The present study was conducted to determine the conception rate of cows/heifers artificially inseminated at Upazila Livestock Office, Rajarhat, Kurigram. A total of 184 cows/heifers of different breed, age, season, body weight and parity were selected and artificial insemination was performed by using frozen semen. The cows were inseminated between 6-20 hrs. of onset of heat. All cows were examined for pregnancy by rectal palpation of genital tract at 80-90 days post AI. One hundred and seven were inseminated 1 or 2 times and 77 animals for 3 and more services. Out of 184 animals 101 animals were conceived and 83 animals did not conceived. The overall conception rates were 54.9%. A significantly decreased conception rate (p<0.01) was observed in age group more than 8 years than other groups. Cows received insemination at parity 1 showed highest conception rate (73%) and cows received insemination at parity 6 showed lowest conception rate (25%). The overall and within group conception rate percentage in Local (52.9%) and Friesian cross (62.3%) cows/heifers were relatively higher than that of Sahiwal cross (40%). However the difference was not significant (p>0.05).The conception rate was observed significantly higher (78.9%) in the cows which were inseminated in spring than the cows were inseminated in summer (29.8%), winter (72.1%) and rainy (35.7%) season. The conception rate was significantly higher (p<0.01) in 1st and 2nd service compared with 3rd services (89.7% vs 6.5%). A proportion of cows, which failed to conceive in the first service repeated in second, third services and or more. 1386527992.php
Post AI Conception Rate in Cattle at Rajarhat, Kurigram, Bangladesh.
Date : 2014-04-09 Volume : 6