Don't Pull It: Patience and Monitoring Are What Get You Through a Retained Placenta
A retained placenta, when the afterbirth doesn't pass within the normal timeframe, is one of the most common post-calving complications. It may seem like a minor issue compared to calving difficulties, but improper management can lead to serious infections, delayed rebreeding, and even death. Knowing the causes, proper management, and when to intervene helps you get the best outcomes for affected cows.
Normal Placenta Passage
Most placentas pass within 2-8 hours of calving, and by 12 hours roughly 95% have passed. Up to 12 hours is generally considered normal. The process works in stages: blood supply to the placentomes (attachment points) decreases, placental tissue separates from the caruncles (uterine buttons), and contractions expel the membranes.
Definition of Retained Placenta
A placenta is considered retained if it hasn't passed within 12-24 hours after calving. The incidence runs about 3-5% in beef cattle and 5-15% in dairy cattle, with higher rates after abnormal calvings.
Why Placentas Are Retained
Primary Causes
The placenta can fail to separate due to inflammation or infection of the placenta itself, edema (swelling) of caruncles or cotyledons, or nutritional deficiencies affecting tissue integrity. Mechanical factors include physical obstruction and exhaustion of the cow after a hard delivery.
Risk Factors
| Risk Factor | Why It Increases Retention |
|---|---|
| Dystocia | Uterine exhaustion, tissue trauma |
| Cesarean section | Surgical trauma, incomplete contraction |
| Twins | Larger placenta, stretched uterus |
| Stillbirth | Abnormal hormonal signals |
| Abortion | Incomplete pregnancy |
| Induced calving | Premature separation attempt |
| Premature birth | Placentome not ready to separate |
| Milk fever | Low calcium impairs contractions |
| Uterine infection | Inflammatory adhesions |
| Hot weather | Stress, dehydration |
| Selenium/Vitamin E deficiency | Impaired immune function |
| Vitamin A deficiency | Epithelial integrity compromised |
Breed and Age Factors
Older cows (with decreased uterine tone) and first-calf heifers that experienced dystocia carry higher risk. Lower risk groups include mature cows with normal calvings and cattle on adequate mineral programs.
What NOT to Do
Never Manually Remove the Placenta
This point deserves emphasis because the temptation is strong. Manual removal causes uterine damage: caruncles are torn, causing hemorrhage. Your hands and arms introduce bacteria. Damaged caruncles heal more slowly, and scarring plus infection impair future conception. The short version: keep your hands out of the cow.
Don't Use Weights or Tension
Do not hang weights on the membranes, pull on them, or cut off hanging portions prematurely. All of these increase the risk of uterine damage.
Proper Management
The Waiting Approach
The best approach is usually the simplest. Wait. Monitor the cow for signs of illness, provide supportive care (water, nutrition), and intervene only if systemic illness develops.
When to Be Concerned
| Sign | What It Means |
|---|---|
| Fever >103.5 degrees F | Infection developing |
| Off feed | Systemic illness |
| Depression | Toxemia |
| Foul odor | Bacterial decomposition |
| Decreased milk production | Illness |
| Straining excessively | Discomfort, possible metritis |
Natural Timeline
| Days After Calving | What to Expect |
|---|---|
| 1-3 | Membranes hanging, may smell slightly |
| 3-5 | Decomposition begins, odor increases |
| 5-7 | Membranes becoming fragile, starting to fall away |
| 7-10 | Most membranes have dropped or absorbed |
| 10-14 | Complete resolution in most cases |
Treatment Approaches
Conservative Management (Preferred)
Check the cow's temperature twice daily, observe appetite and attitude, allow the placenta to decompose naturally, keep the cow in a clean environment, and ensure adequate nutrition and water. Continue this approach as long as temperature remains normal (under 103 degrees F), there is no excessive straining, and no signs of severe illness.
Antibiotic Treatment
Antibiotics are warranted when the cow shows signs of systemic illness, foul discharge beyond what is normal, or decreased appetite and milk production.
| Route | Advantage | Consideration |
|---|---|---|
| Systemic (injectable) | Reaches bloodstream, systemic protection | Withdrawal times, cost |
| Intrauterine (boluses) | Direct local action | Effectiveness debated, may not reach all tissue |
Hormone Treatment
Oxytocin is most effective if given within 24-48 hours of calving, with limited benefit after 48 hours. It requires a veterinary prescription. Prostaglandin may be used later for reproductive management.
Supportive Care
Provide high-quality feed to maintain energy, calcium supplementation if the cow is at risk for milk fever, a clean and dry environment, and regular observation for complications.
Complications
Metritis (Uterine Infection)
This is the most serious complication. Infection can become systemic (septicemia) and life-threatening if severe. Signs include foul-smelling watery discharge, severe depression, rapid pulse and breathing, decreased milk production, and going completely off feed. Treatment typically requires systemic antibiotics, supportive care (fluids, NSAIDs), and may include uterine lavage.
