Làm thế nào để bạn ngăn ngừa sẩy thai ở bò?

Sự sẩy thai, hoặc phá thai, ở bò là một mối quan tâm đáng kể đối với các nhà chăn nuôi, ảnh hưởng đến cả phúc lợi động vật và lợi nhuận của trang trại. Preventing such reproductive losses requires a comprehensive understanding of the various factors involved and implementing effective management strategies. This article delves into the primary causes of miscarriages in cows and offers practical measures to mitigate these risks.

Understanding the Causes of Miscarriage

Miscarriages in cows can result from a combination of infectious agents, nutritional deficiencies, environmental stressors, and management practices. Recognizing these factors is the first step toward prevention.

Infectious Agents

Several pathogens are known to cause abortions in cattle:

• Bovine Viral Diarrhea (BVD) và Infectious Bovine Rhinotracheitis (IBR): These viral infections can lead to embryonic death and abortion. Vaccination programs have been effective in reducing their impact [1].

• Leptospirosis: A bacterial infection that can cause abortions, stillbirths, and infertility. Vaccination and controlling rodent populations are key preventive measures [2].

• Neospora caninum: A protozoan parasite transmitted through dog feces, leading to abortions, especially in dairy herds. Preventing dog access to feed and water sources is crucial [3].

Nutritional Deficiencies

Proper nutrition is vital for maintaining pregnancy:

• Minerals and Vitamins: Deficiencies in selenium, iodine, manganese, and vitamins A and E can increase the risk of abortion [4].

• Energy Balance: Negative energy balance, especially in high-producing dairy cows, can lead to early embryonic loss. Ensuring cows have adequate energy intake is essential [5].

Environmental Stressors

Stressful conditions can adversely affect pregnancy:

• Heat Stress: Elevated temperatures can impair embryo development and lead to early pregnancy loss. Providing shade, ventilation, and cool water helps mitigate this risk [6].

• Transportation: Moving cows during early pregnancy (days 5–55) can increase the risk of miscarriage. It’s advisable to transport cows either within the first 4 days post-breeding or after 60 Ngày [7].

Management Practices

Certain practices can inadvertently contribute to miscarriages:

• Toxins: Ingestion of toxic plants like hemlock or contaminated feed can cause abortions. Regularly inspect pastures and feed for potential toxins [8].

• Medication Errors: Administering certain drugs, such as prostaglandins or corticosteroids, during pregnancy can induce abortion. Always consult a veterinarian before treating pregnant cows [9].

Preventive Measures

Implementing the following strategies can significantly reduce the incidence of miscarriages in cows:

1. Vaccination Programs

Establish a comprehensive vaccination schedule tailored to your herd’s needs:

• Pre-breeding Vaccinations: Administer vaccines against BVD, IBR, and leptospirosis before the breeding season [1].

• Booster Shots: Ensure timely booster vaccinations as recommended by your veterinarian.

2. Nutritional Management

Maintain optimal nutrition throughout the cow’s reproductive cycle:

• Balanced Diet: Provide a diet rich in essential minerals and vitamins. Regularly test forage and feed quality [4].

• Body Condition Monitoring: Aim for a body condition score (BCS) of 5–6 at calving. Adjust feeding regimens accordingly [5].

3. Environmental Control

Create a comfortable environment to minimize stress:

• Heat Abatement: Use fans, misters, and provide shade to reduce heat stress during hot months [6].

• Gentle Handling: Train staff in low-stress handling techniques to prevent injuries and stress-induced abortions.

4. Biosecurity Measures

Protect your herd from infectious diseases:

• Quarantine New Additions: Isolate new animals for at least 30 days and test for common diseases before integrating them into the herd [2].

• Control Wildlife Access: Prevent access of dogs and rodents to feed and water sources to reduce disease transmission [3].

5. Regular Veterinary Care

Engage a veterinarian for ongoing herd health management:

• Reproductive Health Checks: Schedule regular examinations to monitor pregnancy progress and detect potential issues early.

• Ultrasound Monitoring: Utilize siêu âm thú y to assess fetal development and identify any abnormalities promptly.

Kết thúc

Preventing miscarriages in cows is a multifaceted endeavor requiring diligent attention to animal health, nutrition, environment, and management practices. By understanding the underlying causes and implementing proactive measures, livestock producers can enhance reproductive success and ensure the well-being of their herds.

References

1. Preventing Reproductive Failure in Cow-Calf Herds – BeefResearch.ca
   https://www.beefresearch.ca/topics/preventing-reproductive-failure-in-cow-calf-herds/

2. How to reduce the risk of abortions in cattle – Farmers Weekly
   https://www.fwi.co.uk/livestock/beef/how-to-reduce-the-risk-of-abortions-in-cattle

3. Understanding Abortion in Cattle: Causes and Preventive Measures – Cattle Daily
   https://cattledaily.com/abortion-in-cattle/

4. Factors That Contribute to Pregnancy Losses in Beef Cattle – Drovers
   https://www.drovers.com/news/beef-production/factors-contribute-pregnancy-losses-beef-cattle

5. Reduce pregnancy losses with these tips – Ag Proud
   https://www.agproud.com/articles/20935-reduce-pregnancy-losses-with-these-tips

6. Solving Pregnancy Loss In Cattle – Beef Magazine
   https://www.beefmagazine.com/calving/solving-pregnancy-loss-in-cattle

7. Management Strategies for Minimizing Early Pregnancy Loss – UNL Beef
   https://beef.unl.edu/beefwatch/2021/management-strategies-minimizing-early-pregnancy-loss/

8. Investigating pregnancy loss in cattle – Ag Proud
   https://www.agproud.com/articles/52903-investigating-pregnancy-loss-in-cattle

9. NADIS – Dealing with Abortion – National Animal Disease Information Service
   https://nadis.org.uk/disease-a-z/cattle/fertility-in-dairy-herds/part-6-dealing-with-abortion