and host immune response. Following calving, the uterus undergoes involution, a process of returning to its non-pregnant size and condition. During this period, lochia, the normal postpartum discharge containing blood, mucus, and tissue debris, provides an excellent medium for bacterial growth. In healthy cows, the innate immune system, particularly neutrophils and macrophages, effectively eliminates bacterial contamination within the first few weeks postpartum. However, when immune function is compromised or bacterial challenge overwhelms defense mechanisms, infection becomes established. The bacteria and their toxins damage the endometrium, trigger inflammatory responses, and interfere with normal uterine involution. Chronic inflammation leads to tissue damage, fibrosis, and impaired function that can permanently affect fertility even after the active infection resolves.

Early warning signs of uterine infection often appear within the first week after calving and should prompt immediate veterinary attention. Affected cows may show subtle changes in behavior and appetite before obvious clinical signs develop. Decreased feed intake, often noticed as reduced time at the feed bunk or decreased dry matter consumption, frequently precedes other symptoms. A mild fever may be present in the early stages, though it can be easily missed without routine temperature monitoring. Cows may appear slightly depressed or less alert than normal, standing apart from the herd or showing reduced interest in their surroundings. Early detection of these subtle signs allows for prompt intervention before the condition progresses to more severe disease.

Metritis typically presents with more dramatic clinical signs than endometritis due to its involvement of the entire uterine wall. The hallmark sign of metritis is a fetid, watery, reddish-brown to gray uterine discharge with a characteristically foul odor. This discharge may be visible on the tail, perineum, and hindquarters, or may be detected during vaginal examination. Affected cows usually develop a fever above 39.5 degrees Celsius (103.1 degrees Fahrenheit), though some severely compromised animals may be hypothermic. Systemic illness is common, with affected animals showing depression, dehydration, decreased rumen motility, and significant reduction in milk production. In severe cases, toxic metritis can develop, characterized by profound depression, recumbency, and signs of septicemia that can be life-threatening without aggressive treatment.

Behavioral changes associated with uterine infection reflect both the local discomfort and systemic illness. Cows with metritis often isolate themselves from the herd, seeking quiet areas and showing reluctance to move or interact with herdmates. Appetite suppression is pronounced, with affected animals showing little interest in feed even when offered palatable options. Milk production drops significantly, often by twenty to fifty percent in acute metritis cases. Affected cows may exhibit signs of abdominal discomfort, including arched backs, reluctance to lie down, or kicking at the abdomen. Reduced rumination, evidenced by fewer cud chewing cycles per day, indicates compromised gastrointestinal function secondary to the uterine infection.

Physical examination reveals several characteristic findings in cows with uterine infections. Rectal palpation discloses an enlarged, fluid-filled uterus that may be atonic or poorly contracting. The uterine wall may feel thickened and doughy in metritis cases. Vaginal examination using a speculum or gloved hand reveals the characteristic discharge, which varies from watery and reddish-brown in acute metritis to mucopurulent in endometritis. The cervix remains partially open longer than normal, and the vaginal mucosa may appear hyperemic or inflamed. External examination may reveal soiling of the perineum and tail with discharge, dehydration evidenced by skin tenting, and sunken eyes in severe cases.

Symptom progression differs between metritis and endometritis and influences treatment decisions. Acute puerperal metritis typically develops within seven to ten days of calving and progresses rapidly if untreated. Initial mild depression and reduced appetite quickly advance to obvious systemic illness with fever, profound depression, and dramatic drops in milk production. Without treatment, toxic metritis can develop within days, potentially leading to septicemia, peritonitis, or death. Clinical endometritis, by contrast, develops more gradually and presents primarily as persistent purulent vaginal discharge without systemic signs. Affected cows maintain normal temperature, appetite, and milk production but fail to conceive when bred, leading to extended days open and economic losses from reduced reproductive efficiency.

