Authors : Sarder, M.J.U.
Abstract: The main finding of the present study was to evaluate the reproductive performances of different crossbred dairy cows under field condition. In total of 313 dairy cows information were collected from 33 Artificial Insemination Sub-centres or Points under the District AI centre, Rajshahi at greater Rajshahi district over a period from 1993 to 2002. The reproductive parameters were such as age at puberty, age at first service, age at first calving, gestation length, post-partum heat period, days open, wastage day, service per conception and caving intervals. The information of the reproductive parameters were analysed from questionnaires answered by 33 FA (AI) and dairy cows owner’s in respective AI Sub-centre or Points as well as from reading the AI and 100% progeny collection registers. In general, the mean age at puberty, age at first service, age at first calving, gestation length, post-partum heat period, days open, wastage day, service per conception and caving intervals were 27.9 month, 29.2 month, 38.7 months, 278.7 days, 20.7 kg, 139 days, 160 days, 20.3 days, 1.62 and 438 days, respectively. Genetic groups of LxF, LxFxSL, LxSL, LxSxSL and LxFxSxSL cows had significant effect on all the reproductive performances of dairy cows except on post-partum heat period, service per conception and wastage days. Among the 5 genetic groups, LxF cross-bred had shown excellent reproductive performances and most of these parameters were poor observed in LxSxSL cross-bred under field condition. It suggested that LxF cross-bred of dairy cows should be reared for better performance under rural condition.
Sarder, M.J.U. , 2006. Comparative Study on Reproductive Performance of Cross-Bred Dairy Cows at Greater Rajshahi District. Journal of Animal and Veterinary Advances, 5: 679-685.