Delayed Uterine Involution
The uterus normally returns to breeding size within about 40 days. A retained placenta and infection delay this process, which affects the cow's return to cycling and results in lower conception rates and an extended calving interval.
Chronic Endometritis
In some cases, persistent discharge, poor conception rates, and ongoing low-grade infection develop. This condition may require extended treatment and can be a culling factor.
Effect on Reproduction
Documented Impacts
| Measure | Normal Calving | Retained Placenta |
|---|---|---|
| Days to first heat | 45-60 | 60-90 |
| Services per conception | 1.5-2.0 | 2.0-3.0 |
| Pregnancy rate | 85-95% | 65-80% |
| Culling rate | Normal | Increased |
Recovery Timeline
Fertility typically returns by 60-90 days. The cow may need one additional breeding cycle to conceive. Some cows require culling if chronic infection develops and does not resolve with treatment.
Prevention Strategies
Nutritional Management
Keep body condition appropriate (avoid overconditioning above BCS 7), provide adequate protein for immune function, and maintain a balanced mineral program.
| Mineral/Vitamin | Role | Recommended Level |
|---|---|---|
| Selenium | Immune function, tissue integrity | 0.1-0.3 ppm diet or injectable |
| Vitamin E | Works with selenium | 400-800 IU/day |
| Vitamin A | Epithelial health | 30,000-50,000 IU/day |
| Copper | Immune function | 10-15 ppm |
| Zinc | Healing, immune function | 40-50 ppm |
Calving Management
Minimize dystocia through appropriate sire selection, adequate observation during calving, and timely intervention when needed. Around calving time, reduce handling stress and ensure the cow has adequate nutrition and water.
Preventing Metabolic Problems
Milk fever increases retention risk, so calcium supplementation at calving and prompt treatment at the first signs of hypocalcemia are both worthwhile steps.
Records and Culling Decisions
Documentation
Record calving details (date, difficulty, live or dead calf), duration of retention, treatment given, outcome, and subsequent reproductive performance. These records help you spot patterns over time.
When to Consider Culling
Consider culling when chronic endometritis doesn't respond to treatment, severe metritis with slow recovery occurs, fertility is significantly impaired, or the economic value of the cow doesn't justify continued treatment costs.
Genetic Considerations
Consider retention history when selecting replacements. Don't automatically cull a cow for a single episode, but keep an eye on family lines that show a pattern.
Veterinary Involvement
When to Call
Contact your veterinarian when the cow becomes depressed or stops eating, when signs of severe metritis appear (foul discharge, very sick cow), when you are uncertain about the right management approach, or when the cow is high-value and you want proactive management.
What the Vet May Do
The veterinarian may check temperature, perform uterine palpation, administer a systemic antibiotic injection or anti-inflammatory medication, provide fluid therapy if the cow is dehydrated, perform uterine lavage in severe cases, and give you a reproductive prognosis assessment.
Management Timeline
Day-by-Day Approach
Day 1 (0-12 hours): No action needed yet.
Day 1-2 (12-48 hours): Check the cow's temperature, monitor appetite and attitude, and begin daily observations.
Days 3-5: Continue daily temperature checks and watch for illness signs. Do NOT pull or manipulate the membranes.
Days 5-10: There may be some odor, which is normal. Continue monitoring for systemic illness and call the vet if fever or illness develops.
Days 10-14 and beyond: Document any complications and plan for rebreeding based on recovery.
30+ days post-calving: Assess return to cycling and plan the breeding timeline.
Frequently Asked Questions
The Bottom Line on Retained Placenta
Retained placenta is a common complication that usually resolves without serious consequences when managed properly. The keys are patience, careful monitoring, and resisting the urge to manually intervene. Let nature take its course unless systemic illness develops, in which case prompt veterinary involvement and the right antibiotic therapy can prevent life-threatening complications.
Related Resources
- Post-Calving Cow Care
- Metritis Recognition and Response
- Dystocia: When Calving Goes Wrong
- Preparing for Calving Season
References
- Sheldon, I.M., et al. "Defining postpartum uterine disease in cattle." Theriogenology.
- Drillich, M., et al. "Comparison of two protocols for the treatment of retained fetal membranes in dairy cattle." Theriogenology.
- Beagley, J.C., et al. "Physiology and treatment of retained fetal membranes in cattle." Journal of Veterinary Internal Medicine.
- LeBlanc, S.J. "Postpartum uterine disease and dairy herd reproductive performance: A review." The Veterinary Journal.
- Texas A&M AgriLife Extension. "Managing Retained Placentas." agrilifeextension.tamu.edu
- Beef Cattle Research Council. "Post-Calving Cow Management." beefresearch.ca
