Prolapsed Uterus

Uterine prolapse is a serious reproductive emergency in cattle that occurs when the uterus turns inside out and protrudes through the vagina and vulva following calving. This condition represents a true veterinary emergency requiring immediate professional attention, as delays in treatment significantly reduce the probability of successful resolution and survival. The prolapsed uterus typically appears as a large, reddish mass hanging from the vulva, with the characteristic button-like caruncles visible on its surface. Without prompt treatment, the exposed uterine tissue becomes contaminated, swollen, and traumatized, leading to shock, hemorrhage, and death.

Uterine prolapse occurs in cattle worldwide and affects both dairy and beef breeds, though incidence rates vary considerably among populations and management systems. Most studies report incidence rates between 0.1 and 1.0 percent of calvings, though individual herds may experience higher rates during problem periods. The condition occurs almost exclusively during the first few hours after calving, when the cervix remains dilated and the uterus is particularly relaxed and vulnerable to inversion. Rarely, prolapse may occur during late pregnancy or delayed until 24 to 48 hours postpartum, but these presentations are exceptional.

The economic and welfare impact of uterine prolapse is significant at both the individual animal and herd levels. The emergency nature of the condition requires immediate veterinary attention, generating substantial treatment costs. Without successful treatment, the cow will die, representing loss of her genetic value, future production, and the investment in her raising and development. Even with successful replacement, some cows experience reduced subsequent fertility or require culling due to complications. The severe discomfort and life-threatening nature of untreated prolapse also creates significant animal welfare concerns that demand prompt intervention.

Uterine prolapse is treatable with excellent success rates when addressed promptly by a veterinarian with appropriate skills and facilities. Success rates exceeding 90 percent have been reported when treatment is initiated within a few hours of occurrence and the uterine tissue remains in relatively good condition. The treatment involves cleaning the prolapsed organ, reducing any swelling, manually replacing the uterus into its normal position, and retaining it in place while the cervix closes. With proper aftercare, most cows can recover fully and return to productive breeding status, though some may require an extended recovery period before rebreeding.

The primary cause of uterine prolapse is the combination of a relaxed, recently emptied uterus and continued straining following calf delivery. The immediate postpartum period represents a unique window of vulnerability when the cervix remains fully dilated and the uterus has lost the support provided by the fetus and fetal fluids. Forceful abdominal straining at this time can push the uterine wall through the cervix and vagina, causing the organ to turn inside out as it exits the vulva. The exact trigger for this inappropriate straining varies among cases but often involves continued discomfort, retained membranes, or incomplete delivery.

Hypocalcemia, commonly known as milk fever, is one of the most important predisposing factors for uterine prolapse in cattle. Low blood calcium levels cause muscle weakness including reduced uterine and abdominal muscle tone, while simultaneously contributing to continued straining. Dairy cattle are particularly susceptible to periparturient hypocalcemia due to the enormous calcium demands of colostrum and milk production. Subclinical hypocalcemia, where calcium levels are reduced but insufficient to cause obvious milk fever signs, may predispose to prolapse without the cow showing classical hypocalcemia symptoms. Managing calcium status around calving is an important preventive measure.

Dystocia and assisted delivery significantly increase the risk of uterine prolapse. Difficult deliveries result in greater trauma and stretching of the reproductive tract, exhaustion of the cow, and often continued discomfort and straining following delivery. Excessive traction during assisted delivery, particularly if applied inappropriately, can traumatize tissues and contribute to prolapse risk. Fetotomy or cesarean section for extremely difficult deliveries also increases risk. Proper obstetrical technique and appropriate timing and force of assistance help minimize these complications.

Other risk factors for uterine prolapse include excessive relaxation of pelvic ligaments, older age, poor body condition, and possibly genetic predisposition. Hormonal changes at calving cause relaxation of the ligaments supporting the reproductive tract, and excessive relaxation can contribute to prolapse. Older cows with multiple previous calvings may have reduced pelvic support structure integrity. Cows in poor body condition lack muscle mass to support the reproductive tract and resist straining. While no specific genes have been identified, familial patterns of prolapse suggest some genetic influence on predisposition.