Certain emergency symptoms require immediate veterinary intervention to prevent life-threatening complications. Toxic metritis, characterized by recumbency, severe depression, cold extremities, rapid heart rate, and signs of shock, constitutes a medical emergency requiring aggressive fluid therapy and systemic antibiotics. Cows with temperatures exceeding 40.5 degrees Celsius (105 degrees Fahrenheit) or those showing signs of dehydration with skin tenting persisting for more than three seconds need urgent attention. Complete anorexia lasting more than twenty-four hours, rapid deterioration in condition, or signs of concurrent conditions such as displaced abomasum or mastitis warrant immediate veterinary evaluation. Additionally, any cow with foul-smelling discharge accompanied by systemic illness should be examined promptly, as delayed treatment significantly worsens prognosis and increases the risk of permanent reproductive damage or death.

Clinical examination forms the foundation of diagnosing endometritis and metritis in cattle. The diagnostic process begins with a thorough history, including calving date, any complications during parturition, whether fetal membranes were retained, and the progression of clinical signs. Physical examination assesses overall body condition, hydration status, temperature, heart rate, and respiratory rate to evaluate systemic involvement. Rectal palpation allows evaluation of uterine size, tone, and contents, with metritis cases typically revealing an enlarged, atonic uterus containing fluid. Vaginal examination, performed using either vaginoscopy with a speculum or manual examination with a gloved hand, permits direct visualization and characterization of uterine discharge, which is essential for distinguishing between metritis and endometritis and assessing severity.

Diagnostic testing supports clinical findings and helps guide treatment decisions. Complete blood count may reveal leukocytosis with a left shift in acute metritis, indicating active bacterial infection, though some severely affected cows show leukopenia due to overwhelming infection. Serum biochemistry can identify concurrent metabolic conditions such as hypocalcemia or ketosis that may have predisposed the cow to uterine infection. Uterine culture and sensitivity testing, while not routinely performed in field conditions, can identify specific pathogens and guide antibiotic selection in cases unresponsive to initial therapy. Ultrasound examination of the reproductive tract allows assessment of uterine fluid accumulation, wall thickness, and involution progress, and can identify complications such as uterine abscesses or adhesions.

Differential diagnosis is important because several conditions can mimic or complicate uterine infections. Retained fetal membranes without secondary metritis may cause discharge but lack the systemic illness associated with uterine infection. Vaginal or cervical lacerations from difficult calvings can produce discharge and may become secondarily infected. Pyometra, accumulation of purulent material in a closed uterus, presents differently than endometritis with a distended uterus and absence of vaginal discharge. Conditions causing postpartum illness, including displaced abomasum, traumatic reticuloperitonitis, mastitis, and pneumonia, should be considered in cows showing systemic signs, as these may occur concurrently with or be confused for metritis.

Herd-level diagnostics play an important role in managing uterine health in cattle operations. Routine postpartum examinations, ideally performed at specific intervals such as seven to fourteen days and again at thirty to forty days after calving, allow early detection of both clinical and subclinical uterine disease. Monitoring herd reproductive performance metrics, including days to first service, conception rates, and services per conception, can reveal subclinical endometritis affecting fertility. Systematic recording of metritis cases, associated risk factors, and treatment outcomes enables identification of management factors contributing to high incidence. Some operations utilize diagnostic tools such as the Metricheck device for objective assessment of vaginal discharge or endometrial cytology to identify subclinical endometritis in cows with apparently normal discharge but poor fertility.

Emergency and immediate treatment of severe metritis focuses on stabilizing the cow and addressing life-threatening complications. Toxic metritis cases require aggressive intravenous fluid therapy to correct dehydration and support cardiovascular function, often requiring large volumes of balanced electrolyte solutions administered over several hours. Anti-inflammatory medications, particularly nonsteroidal anti-inflammatory drugs such as flunixin meglumine or meloxicam, help reduce fever, alleviate pain, and counteract the effects of bacterial endotoxins. Systemic antibiotics should be initiated immediately, with broad-spectrum coverage against the gram-negative and anaerobic bacteria commonly involved. Supportive care including maintaining the cow in a comfortable, clean environment with access to fresh water and palatable feed supports recovery from systemic illness.

