Prolapsed Uterus

Uterine prolapse represents one of the most dramatic and serious reproductive emergencies in cattle and other livestock species, occurring when the entire uterus turns inside out and protrudes through the vulva following parturition. This complete eversion of the uterus typically happens within hours of calving, while the cervix remains dilated and uterine tone is diminished, creating conditions that allow the organ to be expelled under the influence of continued straining. The condition requires immediate veterinary attention, as delays in treatment dramatically increase the risks of shock, hemorrhage, infection, and death.

Uterine prolapse affects cattle, sheep, goats, and pigs, with cattle being the most commonly affected species in veterinary practice due to their larger size and the economics of beef and dairy production that justify treatment costs. The condition occurs sporadically in most herds, with reported incidence rates generally ranging from less than one percent to approximately three percent of calvings, though individual herds may experience higher rates when predisposing factors are present. Both dairy and beef cattle are affected, with some studies suggesting slightly higher incidence in beef breeds and in cows kept under extensive management conditions.

The welfare impact of uterine prolapse is severe, as affected animals experience significant pain and distress, and the exposed organ suffers progressive damage from drying, trauma, contamination, and swelling that worsens the longer treatment is delayed. The cardiovascular consequences of prolapse can be life-threatening, with hypovolemic shock developing as blood pools in the prolapsed organ and systemic circulation is compromised. Contamination of the exposed uterine tissue with manure, bedding, and environmental bacteria sets the stage for severe infection if the organ is not cleaned and replaced promptly.

Despite the severity of the condition, prognosis for survival is generally good when uterine prolapse is recognized quickly and treated appropriately by an experienced veterinarian. Successful replacement of the uterus and adequate post-treatment care result in survival rates exceeding eighty percent in most case series. Future fertility is preserved in many successfully treated animals, though some cows experience repeat prolapse in subsequent calvings or develop complications that affect breeding. Understanding the risk factors and recognizing the condition immediately allow for the rapid response that is essential for successful outcomes.

The primary cause of uterine prolapse is the combination of continued straining by the cow after delivery of the calf with a relaxed, dilated cervix and atonic uterus that has not yet begun the normal process of involution. Under these conditions, powerful abdominal contractions can push the uterus through the cervix and out through the vulva, causing the organ to turn completely inside out as it emerges. The caruncular surface of the uterus, which forms the attachment points for the placenta during pregnancy, becomes the outer surface of the prolapsed mass, giving it a characteristic bumpy appearance.

Dystocia and difficult calving are major predisposing factors for uterine prolapse, as the excessive straining required to deliver a calf during difficult birth continues afterward and may push out the uterus. Forced extraction of calves, particularly when excessive force is used or when the calf is pulled before adequate cervical dilation, increases the risk of prolapse. Oversized calves, malpresentations requiring correction, and inadequate lubrication during assisted delivery all contribute to prolonged and difficult calvings that predispose to subsequent prolapse. The trauma associated with difficult birth may also impair normal uterine tone and involution.

Hypocalcemia plays a significant role in predisposing cattle to uterine prolapse by causing decreased smooth muscle tone throughout the body, including the uterus. Subclinical or clinical milk fever around the time of calving results in diminished uterine contractility that allows the organ to be displaced more easily during straining. Cows that experience recumbency from hypocalcemia are at particular risk, as the combination of metabolic derangement and the physical position creates ideal conditions for prolapse. Prevention and prompt treatment of hypocalcemia are important components of prolapse prevention.

Management and environmental factors contribute to prolapse risk through various mechanisms. Slippery or sloped flooring in calving areas can cause cows to position themselves in ways that facilitate uterine prolapse when straining. Inadequate nutrition during late pregnancy may compromise the tissue integrity and muscle tone needed to retain the uterus. Excessive body condition can be associated with difficult calvings that predispose to prolapse. Poor calving supervision that allows protracted labor or delays in addressing dystocia increases risk. Multiple studies have found associations between specific management factors and prolapse incidence that vary between operations.

The pathophysiology of uterine prolapse involves the mechanical displacement of an organ that normally begins contracting and involuting immediately after parturition. When uterine tone is compromised and straining continues, the relatively heavy gravid horn tips forward and begins to evert through the body of the uterus. The weight of the everting tissue creates traction that pulls additional uterine tissue through the cervix, creating a self-perpetuating process that rapidly results in complete eversion of the entire organ. Once prolapsed, the uterus quickly becomes congested and edematous as venous return is impaired, and the exposed tissue is vulnerable to desiccation, trauma, and bacterial contamination that worsen the animal's condition with each passing hour.

