Author:
Donald H. P.,Russell W. S.
Abstract
An account is given of the conception rates (in terms of calves born) following artificial insemination of contemporary purebred and crossbred cattle derived from purebred Friesian, Ayrshire and Jersey stock in an experimental herd. First inseminations were given to 222 purebred and 495 crossbred females approaching first pregnancy; and to 165 purebred and 347 crossbred females approaching second pregnancy. Fitted values for conception rates showed no noteworthy differences for year, season, age of female, or breed of bull. Crossbred females, however, were about 10% more likely to conceive than purebreds. Purebred females mated to bulls of their own breed showed lower conception rates than those mated to bulls of another breed.
Publisher
Cambridge University Press (CUP)
Subject
Animal Science and Zoology
Reference6 articles.
1. Birth weights of reciprocally cross-bred calves
2. Zebu-European crossbreeding as a basis of dairy cattle improvement in the U.S.A.;Branton;5th Coop. Ser. Bull.,1966
3. Crossbreeding of dairy cattle in temperate zones: A review of recent studies;Pearson;Anim. Breed. Abstr.,1968
4. The genetical basis of conformation in cattle as revealed by crossbreeding
5. Hybrid vigour in beef cattle;Mason;Anim. Breed. Abstr.,1966
Cited by
16 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献