Scope for a Joint Genetic Evaluation of New Zealand and Australian Angus Cattle
نویسنده
چکیده
Genetic parameters and adjustment factors for birth, weaning, yearling and final weight were estimated for the New Zealand Angus population, fitting an animal model including maternal genetic and permanent environmental effects as additional random effects. Overall, pooled covariance matrices agreed well with those for Australian Angus, though heritability estimates for birth weight were somewhat lower than in Australian Angus. BreedPlan estimates of breeding values and their accuracies were obtained for each population separately. Correlations between estimates for sires with accurate proofs in both countries agreed with their expectations, giving no indications of genotype × environment interactions.
منابع مشابه
Estimates of genetic parameters and breeding values for New Zealand and Australian Angus cattle
Genetic parameters and adjustment factors for birth, weaning, yearling and final weight were estimated for the New Zealand Angus population, fitting an animal model including maternal genetic and permanent environmental effects as additional random effects. Overall, pooled covariance matrices agreed well with those for Australian Angus, though heritability estimates for birth weight were somewh...
متن کاملLinkage disequilibrium and persistence of phase in Holstein-Friesian, Jersey and Angus cattle.
When a genetic marker and a quantitative trait locus (QTL) are in linkage disequilibrium (LD) in one population, they may not be in LD in another population or their LD phase may be reversed. The objectives of this study were to compare the extent of LD and the persistence of LD phase across multiple cattle populations. LD measures r and r(2) were calculated for syntenic marker pairs using geno...
متن کاملRunning head : REGRESSION ON MATERNAL PHENOTYPE Estimates of genetic parameters for weaning weight of beef cattle accounting for direct-maternal environmental covariances
Restricted Maximum Likelihood algorithm estimates of (co)variance components due to maternal effects as well as a regression on maternal phenotype were obtained for seven weaning weight data sets of Australian and New Zealand beef cattle. Fitting such regression, analyses accounted for environmental covariances between dams and their offspring. Results show a substantial, negative regression on...
متن کاملAccuracy of Igenity genomically estimated breeding values for predicting Australian Angus BREEDPLAN traits.
Genomically estimated breeding values (GEBV) for Angus beef cattle are available from at least 2 commercial suppliers (Igenity [http://www.igenity.com] and Zoetis [http://www.zoetis.com]). The utility of these GEBV for improving genetic evaluation depends on their accuracies, which can be estimated by the genetic correlation with phenotypic target traits. Genomically estimated breeding values o...
متن کاملGenetic Correlations Between Carcass Traits And Molecular Breeding Values In Angus Cattle
American Angus Association (AAA) has collected data for genetic evaluation of marbling (MRB), longissimus muscle area (LMA), subcutaneous fat depth (SQF), and carcass weight (CWT) since 1974 (Wilson et al., 1993). In 1997, that genetic evaluation was augmented with a separate evaluation of ultrasound indicator traits measured on yearling bulls and heifers. These data are now analyzed simultaneo...
متن کامل