The symptoms of uterine prolapse are dramatic and unmistakable, with the affected cow presenting with a large mass of tissue protruding from the vulva that can extend to the level of the hocks or even touch the ground in severe cases. The prolapsed uterus appears as a reddish-pink to red mass when fresh, with the characteristic cobblestone appearance created by the caruncles or maternal attachment sites that covered the internal surface during pregnancy. The mass is typically covered with remnants of fetal membranes if the placenta was not yet completely passed at the time of prolapse, and may be contaminated with blood, manure, and bedding material.

Early recognition of uterine prolapse is essential for successful treatment, and producers should be alert for signs of impending or early prolapse during the hours following calving. Continued straining after calf delivery, with repeated forceful abdominal contractions, suggests the cow may be at risk for prolapse. Visualization of red tissue beginning to protrude from the vulva represents the earliest stage of prolapse and warrants immediate veterinary attention before complete eversion occurs. Some cows may be found standing with the uterus prolapsed, while others are recumbent with the organ resting on the ground behind them.

Behavioral changes in cows with uterine prolapse reflect the pain, shock, and metabolic derangement associated with the condition. Affected animals often show signs of discomfort including arched back, reluctance to move, frequent shifting of weight, and abnormal positioning. They may appear anxious and show increased respiratory rate. Reduced interest in their calf and failure to engage in normal maternal behavior may be observed. As the condition progresses and shock develops, cows become increasingly depressed and weak, eventually becoming recumbent if they were not already down.

Physical signs beyond the obvious prolapsed mass include progressive deterioration of the exposed uterine tissue over time. Initially pink and moist, the uterus becomes darker, drier, and more edematous as hours pass without treatment. Swelling can be dramatic, with the organ increasing substantially in size from fluid accumulation. The surface may become lacerated from contact with the ground, bedding, or the cow's own feet if she attempts to rise. Severe contamination with manure, dirt, and debris is common in cows found recumbent in dirty environments. Hemorrhage from torn blood vessels may be visible.

Systemic signs of shock develop as the condition progresses without treatment. Tachycardia with weak peripheral pulses indicates cardiovascular compromise. Cold extremities suggest poor peripheral perfusion. Pale or muddy mucous membranes reflect developing shock. Subnormal body temperature is common, particularly in cows with concurrent hypocalcemia or those exposed to cold environmental conditions. Weakness progressing to recumbency and inability to rise indicates severe deterioration requiring the most urgent intervention.

Emergency symptoms that demand immediate veterinary response include any prolapsed uterus, as all cases represent true emergencies regardless of apparent severity. However, certain presentations indicate particularly critical status: severe hemorrhage with blood pooling or active bleeding, signs of profound shock with collapse and minimal responsiveness, very dark or black discoloration of uterine tissue suggesting vascular compromise, extensive traumatic damage to the prolapsed organ, and concurrent conditions such as severe hypocalcemia causing complete recumbency. These cases require the fastest possible response for any chance of survival.

Clinical diagnosis of uterine prolapse is straightforward in most cases, as the condition presents with obvious external signs that are virtually unmistakable when a large mass of tissue is protruding from the vulva of a recently calved cow. The characteristic appearance of the everted uterus, with its caruncular surface exposed and any remaining fetal membranes attached, allows immediate recognition without the need for sophisticated diagnostic testing. The primary diagnostic challenge is not identifying the prolapse itself but rather assessing the severity of associated complications and the overall status of the animal to guide treatment decisions.

Physical examination of the cow with uterine prolapse should assess both the condition of the prolapsed organ and the systemic status of the animal. Evaluation of the uterus includes assessment of tissue color and viability, degree of edema and swelling, extent of contamination and trauma, and presence of the placenta either attached or separately. Examination of the cow includes evaluation of cardiovascular status through heart rate, pulse quality, mucous membrane color, and capillary refill time. Temperature measurement helps identify hypothermia or fever. Assessment of the cow's strength and ability to rise influences decisions about positioning for replacement. Determination of concurrent hypocalcemia through clinical signs or blood calcium measurement guides supportive therapy.

Differential diagnosis is rarely challenging for complete uterine prolapse given its distinctive presentation. Vaginal prolapse, which can occur before calving as well as afterward, involves protrusion of vaginal tissue only and can be distinguished by the smooth appearance and absence of caruncles on the prolapsed tissue. Incomplete uterine prolapse or partial eversion may present as tissue visible within the vagina without complete external protrusion. Rarely, prolapse of the bladder through a ruptured vaginal wall could create diagnostic confusion, though the smooth surface and presence of urine would help differentiate this condition.

