Selection indices for Canadian beef production using specialized sire and dam lines
نویسندگان
چکیده
منابع مشابه
Milk production traits of beef cows as affected by horn fly count and sire breed type.
Horn fly infestations negatively impact economic traits of beef cattle. Our objective was to determine the impact of horn flies on beef cattle milk yield and quality. Cows (n = 53) were derived from Brangus dams and sired by Bonsmara (n = 7), Brangus (n = 13), Charolais (n = 8), Gelbvieh (n = 5), Hereford (n = 12), and Romosinuano (n = 8) bulls. Horn fly counts and estimates of milk yield and q...
متن کاملCovariances among sire by breed group of dam interaction effects in multibreed sire evaluation procedures.
In multibreed populations, bulls need to be evaluated for additive and nonadditive genetic effects. When the nonadditive genetic effects associated with a bull are defined as sire x breed-group-of-dam interactions, they can be expressed as linear combinations of interactions between alleles of one or more breeds at one or more loci. If these specific allelic interactions are assumed to be indep...
متن کاملSire x herd interactions for weaning weight in beef cattle.
Weaning weight records of 44,357 Australian Angus calves produced by 1,020 sires in 90 herds were used to evaluate the importance of sire x herd interactions. Models fitted fixed effects of contemporary group (herd-year-date of weighing subclass), sex, calf age, and dam age and random effects of sire or of sire and sire x herd interaction using REML. Effects of standardizing the data, including...
متن کاملDam and Sire Effects on Sperm Penetration of the Perivitelline Layer and Resulting Fecundity of Different Lines of Turkeys
All birds studied thus far are able to store spermatozoa within their oviducts for periods that can vary from several days to weeks, depending upon the species. Turkeys have a relatively long storage period compared with chickens, an observation that leads to the suggestion that sperm residing within the oviduct may interact with sperm entering the oviduct from later inseminations. Multiple sou...
متن کاملGenetics of Reproduction: Considerations for Sire Selection
genetic selection to improve economically important traits. Most recently, much of that progress has been through the implementation of expected progeny differences (EPDs). Expected progeny differences make it possible to compare the genetic merit of two or more animals for any number of traits. Most EPDs involve growth or carcass traits, because most producers are paid by the pound, or in some...
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ژورنال
عنوان ژورنال: Canadian Journal of Animal Science
سال: 1994
ISSN: 0008-3984,1918-1825
DOI: 10.4141/cjas94-060