Author:
Wijeratne W. V. S.,Stewart D. L.
Abstract
SUMMARYThe incidence of abortions over a period of eight years was studied in 107 393 progeny of 100 bulls belonging to five dairy and three beef breeds of cattle. The calving records related to the first four artificial inseminations on females with fresh or frozen semen.The average frequency of abortion was 2·12%. Differences in rates of abortion between the breeds of sire were statistically significant although this may be confounded with the breed of dam. The highest incidence was from matings by bulls of the Channel Island breeds and the least from matings to Ayrshire bulls.The rates of abortion increased with the number of inseminations necessary for conception.There was a slightly higher incidence of abortions among twin births than among singles.
Publisher
Cambridge University Press (CUP)
Subject
Animal Science and Zoology
Reference19 articles.
1. Mitchell D. 1964. An abortion problem in cattle. Vth int. Cong. Anim. Reprod. Artif. Insem., 4, 102–107.
2. Fertilization Rates and Embryonic Death Rates in Cows Bred to Bulls of Different Levels of Fertility
3. Seath D. M. , Staples C. H. and Neasham E. W. 1943. A study of breeding records in dairy herds. Bull. Lo. agric. Exp. Stn., No. 370.
4. Geneva Conference: Standardization of Procedures for Chromosome Studies in Abortion
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