Advances in Animal and Veterinary Sciences

Research Article
Adv. Anim. Vet. Sci. 2 (8): 464 - 467
View Full HTML
Download PDF

Muzamil Abdullah1, Tushar Kumar Mohanty1, Arumugam Kumaresan1*, Ashok Kumar Mohanty2, Ambadas Rakhamaji Madkar3, Rubina Kumari Baithalu1, Mukesh Bhakat4
1Livestock Research Centre, Livestock Production Management, National Dairy Research Institute, Karnal – 132001, Haryana India. 2Animal Biotechnology Centre, National Dairy Research Institute, Karnal – 132001, Haryana, India. 3Livestock Production Management, Indian Veterinary Research Institute, Izatnagar, Bareilly, Uttar Pradesh - 243122, India. 4Artificial Breeding Research Centre, National Dairy Research Institute, Karnal – 132001, Haryana, India.

Early pregnancy diagnosis is essential for effective management of pregnant animals and early submission of non-pregnant animals for subsequent breeding to reduce calving to conception interval. The present study assessed the accuracy in early pregnancy diagnosis by ultrasonography and estimated the loss due to delayed identification of non-pregnant animals. Transrectal ultrasonography was used to diagnose the pregnancy in dairy animals (n=47) at 30 and 45 days post breeding. The sensitivity and specificity was found to be 92.30% and 97.05%, respectively, on day 30 and reexamination was done at day 45 for confirmation of pregnancy. Animals found positive for pregnancy by ultrasound scanning on day 30 post-breeding had significantly high concentrations of plasma progesterone (> 3ng/ml) on day 20 post-breeding. It was found that pregnancy diagnosis using ultrasonography 30 days after AI can reduce number of open days by 15 days and 30 days compared to per rectal examination, which is generally done on day 45 and day 60 post-breeding, respectively. It was found that one day increase in open period resulted in loss (rearing and milk costs) to the tune of INR 281 and INR 368 in Sahiwal and Karan Fries cows, respectively. It was calculated in Karan Fries cows that if the calving interval is reduced by 1 month due to early pregnancy diagnosis, the expected gain of life time productive days would be around 132 days, which in turn would lead to benefit of about INR 48466. It can be concluded that use of ultrasonography at an early date (at 30 days) post breeding is an effective method for accurate identification of non-pregnant animals to reduce the calving to conception interval in dairy animals.