Medical management of metritis centers on systemic antibiotic therapy to eliminate uterine infection. Ceftiofur, available in various formulations including crystalline free acid for extended-release administration, is commonly used and effective against the major pathogens involved in uterine infections. Penicillin combined with other antibiotics provides good coverage against the mixed bacterial populations typical of metritis. Ampicillin and oxytetracycline are alternative options with appropriate spectrum of activity. Critically, all antibiotic choices must account for withdrawal times for both meat and milk, with producers maintaining accurate treatment records to ensure food safety compliance. Treatment duration typically extends for three to five days for systemic antibiotics, though extended therapy may be necessary in severe or unresponsive cases.

Intrauterine therapy represents an alternative or adjunctive approach to treating uterine infections, though its efficacy is debated. Intrauterine infusion of antibiotics, antiseptics, or other compounds directly into the uterus has been practiced for decades, but evidence supporting its effectiveness over systemic therapy alone is limited. If intrauterine treatment is employed, options include oxytetracycline solutions, cephapirin benzathine, or dilute antiseptic solutions. Intrauterine therapy may be more appropriate for clinical endometritis than acute metritis, where systemic illness necessitates systemic antibiotic administration. Care must be taken to avoid introducing additional contamination during intrauterine treatment, and withdrawal times for any intrauterine products must be observed for both milk and meat.

Supportive care complements specific antimicrobial therapy and significantly influences recovery outcomes. Ensuring adequate hydration through oral or intravenous fluids helps maintain organ function and supports the immune response. Providing high-quality, palatable feed encourages intake despite reduced appetite, and drenching with propylene glycol or other energy supplements may help address negative energy balance. Maintaining affected cows in a clean, comfortable environment with good footing and adequate bedding reduces stress and supports recovery. Monitoring for and addressing concurrent conditions such as ketosis, hypocalcemia, or displaced abomasum is essential, as these complications commonly accompany metritis and can impede recovery if left untreated.

Herd treatment protocols should be established in consultation with the herd veterinarian to ensure consistent, effective management of uterine infections. These protocols typically define criteria for identifying metritis and endometritis, specify first-line and alternative treatments based on severity, and establish guidelines for escalating therapy in unresponsive cases. Standard operating procedures should include proper technique for administering treatments, documentation requirements for treatment records, and withdrawal time management. Training farm personnel to recognize early signs of uterine infection and initiate treatment according to established protocols improves outcomes by reducing delays in therapy while ensuring appropriate antibiotic stewardship.

Treatment decisions in cattle operations must balance animal welfare with economic realities. The decision whether to treat, cull, or salvage an individual animal depends on multiple factors including the cow's value, age, genetic merit, stage of lactation, and response to initial therapy. Cows with severe metritis that respond poorly to treatment, develop complications such as peritonitis or septicemia, or have concurrent conditions affecting prognosis may be candidates for salvage slaughter after appropriate withdrawal periods. Repeated breeding failures due to chronic endometritis or permanent uterine damage may also warrant culling decisions. However, given that most cases of metritis and endometritis respond to appropriate therapy, treatment should generally be attempted before considering removal from the herd, with decisions made on an individual basis considering all relevant factors.

Recovery timeline for uterine infections varies considerably depending on severity, promptness of treatment, and individual animal factors. Cows with uncomplicated metritis treated early typically show clinical improvement within forty-eight to seventy-two hours of initiating therapy, with fever resolving and appetite returning. Complete resolution of uterine discharge may take two to three weeks as the uterus continues involution and clears residual debris. Clinical endometritis generally requires a longer treatment course, often with improvement occurring gradually over several weeks. Full reproductive recovery, measured as the ability to conceive and maintain pregnancy, may take several months as the endometrium heals and normal cyclicity resumes. Some degree of fertility impairment may persist despite clinical resolution, particularly in cows with severe or prolonged infections.

Post-treatment care and monitoring are essential to ensure complete recovery and identify complications early. Following treatment completion, cows should be monitored for recurrence of clinical signs including fever, decreased appetite, or abnormal discharge. Rectal examination at two to four week intervals allows assessment of uterine involution progress and identification of incomplete recovery. Vaginal examination should confirm resolution of purulent discharge before the voluntary waiting period ends and breeding commences. Monitoring return to estrus provides indication of ovarian function resumption, though some cows may cycle without showing obvious signs. Body condition should be assessed regularly, as cows recovering from metritis often lose condition during acute illness and may require dietary adjustments to support recovery and subsequent reproductive performance.