Pre-treatment assessment is critical for planning successful replacement and anticipating complications. Large, severely edematous organs will be more difficult to replace and may require more aggressive efforts to reduce swelling before or during replacement. Extensively traumatized or contaminated uteri may require more thorough cleaning. Assessment of the cervix through palpation determines whether adequate dilation remains for replacement or whether time has allowed significant closure that will complicate the procedure. Identification of concurrent conditions including hypocalcemia, injuries from calving, or other illness helps ensure comprehensive treatment.

Treatment of uterine prolapse is a veterinary emergency requiring prompt intervention by a skilled practitioner to replace the organ, address complications, and implement supportive care to maximize survival and future fertility. Successful treatment depends on the speed of intervention, the condition of the prolapsed organ, the overall status of the cow, and the skill of the treating veterinarian. While the basic principles of prolapse treatment are consistent, specific techniques may vary based on individual case circumstances and practitioner experience.

Emergency stabilization of the cow begins before or concurrent with efforts to replace the uterus. If the animal is standing, efforts should be made to keep her standing throughout the procedure, as the standing position facilitates replacement. If recumbent, positioning with hindquarters elevated helps reduce abdominal pressure during replacement. Intravenous fluid therapy addresses hypovolemia and shock. Calcium supplementation treats or prevents hypocalcemia that commonly accompanies prolapse. Pain management with appropriate analgesics improves animal welfare and may reduce straining that complicates replacement. Epidural anesthesia is commonly administered to eliminate straining during the replacement procedure.

Preparation of the prolapsed uterus for replacement involves thorough cleaning and careful handling to minimize additional trauma. The organ should be cleansed with warm water or dilute antiseptic solution to remove gross contamination, fetal membranes if still attached, and debris. Cold water should be avoided as it may cause additional discomfort and vasoconstriction. Gentle handling prevents additional damage to compromised tissues. Hypertonic solutions such as sugar or concentrated saline may be applied to reduce edema if swelling is severe, though opinions vary regarding this practice. Any obviously necrotic tissue or areas of concern should be noted for later evaluation.

Manual replacement of the uterus requires patience, adequate assistance, and appropriate technique to avoid complications. The organ is supported at the level of the vulva to prevent traction on attachments while being gradually pushed back through the vagina and cervix. Beginning with the portion nearest the vulva and working outward helps ensure proper orientation during replacement. Steady pressure rather than forceful pushing reduces the risk of rupture. Once the body of the uterus has passed through the cervix, the horns must be completely everted back to normal orientation using a fist or closed bottle passed into each horn. Ensuring complete replacement including the tips of both horns is critical to prevent recurrence.

Retention measures help prevent immediate reprolapse while the cervix closes and uterine tone returns. Options include vulvar sutures placed in various patterns to physically narrow the vulvar opening, Buhner suture or similar buried retention sutures, and in some cases temporary internal devices. The choice of retention method depends on practitioner preference and individual case factors. Systemic oxytocin administration promotes uterine contraction and involution. Intrauterine antimicrobial therapy addresses bacterial contamination. Prostaglandin administration may assist with uterine involution. Retention sutures are typically removed after several days to several weeks depending on the technique used.

Post-replacement care determines survival and long-term outcomes. Continued supportive therapy including fluids, calcium supplementation, and anti-inflammatory drugs addresses ongoing metabolic derangement and promotes recovery. Systemic antimicrobial therapy combats infection from contamination. Monitoring for complications including reprolapse, hemorrhage, infection, and deterioration requires careful observation over the following days. Tetanus prophylaxis should be ensured. The cow should be kept in a clean, dry environment and observed for return to normal eating, drinking, and behavior patterns.

Recovery from uterine prolapse following successful replacement depends on the degree of tissue damage sustained before treatment, the development of complications, and the overall health status of the cow. Initial recovery over the first several days focuses on stabilization and resolution of acute metabolic and inflammatory effects. The cow should gradually return to normal appetite, rumination, and milk production if lactating. Signs of systemic illness including fever, depression, or deteriorating condition warrant immediate veterinary reassessment and intervention.

Post-treatment monitoring should continue for at least two weeks following prolapse replacement, with particular attention to signs of complications. Reprolapse remains a risk until the cervix has fully closed and uterine involution is well established, typically requiring seven to fourteen days. Metritis can develop from bacterial contamination of the uterus and manifests as foul-smelling vaginal discharge, fever, depression, and reduced appetite. Peritonitis from uterine rupture during prolapse or replacement is a serious complication causing severe illness and often death. Vascular thrombosis and tissue necrosis can occur in severely damaged uteri. Regular temperature monitoring and observation for abnormal vaginal discharge help detect developing complications early.

