[Download] ~ Subfertility in Males: An Important Cause of Bull Disposal in Bovines (Report) ~ by Asian - Australasian Journal of Animal Sciences ~ eBook PDF Kindle ePub Free

eBook details

Title: Subfertility in Males: An Important Cause of Bull Disposal in Bovines (Report)
Author : Asian - Australasian Journal of Animal Sciences
Release Date : January 01, 2010
Genre: Industries & Professions,Books,Business & Personal Finance,
Pages : * pages
Size : 277 KB

Description

INTRODUCTION A systematic and intensive multistage selection of the male animals is practised in bull mother farms, commercial and institutional herds. Optimum serving capacity and seminal profile are indispensable parameters for evaluation of breeding soundness of dairy bulls. A wide variation in the male reproductive parameters is observed between the breeds of different species of dairy animals. Moreover, very few reports are available on the problems associated with sexual behavior and semen characteristics of exoticx indigenous crossbred bulls, under the tropical conditions. The production traits in animals are mainly genetic in nature; however, reproduction parameters are more influenced by environment. The present investigation was designed to investigate the occurrence of subfertility traits leading to wastage of dairy bulls and to study the factors like, species/breeds, season of birth and period of birth affecting the male reproductive parameters. Three species-breeds, namely, Karan Fries (KF), Sahiwal cattle and Murrah buffalo bulls were studied. The genetic and environmental back grounds of those three species-breeds under study were considered. The Karan Fries bulls were the crossbreds of Holstein Friesian with Tharparkar/ Sahiwal zebu cattle while the Sahiwal cattle and the Murrah bulls were purebred and produced through selective breeding. The animals were reared at the Artificial Breeding Complex (ABC); National Dairy Research Institute, Karnal, in loose housing system in individual bull pans, under stall-fed condition and uniform managemental practices.