Prognosis for cows with uterine infections depends on several factors influencing their chance of returning to normal reproductive function. Severity of initial infection significantly impacts long-term outcomes, with toxic metritis cases having poorer prognosis than mild clinical metritis. Timeliness of treatment correlates strongly with recovery, as delays allow more extensive endometrial damage. The cow's overall health status, including metabolic condition, body condition score, and presence of concurrent diseases, influences ability to recover fully. Age and parity may also affect prognosis, with older, higher-parity cows potentially having reduced capacity for uterine repair. Generally, seventy to eighty percent of cows treated for uncomplicated metritis recover adequate fertility, though conception rates may remain below herd average for the first few breedings.

Return to production considerations guide management of recovered cows. Milk from treated cows must be withheld according to specified withdrawal periods, which vary by product and should be confirmed before returning milk to the bulk tank. Breeding should be delayed until clinical recovery is complete and sufficient time has passed for endometrial healing, typically a minimum of forty to sixty days postpartum regardless of treatment timing. Some veterinarians recommend extending the voluntary waiting period for cows recovering from metritis to improve first-service conception rates. Before breeding, confirmation of uterine health through examination and possibly ultrasound helps ensure the reproductive tract has recovered sufficiently to support pregnancy. Cows that fail to conceive after multiple services despite clinical recovery may have subclinical endometritis or permanent uterine damage warranting further diagnostics or culling consideration.

Vaccination protocols play a limited but potentially beneficial role in preventing uterine infections in cattle. While no vaccines specifically target the opportunistic bacteria causing metritis and endometritis, vaccination programs supporting overall immune function may indirectly reduce susceptibility. Vaccines against diseases that cause reproductive losses, such as bovine viral diarrhea, infectious bovine rhinotracheitis, and leptospirosis, help maintain reproductive health and may reduce abortion-related uterine infections. Some operations utilize autogenous vaccines developed from bacteria isolated from affected animals in the herd, though evidence for their efficacy in preventing metritis is limited. The primary focus of prevention should remain on management practices rather than vaccination, as the opportunistic nature of uterine infections makes direct immunization challenging.

Biosecurity measures and hygiene practices represent the most effective approach to reducing uterine infection incidence. Maintaining clean, dry, well-bedded calving areas minimizes bacterial exposure during the vulnerable periparturient period. Maternity pens should be cleaned and rebedded between calvings, with thorough disinfection performed regularly. Separating calving cows from sick animals prevents exposure to additional pathogens. Personnel assisting with calvings should practice strict hygiene, including using clean obstetrical equipment, wearing clean gloves, and using appropriate lubricants. Limiting unnecessary vaginal examinations and interventions reduces introduction of environmental bacteria into the reproductive tract. Proper disposal of placental membranes and fluids reduces environmental contamination in calving areas.

Nutritional management during the transition period significantly influences uterine health and infection risk. Maintaining adequate body condition at calving, targeting a score of 3.0 to 3.25 on a five-point scale, supports immune function without promoting metabolic disorders associated with overconditioned cattle. Transition diets should be carefully formulated to support rumen adaptation while meeting energy and protein requirements, minimizing negative energy balance in early lactation. Adequate dietary vitamin E and selenium support immune cell function and uterine involution. Calcium supplementation or prevention of hypocalcemia through dietary manipulation or oral calcium supplementation at calving reduces metritis risk by maintaining uterine tone and immune function. Avoiding excessive body condition loss in early lactation through appropriate diet formulation supports recovery and reduces infection susceptibility.

Management practices throughout the calving process influence uterine infection risk significantly. Monitoring cows closely as calving approaches allows timely intervention when assistance is needed while avoiding premature or unnecessary interference. When assistance is required, using appropriate technique, adequate lubrication, and clean equipment minimizes trauma and contamination. Prompt attention to retained fetal membranes, including monitoring affected cows closely and initiating treatment at the first sign of systemic illness, reduces progression to severe metritis. Some operations employ prophylactic treatment of high-risk cows, such as those with retained placenta or difficult calvings, though this practice should be balanced against concerns about antimicrobial stewardship. Proper training of farm personnel in calving assistance techniques and recognition of complications supports optimal management.