Prognosis for survival following properly treated uterine prolapse is generally good, with success rates of eighty percent or higher reported in most case series when treatment is timely and appropriate. Factors associated with poorer prognosis include prolonged delay before treatment, severe tissue damage or necrosis, concurrent serious illness, and development of complications. Older cows and those with hypocalcemia may face somewhat higher risk. The skill and experience of the treating veterinarian influences outcomes, as proper technique minimizes additional trauma during replacement.

Fertility following recovery from uterine prolapse varies in published reports, with some studies finding normal conception rates and others documenting reduced fertility. Factors influencing subsequent reproductive performance include the degree of uterine damage, development of intrauterine adhesions or scarring, completeness of uterine involution, and presence of chronic endometritis. Many successfully treated cows become pregnant and carry subsequent calves to term. However, the risk of repeat prolapse in future calvings is elevated, with recurrence rates reported from five to thirty percent depending on the population studied. Owners should be aware of this risk and prepared for immediate intervention during subsequent calvings.

Prevention of uterine prolapse centers on minimizing the predisposing factors that combine to allow uterine eversion in the immediate postpartum period. While not all cases can be prevented, attention to calving management, metabolic health, and environmental factors can substantially reduce the incidence of this serious condition. Implementation of comprehensive prevention strategies is particularly important in herds that have experienced multiple prolapse cases, suggesting the presence of modifiable risk factors.

Calving management practices significantly influence prolapse risk. Appropriate timing of assistance during dystocia prevents both the prolonged straining that results from unassisted difficult birth and the trauma associated with premature or excessive intervention. Adequate training of personnel who assist with calvings ensures proper technique. Use of appropriate equipment and adequate lubrication minimizes birth canal trauma. Avoiding excessive traction and never using mechanical calf pullers without veterinary supervision reduces calving-related injuries. Allowing adequate time for cervical dilation before intervention prevents forcing calves through inadequately prepared birth canals.

Nutritional management during late gestation and the transition period influences prolapse risk through effects on metabolic health, body condition, and calf size. Avoiding excessive energy intake during late pregnancy prevents oversized calves that increase dystocia risk. Appropriate mineral and vitamin supplementation supports metabolic health around calving. Specific attention to calcium, magnesium, and phosphorus nutrition reduces the risk of hypocalcemia and associated uterine atony. Preventing excessive body condition while ensuring adequate reserves supports normal calving and postpartum metabolism.

Hypocalcemia prevention is particularly important given the strong association between low blood calcium and uterine prolapse. Dietary management strategies including appropriate calcium restriction during the dry period, use of anionic diets to improve calcium mobilization at calving, and ensuring adequate magnesium and vitamin D status all contribute to maintaining blood calcium around parturition. Prompt treatment of cows showing early signs of hypocalcemia prevents progression to recumbency and associated complications. Prophylactic calcium supplementation at calving may be appropriate in high-risk animals or herds with elevated milk fever incidence.

Environmental and facility considerations include provision of appropriate calving areas with good footing, adequate space, and cleanliness. Non-slip surfaces prevent cows from positioning themselves on slopes or slippery areas that increase prolapse risk during straining. Clean, dry bedding reduces contamination if prolapse does occur. Adequate lighting and facilities for observation allow early detection of calving problems and any prolapse that develops. Shelter from extreme weather conditions reduces environmental stress around calving.

Daily management of cattle during the periparturient period should include systematic observation protocols designed to detect calving progress and identify complications including uterine prolapse as early as possible. Pregnant animals approaching calving should be moved to designated calving areas where they can be monitored more closely than in the general herd. Observation frequency should increase as signs of imminent calving develop, with checks at least every few hours for animals in early labor. The critical hours immediately following calving represent the highest risk period for prolapse, warranting continued close observation rather than immediate return of cows and calves to the general herd.

Housing and facility management for the calving period influences both prolapse risk and outcomes if prolapse occurs. Calving areas should provide solid, non-slip footing that allows cows to position themselves normally during labor and the postpartum period. Adequate space prevents crowding stress and allows individual attention to calving animals. Cleanliness of calving areas reduces contamination of any prolapsed tissue. Good drainage prevents accumulation of moisture that contributes to slippery conditions and bacterial contamination. Access for vehicles allows rapid transport of animals requiring veterinary care.

