Post artificial insemination conception rate of a Brahman bull in selected areas of Bangladesh.

Islam, M. T.; Bhuiyan, M. J. S.; Juyena, N. S.; Bhuiyan, M. M. U.

Background: To fulfill the increasing protein demand in Bangladesh, the government has started a programme to inspire the farmers for rearing Brahman as a beef breed. The objectives of the present investigation were to assess the performance of frozen semen of Brahman bulls with respect to conception rate and its associated influencing factors in Bangladesh. Methods: Data on AI performance, different factors and rate of conception were collected from 150 inseminated cows and heifers of Sadar upazila under Mymensingh district. The cows were inseminated by trained technician using frozen semen of a Brahman bull reared in Research Animal Farm of Department of Surgery and Obstetrics, Bangladesh Agricultural University, Mymensingh. Results: The overall conception rate was 55.3%. The conception rate in Holstein Friesian cross (68.9%) was significantly higher than that of Local (46%) cows (P<0.05). The conception rate in cows with BCS 2.5 - 3.0 was higher (60.7%) than that of BCS 2.0 and 3.5 -4.0 (42.0 and 41.7%, respectively) (P>0.05). Cows received insemination at parity 1-2 showed the highest conception rate (60.0%) and cows received insemination at parity 3-7 showed the lowest conception rate (47.0%) (P>0.05). Cows received insemination at 2 - <4 years age showed the highest conception rate (58.7%) and cows received insemination at 8 - 11 years age showed the lowest conception rate (41.2%) (P>0.05). AI done in cows yielding 6 -10 litres milk showed the highest conception rate (76.9%) and the lowest conception rate (42.5%) was found in cows yielding 1 - 2 litres milk (P<0.05). Cows inseminated at 19-24 hours interval between oestrus to AI had the highest conception rate (66.0%) and the lowest (38.1%) was in cows inseminated at =12 hours interval (P<0.05). The conception rate was the highest (69.2%) when insemination was done in Spring and the lowest (38.5%) was in rainy season (P>0.05). Conclusions: The overall conception rate was within acceptable level but further studies using more population of cows and semen donors are needed to confirm this result.

BANGLADESH; MYMENSINGH (Bangladesh); ARTIFICIAL insemination; FROZEN semen; DOMESTIC animals; CATTLE fertility; COWS; BULLS; HEIFERS

Bangladesh Journal of Veterinary Medicine, 2019, Vol 17, Issue 1, p61

1729-7893

Academic Journal

10.33109/bjvmjj19fam4