Quarantine and testing protocols apply primarily to preventing introduction of contagious reproductive diseases rather than opportunistic uterine infections. However, maintaining a closed herd or properly quarantining and testing incoming animals prevents introduction of pathogens such as bovine viral diarrhea virus that can compromise reproductive health. Regular herd health testing for reproductive diseases ensures early detection of any problems. Documenting and analyzing metritis cases within the herd helps identify patterns and risk factors specific to the operation. Establishing baseline incidence rates allows monitoring of prevention program effectiveness and prompts investigation when rates increase. Working with a herd veterinarian to develop and regularly review prevention protocols ensures practices remain current and effective.

Daily management and monitoring of postpartum cows form the foundation of preventing and controlling uterine infections in cattle herds. Implementing a systematic fresh cow monitoring program ensures early detection of problems before they become severe. Temperature monitoring for the first ten to fourteen days postpartum, ideally performed daily, identifies febrile cows that may be developing metritis. Assessment of feed intake, milk production, and general demeanor provides additional indicators of health status. Recording and reviewing daily observations allows identification of trends and early intervention. Personnel responsible for fresh cow care should be trained to recognize abnormal discharge, signs of systemic illness, and behavioral changes indicating health problems. Clear protocols should define when to treat, when to call for veterinary assistance, and what records to maintain.

Housing and environmental management significantly impact uterine health in cattle operations. Maternity facilities should provide adequate space, with a minimum of fourteen square meters per cow in group calving areas or individual maternity pens of at least twelve square meters. Bedding should be deep, dry, and clean, with organic materials such as straw changed frequently to minimize bacterial buildup. Adequate ventilation prevents ammonia accumulation and reduces respiratory disease that can compromise immune function. Temperature management, including cooling systems in hot climates, reduces heat stress that impairs immune response and increases metabolic demands. Fresh cow housing should similarly emphasize cleanliness, comfort, and appropriate stocking density to support recovery during the critical postpartum period.

Herd health programs should specifically address reproductive health and uterine disease prevention. Establishing routine postpartum examination schedules, typically at seven to fourteen days and again at thirty to forty days after calving, allows systematic evaluation of all cows. These examinations should assess uterine involution, presence of discharge, and overall recovery, with findings recorded for analysis. Reproductive performance monitoring, including tracking of days to first service, conception rates, and pregnancies per artificial insemination, identifies problems potentially related to subclinical endometritis. Consultation with the herd veterinarian on a regular basis, ideally monthly or more frequently, ensures ongoing evaluation of reproductive health and adjustment of protocols as needed. Participation in benchmarking programs allows comparison with similar operations and identification of areas for improvement.

Record keeping and monitoring systems enable data-driven management of uterine health. Individual cow records should document calving date and any difficulties, retained placenta occurrence, postpartum examinations and findings, treatments administered, and subsequent reproductive performance. Herd-level summaries should track metritis incidence, treatment outcomes, and fertility measures for affected versus unaffected cows. Analysis of these records identifies risk factors operating within the specific herd, such as associations with particular calving areas, seasonal patterns, or management changes. Modern dairy management software can automate much of this tracking and generate alerts when parameters exceed established thresholds. Regular review of records, ideally monthly, supports continuous improvement in uterine health management.

Economic considerations influence all aspects of uterine health management and should be explicitly evaluated. The cost of metritis extends beyond immediate treatment expenses to include milk loss during illness, extended days open, additional breedings required, and increased culling. Calculating the true cost per case in a specific operation, considering all direct and indirect expenses, provides justification for investment in prevention. Comparing treatment costs with value of recovered production helps guide individual animal treatment decisions. Evaluating return on investment for prevention measures, such as improved maternity facilities or enhanced transition cow nutrition, supports resource allocation. Working with the herd veterinarian and financial advisors to incorporate reproductive health into overall farm financial planning ensures sustainable management practices that protect both animal welfare and economic viability of the operation.