The pathophysiology of uterine prolapse involves inversion and eversion of the organ through the dilated cervix and vulva. As the cow strains, the uterine wall is pushed outward, beginning at the tip of the formerly pregnant horn. The organ progressively turns inside out as more tissue is expelled until the entire uterus hangs outside the body. The broad ligaments containing the uterine blood vessels are stretched as the organ everts. Once prolapsed, the tissue becomes contaminated with bedding and environmental debris, begins to swell due to compromised venous drainage, and is subject to trauma. The stretched blood vessels may hemorrhage, and the exposed tissue quickly becomes compromised without treatment.

The most obvious and unmistakable symptom of uterine prolapse is the presence of a large, dark red to pink mass protruding from the vulva and hanging down toward or reaching the ground. This mass is the inverted uterus, and its size typically ranges from that of a large watermelon to even larger depending on the degree of swelling and the size of the cow. The surface of the prolapsed organ displays the characteristic caruncles, the mushroom-shaped structures that formed the maternal side of the placental attachment, which appear as button-like protrusions across the uterine surface. In fresh prolapses, the tissue appears red, glistening, and relatively healthy, while older prolapses become swollen, dark, dry, and contaminated.

The timing of discovery is critical for symptom recognition and prognosis. Prolapses discovered within the first few hours of occurrence, when the tissue is still fresh and relatively undamaged, have the best prognosis for successful treatment. Producers who check calving cows frequently are most likely to discover prolapses early. Signs that a prolapse is fresh include bright red coloration, minimal swelling, intact tissue without tears or necrosis, and a cow that remains relatively alert and stable. As time passes, the tissue progressively deteriorates.

Behavioral signs in cows with uterine prolapse include continued straining and attempts to expel the mass, restlessness, discomfort evidenced by kicking at the abdomen, and eventually weakness and collapse as shock develops. Early in the condition, affected cows may attempt to stand and walk despite the prolapse, sometimes causing further trauma to the protruding organ. As the condition progresses and the cow loses blood and develops shock, she becomes increasingly weak, depressed, and eventually recumbent. The continued straining that often occurs can make treatment more difficult.

Physical signs beyond the obvious prolapse include varying degrees of hemorrhage, contamination of the tissue with bedding, manure, and dirt, progressive swelling of the exposed organ, and eventually signs of shock. Hemorrhage may occur from torn vessels within the organ or at its surface, and blood loss can be substantial. The exposed tissue rapidly becomes edematous as venous drainage is compromised, sometimes doubling or tripling in size within hours. The cow may become pale, have a rapid weak pulse, show cold extremities, and demonstrate other signs of circulatory shock.

Progression of symptoms in untreated uterine prolapse follows a predictable pattern of deterioration. Initially, the tissue is viable and the cow is stable, representing the optimal time for treatment. Within hours, progressive swelling, contamination, and tissue damage reduce the likelihood of successful replacement. The cow becomes increasingly weak as blood loss and shock progress. Necrosis of tissue begins at the tips of the exposed organ and spreads. Without treatment, death typically occurs within 24 to 48 hours from a combination of hemorrhage, shock, and sepsis, though some cows survive longer in a deteriorated state.

Emergency symptoms requiring immediate veterinary intervention include the prolapse itself, as this is always an emergency regardless of its appearance. Additionally, active hemorrhage visible as bleeding from the organ, profound weakness or collapse of the cow, signs of shock including rapid breathing and pale gums, and extensive tissue damage or necrosis all indicate critical situations. While all prolapses require urgent attention, these findings indicate that treatment must proceed as rapidly as possible to have any chance of success.

Clinical examination and diagnosis of uterine prolapse is straightforward, as the condition presents with an obvious and unmistakable physical appearance. The large mass of tissue protruding from the vulva displaying caruncles on its surface is diagnostic. The veterinarian will assess the condition of the prolapsed tissue, looking for viability indicators including color, texture, presence of necrosis, and extent of contamination and trauma. Examination of the cow includes assessment of vital signs to evaluate her stability and identify shock. The presence and position of the placenta is noted, as retained membranes may need to be removed before replacement.

Differential diagnosis for the mass itself is rarely necessary since the appearance is distinctive. However, vaginal prolapse, which can occur during late pregnancy, should be distinguished from uterine prolapse, which occurs after calving. In vaginal prolapse, the vaginal wall protrudes but the uterus remains in place, and caruncles are not visible on the surface. Rectal prolapse presents as a darker, tube-like protrusion from the anus rather than the vulva. In rare cases of extensive vaginal tears or lacerations, intestines may protrude, requiring differentiation and very different management.

