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Asian-Australas J Anim Sci > Volume 10(3); 1997 > Article
Ruminant Nutrition and Forage Utilization
Asian-Australasian Journal of Animal Sciences 1997;10(3): 329-332.
DOI: https://doi.org/10.5713/ajas.1997.329    Published online June 1, 1997.
Conception rate of Pabna cows and heifers bred under artificial insemination and natural service
M. M. R. Howlader, M. F. Mian, A. H. M. Kamal, M. A. M. Prodhan, M. F. Rahman
Abstract
A study on the conception rate of 885 cows and heifers bred under artificial insemination (AI) and natural service was carried out at AI sub-centers. A high conception rate was observed at first service in all breeding methods. It was revealed that the conception rates in AI with liquid semen (LS) were found to be 25.08, 18.58, 12.69, and 2.48% after 1, 2, 3 and 4 services, respectively. Inseminations of cattle with frozen semen (FS) were found to achieve 42.15, 14.46, 5.85, and 2.46% conception rates after 1, 2, 3, and 4 services, respectively. In natural service, conception rates were found to be 62.45, 6.75, 5.91, and 4.64%, respectively, after 1, 2, 3, and 4 services. Insemination of cows and heifers at mid-cycle had significantly (p < 0.05) higher conception rate as compared to early and late cycles. The existing AI machineries and breeding management need to be improved to achieve higher conception rate of dairy cattle under AI.
Keywords: Conception Rate; Pabna Cows and Heifers; Artificial Insemination; Natural Service


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