Journal details
Effect of age, parity and breed on conception rate and number of service per conception in artificially inseminated cows
Published Date: 30 Dec 2015
Keywords: cow, conception rate, Zebu, Holstein, Sahiwal
Muhammad Rakibul Kabir Khan1, Jashim Uddin2 and Md. Royhan Gofur*2
1Department of Surgery & Obstetrics, Bangladesh Agricultural University, Mymensingh, Bangladesh, 2Department of Animal Husbandry & Veterinary Science, University of Rajshahi, Rajshahi-6205, Bangladesh
Abastract:
Context: Age, parity and breed have effect on high conception rate of dairy cows which is very important for success of Dairy farms.
Objectives: To determine the effects of age, parity and breed of the cows on conception rate and number of services per conception in artificially inseminated cows at Bangladesh Agricultural University Veterinary Clinic, Mymensingh, Bangladesh.
Materials and Methods: A total of 133 animals were inseminated during the specified time brought to the BAU Veterinary Clinic using frozen (cryo preserved) semen. The cows were inseminated between 6-20 hrs of onset of heat; data (history) obtained from the owners.
Results: Out of 133 animals 101 animals required 1-2 services and 32 animals required 3 or more services. Out of 133 animals, 79 animals were conceived. Out of 1-2 serviced animals showing conception rate 62.4% and 3 or more serviced animals showing conception rate 50%. The overall conception rate with frozen semen (in native Zebu cows, Holstein Cross and Sahiwal Cross) was 59.3%. A significantly increased conception rate was found in both Parity 2 and 3 (P ≤ 0.02) and conception rate was 73-75%. Cows with parity 2 and 3 had several times increased conception rate than the nulliparous animals. In different age groups conception rate was the highest in between 3.5-5 years, (77.8%) and cows with age group more than 9 years had significantly decreased (P ≤ 0.001) conception rate than other age groups. In different breed groups, conception rate was the highest (64%) in native cattle and intermediate (57%) in Friesian cross and the lowest (53%) in Sahiwal cross. The service per conception was the lowest (1.6) in Friesian cross, intermediate (1.8) in Sahiwal cross and the highest (2.3) in local cows. More service was required for heifer than older animals.
Conclusion: Friesian cross and cows with parity 2-3 were the best choice of selection for a dairy farm in respect to age, conception and the lowest service per conception. The lower service per conception is a desirable merit in breeding of animals.