Study on factors affecting the conception rate in Red Chittagong Cows
Keywords:Red Chittagong cows, Artificial insemination, Conception rate
The research was undertaken to identify the factors affecting the conception rate in Red Chittagong cows (RCC). A total of 130 questionnaires were filled up to collect the related data during artificial insemination (AI) and subsequently pregnancy diagnoses were done after three months of AI at five upazillas (Satkania, Chandanaish, Potia, Anwara and Raozan) in Chittagong district. Conception rate of heifers and cows delivered 1, 2, 3 and 4 calves were 64.52, 72.73, 64.86, 60 and 53.33%, respectively. Conception rates were 19.4% higher in 1st delivered cows than that of the older cows attained the 4th or more parities. Red Chittagong Cows producing 3 kg or more milk during AI period had lower conception rate than the low producing cows. The conception rates of RCC were higher when inseminated between 10 to >14 hours after onset of estrous and the value was 74.19%. The conception rates of RCC were higher at a thawing period of 10-12 seconds than 5-7 seconds and 15-17 seconds and varied significantly. The conception rate was 10.62% higher in RCC for semen deposited in the body of uterus than deposited at the middle of the cervix. The conception rate of RCC for normal, difficult calving, retained placenta, uterine infectious and cystic ovaries cows were 70.27, 50, 33.33, 25 and 0%, respectively and the overall conception rate of disordered cows were 31.57%. In this study, the overall conception rate of RCC was found in 63.85%. This figure can be improved by taking different measures like; insemination at observing clear mucus and 10.0-14.0 hours after the onset of estrous, thawing of straw at 37ºC for at least 10-12 seconds, heating of insemination devices, service at docile condition, placement of semen at the body of the uterus and avoid crossing of RCC with exotic blood to ensure protection from health disorder like difficult calving and retained placenta.
Key words: Red Chittagong cows; Artificial insemination; Conception rate
Bang. J. Anim. Sci. 2010, 39(1&2): 52-57
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