Assessment of the prolapsed organ's condition is critical for treatment planning and prognosis. Fresh, viable tissue appears red to pink with a glistening surface and intact caruncles. Swelling is a normal finding but excessive edema complicates replacement. Contamination with dirt and bedding must be addressed during treatment. Tears or lacerations in the tissue are noted and their significance assessed. Dark, dry, or blackened tissue indicates necrosis that may make salvage impossible. The extent and location of any hemorrhage is evaluated.

Herd-level diagnostics may be warranted when multiple prolapses occur within a herd, suggesting a common predisposing factor. Evaluation of the calving management program, calcium supplementation protocols, and incidence of hypocalcemia and dystocia may identify correctible factors. Blood calcium testing of at-risk cows around calving can reveal subclinical hypocalcemia. Review of breeding decisions may identify sires whose offspring are prone to causing dystocia. Analyzing the circumstances surrounding each prolapse case helps identify patterns and potential interventions.

Emergency treatment of uterine prolapse must begin immediately upon discovery to maximize the chance of successful resolution. The first priority is preventing further trauma to the prolapsed organ. If the cow is standing, attempts should be made to keep her quiet and prevent her from moving around and dragging the prolapse through debris. If she is recumbent, positioning her with her hindquarters slightly elevated relative to her front can reduce continued prolapse and facilitate replacement. The prolapsed organ should be protected by wrapping it in a clean, damp towel or sheet while awaiting veterinary arrival.

The definitive treatment is manual replacement of the uterus by a veterinarian. This procedure begins with thorough cleaning of the prolapsed organ using large volumes of clean, warm water with mild antiseptic solution to remove all contamination. The placenta is carefully removed if still attached, taking care to separate it from the caruncles without tearing uterine tissue. Hypertonic solutions such as concentrated sugar or salt may be applied to help reduce edema and shrink the swollen tissue. Elevation of the organ above the level of the vulva using a clean sheet or tray also helps reduce swelling through gravity drainage.

Epidural anesthesia is typically administered to eliminate straining during the replacement procedure. This anesthesia blocks the spinal nerves controlling the abdominal muscles and eliminates the straining reflex that otherwise works against replacement attempts. The cow may be sedated as well if she is fractious or distressed. With anesthesia in place and the organ cleaned and size-reduced, replacement proceeds by starting at the portion of the uterus nearest the vulva and progressively pushing the tissue back through the vagina. Steady, gentle pressure with the flat of the hands moves the tissue inward while avoiding puncturing the organ with fingers.

Once the uterus is replaced, it must be fully repositioned with both horns restored to normal position within the abdominal cavity. Incompletely replaced uteri are prone to immediate reprolapse. The veterinarian typically introduces an arm fully into the replaced uterus to ensure complete eversion and proper positioning of both horns. Infusion of warm saline or dilute antiseptic solution helps distend the organ and confirm proper positioning. Prophylactic antibiotics and anti-inflammatory medications are typically administered. Oxytocin may be given to promote uterine contraction.

Retention methods to prevent reprolapse are often employed following replacement. Options include vulvar sutures placed in various patterns to narrow the vulvar opening while allowing drainage and urination, or commercial retention devices that accomplish similar purposes. A truss or rope harness may be applied externally in some cases. Systemic calcium supplementation addresses underlying hypocalcemia that predisposes to continued straining. The cow is monitored closely for the first 24 to 48 hours for any signs of reprolapse, which would require repeat treatment.

Treatment decision factors include the condition of the prolapsed tissue, the stability of the cow, the availability of veterinary assistance, and the value of the animal. Fresh prolapses in stable cows have excellent prognosis with prompt treatment and warrant aggressive intervention. Older prolapses with extensive tissue damage may be unsalvageable, and euthanasia may be more appropriate than attempting replacement. Severely compromised cows in shock may not survive treatment, and stabilization should proceed alongside or before replacement attempts. Economic considerations rarely override the immediate welfare imperative to either treat or euthanize promptly.