High-producing dairy breeds, particularly Holstein cattle, face elevated risk for endometritis and metritis compared to lower-producing breeds and beef cattle. The metabolic demands of high milk production create negative energy balance in early lactation that compromises immune function and delays uterine involution. Holsteins, as the predominant dairy breed globally, are most commonly affected simply due to their prevalence, but also because genetic selection for milk production has occurred alongside increased disease susceptibility. Jersey cattle, while producing less volume, have high component yields that create similar metabolic stress. Brown Swiss and other dairy breeds selected primarily for production face comparable risks. The association between milk production and uterine infection highlights the importance of transition cow management in high-producing herds.

Production type significantly influences uterine infection risk beyond breed considerations. Dairy cattle experience substantially higher metritis incidence than beef cattle, reflecting differences in management intensity, metabolic stress, and calving conditions. Within dairy systems, high-production herds face greater challenges than moderate-production operations due to more severe negative energy balance. First-lactation heifers have different risk profiles than mature cows, with some studies showing higher metritis rates in heifers while others find increased risk in older, higher-parity animals. Cows in early lactation are at peak risk regardless of lactation number, with most metritis cases occurring within the first three weeks postpartum. Beef cattle, while less commonly affected, can develop metritis particularly when calving difficulties occur or under intensive management conditions.

Genetic selection offers potential for reducing uterine disease susceptibility in cattle populations, though current selection emphasis remains limited. Heritability estimates for metritis are low but significant, suggesting genetic improvement is possible but will be slow. Some genetic evaluations now include health traits, including reproductive tract health, allowing selection for improved disease resistance. Genomic testing can identify animals carrying favorable variants for immune function and disease resistance. However, careful balance is needed to avoid compromising production traits while selecting for health. Selection for calving ease reduces dystocia and associated metritis risk. Avoiding inbreeding maintains genetic diversity and immune competence. Working with breed associations and genetic suppliers to incorporate health traits into breeding decisions supports long-term improvement in uterine health at the population level while addressing immediate risk through management practices.

Several conditions commonly co-occur with endometritis and metritis, either as predisposing factors or concurrent problems. Retained fetal membranes represent the most significant associated condition, with failure to expel placental membranes within twelve hours dramatically increasing metritis risk. Hypocalcemia, both clinical milk fever and subclinical low calcium status, impairs uterine contractility and immune function, predisposing cows to uterine infection and often occurring simultaneously. Ketosis and fatty liver syndrome, manifestations of negative energy balance and metabolic stress, compromise immune response and frequently accompany metritis in early lactation. Displaced abomasum commonly develops in cows with metritis, likely due to reduced feed intake and digestive dysfunction. Mastitis may occur concurrently, as the same immune compromise affecting uterine health also increases susceptibility to mammary infection.

Differential diagnosis requires distinguishing metritis and endometritis from conditions with similar presentations. Pyometra, accumulation of purulent material in a closed cervix, differs from endometritis in the absence of vaginal discharge and presence of a persistent corpus luteum maintaining the closed state. Mucometra, fluid accumulation without infection, appears similar on palpation but lacks the purulent discharge and systemic signs of uterine infection. Vaginitis and cervicitis can produce discharge that may be mistaken for endometritis but originate from different anatomic locations. Postpartum hemorrhage or hematoma formation may cause bloody discharge distinct from the fetid discharge of metritis. Other causes of postpartum fever, including pneumonia, mastitis, and traumatic reticuloperitonitis, must be considered in systemically ill fresh cows.

Complications and sequelae of uterine infections can significantly impact long-term health and productivity. Peritonitis may develop if infection spreads beyond the uterus, particularly when uterine wall integrity is compromised by severe inflammation or trauma. Adhesions between the reproductive tract and surrounding structures can form during healing, potentially causing chronic pain or mechanical interference with fertility. Chronic endometritis or pyometra may develop if acute infections are inadequately treated or fail to resolve. Ovarian dysfunction, including cystic ovarian disease, can follow uterine infection due to disruption of normal reproductive hormone patterns. Infertility or subfertility may persist even after clinical resolution of infection due to permanent endometrial damage or scarring. In severe cases, particularly with delayed or inadequate treatment, septicemia and death represent the most serious potential outcomes of uterine infection in cattle.