Herd health programs should integrate prolapse prevention into broader transition cow management protocols. Body condition scoring throughout the production cycle identifies animals at risk from excessive condition at calving. Monitoring of dry cow nutrition ensures appropriate energy intake and mineral status. Vaccination programs that prevent diseases associated with abortion or weak calves reduce dystocia risk. Breeding decisions that consider calving ease genetics minimize oversized calves and difficult births. Regular veterinary consultation helps identify herd-specific risk factors and develop targeted prevention strategies.

Record keeping for reproductive events should document all prolapse cases along with relevant details that allow analysis of risk factors and outcomes. Records should include the date and time of calving and prolapse discovery, calving ease score and any assistance provided, treatment administered, outcome including survival and any complications, and subsequent reproductive performance of surviving animals. Analysis of records over time can identify patterns suggesting specific risk factors in individual herds. Comparison of prolapse incidence before and after management changes helps evaluate prevention strategies.

Economic considerations for prolapse management include both the direct costs of treatment and indirect costs of animal loss or reduced productivity. Veterinary fees for emergency prolapse treatment can be substantial, particularly for cases requiring extended procedures or aftercare. Mortality in untreated or unsuccessfully treated cases represents complete loss of animal value. Surviving animals may have reduced milk production during recovery and potentially compromised future fertility. Replacement costs for animals that die or require culling add to losses. Investment in prevention through improved facilities, nutrition, and calving management should be evaluated against expected reduction in prolapse incidence and associated losses.

Uterine prolapse occurs across all breeds of cattle, though some studies have suggested variation in incidence between breeds and production types. Research findings have been inconsistent, with some studies reporting higher rates in beef cattle while others find no significant breed differences. Hereford cattle have been identified as potentially having elevated risk in some North American studies, though this finding has not been universal. The inconsistency of breed associations across studies suggests that management factors and individual predisposing conditions may be more important than genetic breed characteristics in determining prolapse risk.

Production type considerations may influence apparent breed associations with uterine prolapse. Beef cattle managed in extensive systems may experience higher rates because difficult calvings are less likely to receive timely assistance, and the resulting prolonged straining predisposes to prolapse. Conversely, intensive dairy management with routine calving assistance might either reduce risk through prompt intervention or potentially increase risk if excessive or premature traction is applied. Dual-purpose breeds and cattle managed under varying systems may show different patterns depending on specific management practices rather than inherent genetic susceptibility.

Genetic selection against prolapse is difficult because the condition is relatively rare and influenced by many environmental factors, making heritability estimates unreliable. Selection for calving ease traits that reduce dystocia would be expected to indirectly reduce prolapse risk by decreasing the primary predisposing factor of difficult birth. Avoiding inbreeding and maintaining genetic diversity supports overall health and fitness. Individual animals that have experienced prolapse face elevated risk of recurrence, and producers may choose not to retain such animals for breeding even if successfully treated. However, the environmental nature of most risk factors means that daughters of affected cows do not necessarily face elevated risk if management factors are optimized.

Uterine prolapse shares risk factors and commonly occurs alongside other periparturient conditions that reflect the metabolic and physical challenges of calving. Hypocalcemia or milk fever is the most strongly associated condition, with low blood calcium impairing smooth muscle function throughout the body including the uterus. Cows with clinical or subclinical hypocalcemia around calving face substantially elevated prolapse risk, and calcium status should always be assessed and addressed in prolapse cases. Ketosis and fatty liver disease indicate metabolic stress that may contribute to abnormal periparturient function.

Dystocia and its complications frequently precede or accompany uterine prolapse. Retained placenta occurs more commonly following difficult calvings and may be present when prolapse occurs. Metritis developing from contamination during difficult birth or prolapse represents a serious complication requiring treatment. Vaginal and cervical injuries from calving trauma may be identified when examining prolapse cases. These related conditions often require concurrent management and influence overall prognosis. The presence of multiple periparturient problems suggests underlying risk factors such as nutritional deficiencies, inadequate transition management, or environmental stressors that warrant investigation.

Vaginal prolapse, while anatomically distinct from uterine prolapse, shares some predisposing factors and represents an important differential diagnosis. Prepartum vaginal prolapse involves protrusion of vaginal tissue before calving due to increased intra-abdominal pressure combined with relaxation of pelvic ligaments and perivaginal tissues. This condition does not involve uterine eversion and is managed differently, though severe prepartum vaginal prolapse can predispose to subsequent uterine prolapse after calving. Postpartum vaginal prolapse without uterine involvement also occurs and requires differentiation from complete uterine prolapse to guide appropriate treatment.