Recovery timeline following successful uterine prolapse treatment varies depending on the degree of tissue trauma, presence of complications, and the cow's overall condition. In uncomplicated cases treated promptly, the cow typically shows significant improvement within 24 to 48 hours, with reduced straining, improved appetite, and return to relatively normal behavior. Complete uterine involution takes the normal four to six weeks. Full recovery allowing consideration of rebreeding may require 60 to 90 days or more, and some veterinarians recommend skipping one breeding season to allow complete healing.

Post-treatment care involves continued monitoring for reprolapse, which is most likely in the first few days while the cervix remains dilated. The vulvar sutures or retention device remains in place for several days until the risk of reprolapse has passed, then is removed to allow normal drainage. Antibiotic therapy continues for the duration prescribed by the veterinarian, typically five to seven days. Pain management with anti-inflammatory medications supports comfort during recovery. The cow should be housed in a clean, dry environment with easy access to feed and water.

Prognosis factors for recovery include the promptness of treatment, the condition of the tissue at treatment, whether complications such as hemorrhage or infection develop, and the overall health status of the cow. Prolapses treated within a few hours of occurrence with minimal tissue damage have prognosis approaching 95 percent for survival. Delayed treatment with significant tissue compromise reduces survival rates to 50 percent or less. Complications including uterine rupture, severe hemorrhage, or sepsis worsen prognosis considerably. Cows that survive initial treatment generally do well long-term.

Return to production considerations for recovered cows include both immediate productivity and future breeding potential. Dairy cows can return to the milking herd once they have recovered sufficiently and completed any drug withdrawal periods. Future reproductive performance varies among studies but is generally good for cows that recover without major complications. Some studies report slightly reduced conception rates or increased pregnancy loss in subsequent breedings, while others find no difference from herdmates. Many successfully treated cows go on to produce multiple additional calves. Individual assessment of reproductive tract healing guides breeding decisions.

Vaccination is not applicable to uterine prolapse prevention since this is a mechanical condition rather than an infectious disease. Prevention focuses instead on management of the risk factors that predispose to prolapse, particularly hypocalcemia and dystocia. Understanding the circumstances that lead to prolapse allows implementation of targeted interventions that can significantly reduce incidence in herds that have experienced problems.

Biosecurity measures as traditionally defined do not apply to uterine prolapse. However, general hygiene in calving areas helps prevent contamination and infection of any prolapse that does occur, improving the prognosis for treatment. Clean, dry calving facilities with good footing reduce the risk of trauma and provide better conditions for calving management. Regular removal of manure and soiled bedding maintains a sanitary environment.

Nutritional management is central to uterine prolapse prevention, particularly through management of calcium metabolism around calving. Strategies to prevent hypocalcemia include dietary cation-anion difference management in the prepartum diet, calcium supplementation at calving, and vitamin D management. Avoiding excessive body condition at calving reduces both dystocia risk and some metabolic disorders. Adequate but not excessive protein and energy in late gestation supports cow and calf health without promoting oversized calves. Trace mineral supplementation supports muscle function and overall health.

Management practices to reduce prolapse risk include careful attention to calving management and assistance. Monitoring cows closely as calving approaches allows early detection and assistance with difficult deliveries before exhaustion develops. When assistance is needed, using appropriate technique and applying reasonable traction minimizes reproductive tract trauma. Avoiding excessive haste in removing the placenta manually reduces continued straining. Prompt treatment of hypocalcemia in any cow showing early signs prevents progression that could predispose to prolapse.

Monitoring and early intervention protocols should be established for high-risk situations. Cows with a history of prolapse in previous calvings are at higher risk for recurrence and warrant close observation. Cows that have experienced difficult deliveries should be monitored for several hours postpartum. Any cow showing signs of hypocalcemia should be treated immediately. Maintaining adequate staffing during calving season ensures timely detection of any problems. Having a veterinary relationship established facilitates rapid response when emergencies occur.

Daily management and monitoring for cows recovering from uterine prolapse involves regular assessment of their overall condition, appetite, and any discharge from the reproductive tract. During the immediate post-treatment period, checking multiple times daily for signs of reprolapse or complications is warranted. Temperature monitoring for the first week helps detect developing infections early. Recording feed and water intake provides objective measures of recovery progress. The cow should be kept in a comfortable environment where she can be easily observed.

Housing and environmental management during recovery should prioritize a clean, dry, well-bedded area with good footing. The cow should be able to rise and lie down easily without slipping. Isolation from herdmates prevents competition for resources and reduces stress. Climate control or protection from extreme weather supports recovery. Once immediate recovery is complete, the cow can be gradually reintegrated with the herd while continuing to monitor for any delayed complications.

