Title of article :
Parity Differences in Heat Expression of Dairy Cows Synchronized with GnRH, CIDR and PGF2α during Dry Season in Zambia
Author/Authors :
Mwaanga, E. S. University of Zambia - School of Veterinary Medicine - Department of Biomedical Sciences, Zambia , Choongo, K. University of Zambia - School of Veterinary Medicine - Department of Biomedical Sciences, Zambia , Simukoko, H. University of Zambia - School of Veterinary Medicine - Department of Biomedical Sciences, Zambia , Chama, C. Makeni Dairy Small-holder, Zambia
Abstract :
A study was conducted to investigate parity differences in heat expression of dairy cows heat-synchronized during the dry season when feed scarcity is common. Cyclic cows (n=65) aged 2 to 10 years with parity range of 0 to 7 were selected from small-holder dairy farms around Lusaka. Cows were divided into 3 groups of nulliparous, primiparous and pluriparous. Heat-was synchronized using gonadotrophin releasing hormone (GnRH) and controlled intra-vaginal drug releasing device (CIDR). Heat detection was observed after CIDR withdraw. The study showed a significantly (P 0.05) lower number of primiparous cows (68%) coming into heat compared to nulliparous (81.8%) and pluriparous cows (83.3%). It was concluded that parity influences estrus expression rate in dairy cows following synchronization with GnRH, CIDR and PGF2α during the dry season in the subtropics.
Keywords :
Dry season , Heat , Holstein cows , Parity , Synchronization
Journal title :
Pakistan Veterinary Journal
Journal title :
Pakistan Veterinary Journal