Herd health programs should include protocols for calving management that reduce prolapse risk. These protocols address periparturient nutrition particularly calcium management, calving assistance guidelines, and monitoring procedures for fresh cows. Recording and analyzing any prolapse cases helps identify patterns and potential improvements. Regular review of incidence rates and circumstances allows continuous refinement of prevention efforts. Integration with overall reproductive management ensures that prolapse prevention is part of comprehensive breeding and calving programs.

Record keeping for uterine prolapse cases should document the circumstances including date, stage of labor when discovered, condition of the tissue, treatment provided, and outcome. Recording predisposing factors such as dystocia, hypocalcemia, or previous prolapse history helps identify risk patterns. Follow-up reproductive performance including breeding dates, conception results, and subsequent calvings provides information on long-term consequences. Maintaining these records across years builds institutional knowledge that guides prevention and management decisions.

Economic considerations for uterine prolapse include the immediate costs of emergency treatment, which can be substantial given the veterinary time and medications required, as well as the longer-term implications for the affected cow. Treatment costs typically range from several hundred to over a thousand dollars depending on complexity and complications. This investment is usually justified for valuable breeding animals given the good prognosis with prompt treatment. Prevention investments in better calving management and nutrition often have positive returns through reduced prolapse incidence and improved overall reproductive efficiency.

All cattle breeds can experience uterine prolapse, and no breed is immune to this condition. However, some breeds and production types have been associated with higher or lower incidence rates based on anatomical, physiological, and management factors. Dairy cattle, particularly Holsteins, are often reported to have higher prolapse rates than beef cattle, likely related to their greater susceptibility to hypocalcemia and the intensive management associated with dairy production. Zebu cattle and their crosses may have lower incidence rates in some studies, possibly related to calving ease and adaptation to extensive conditions.

Production type influences prolapse risk through several mechanisms. High-producing dairy cattle face metabolic challenges including hypocalcemia that predispose to prolapse. The intensive monitoring of dairy cattle may also result in more complete detection and reporting of cases. Beef cattle in extensive systems may have unobserved cases that resolve spontaneously or result in death without documentation. Management intensity, nutritional programs, and calving assistance practices associated with different production systems all influence actual incidence rates.

Genetic selection considerations for uterine prolapse focus on indirect selection against predisposing factors rather than direct selection against prolapse itself. Selecting for calving ease reduces dystocia and the associated prolapse risk. Genetic improvement of metabolic stability may reduce hypocalcemia susceptibility. Some breeding programs track and select against cows that have experienced prolapse to remove any genetic component of susceptibility. Because prolapse is a relatively rare event, genetic analysis is challenging, but avoiding breeding from repeat offenders is reasonable practice.

Commonly co-occurring conditions with uterine prolapse include hypocalcemia, which is both a predisposing factor and a frequent concurrent finding. Any cow with prolapse should be evaluated for hypocalcemia and treated if present. Retained placenta may be present with the prolapse and must be addressed during treatment. Vaginal and cervical tears may occur during the prolapse event or during dystocia that preceded it. Metritis following prolapse treatment is common and requires monitoring and treatment if it develops. Shock from blood loss and tissue trauma accompanies severe cases.

Conditions with similar presentation include vaginal prolapse, which occurs before calving when the vaginal wall protrudes through the vulva but the uterus remains in normal position. Vaginal prolapse does not display caruncles on its surface, allowing differentiation. Rectal prolapse presents as tissue protruding from the anus rather than the vulva. In rare cases of severe vaginal tears or rupture, intestines may protrude, which represents an extremely serious emergency requiring different management. Understanding these differentials ensures appropriate treatment.

Complications and sequelae of uterine prolapse include reprolapse if the organ is not properly retained following replacement. Metritis and uterine infection are common following prolapse due to contamination of the organ while exposed. Adhesions may form between the uterus and surrounding structures during healing, potentially affecting future fertility. Uterine artery rupture and severe hemorrhage can occur during the prolapse event or during replacement attempts. Long-term fertility may be reduced in some cows, though many recover normal reproductive function. Rarely, uterine rupture during prolapse or treatment may necessitate euthanasia.