Comparison of within-herd genetic evaluation procedures for beef cattle weaning weight. 1980

W D Slanger

The practicability of a specific procedure for within-herd genetic evaluation of beef cattle for weaning weight was tested with a data set of 503 Angus weaning weight records obtained from 1958 through 1976. Three different sets of genetic evaluations were obtained with the same model. The model included herd-year means, direct additive genetic values, maternal additive genetic values and random environmental errors. The evaluations of set 1 were best linear unbiased predictions (BLUP) with a full complement of equations, i.e., one for both the direct and maternal trait of all animals in the pedigree. To reduce computational load by eliminating predictions of little interest, either the direct or maternal equation for certain animals was deleted from the full complement. The resulting set 2 evaluations were also BLUP. A third method permitted further reduction in the number of equations and, therefore, computations, but the resulting set 3 evaluations were not BLUP. Thirty-seven and 43% less computer time was necessary to obtain evaluations of sets 2 and 3, respectively, than to obtain the set 1 evaluations. The correlations among the three sets of evaluations were very high, the average differences in rank small and the maximum absolute differences of predictions of the same genetic value small. The genetic, environmental and phenotypic trends obtained from each set of evaluations were similar. The results indicated that the genetic progress made from selection decisions based on evaluation sets 1, 2 and 3 would be similar.

UI MeSH Term Description Entries
D008297 Male Males
D001835 Body Weight The mass or quantity of heaviness of an individual. It is expressed by units of pounds or kilograms. Body Weights,Weight, Body,Weights, Body
D002417 Cattle Domesticated bovine animals of the genus Bos, usually kept on a farm or ranch and used for the production of meat or dairy products or for heavy labor. Beef Cow,Bos grunniens,Bos indicus,Bos indicus Cattle,Bos taurus,Cow,Cow, Domestic,Dairy Cow,Holstein Cow,Indicine Cattle,Taurine Cattle,Taurus Cattle,Yak,Zebu,Beef Cows,Bos indicus Cattles,Cattle, Bos indicus,Cattle, Indicine,Cattle, Taurine,Cattle, Taurus,Cattles, Bos indicus,Cattles, Indicine,Cattles, Taurine,Cattles, Taurus,Cow, Beef,Cow, Dairy,Cow, Holstein,Cows,Dairy Cows,Domestic Cow,Domestic Cows,Indicine Cattles,Taurine Cattles,Taurus Cattles,Yaks,Zebus
D005260 Female Females
D005820 Genetic Testing Detection of a MUTATION; GENOTYPE; KARYOTYPE; or specific ALLELES associated with genetic traits, heritable diseases, or predisposition to a disease, or that may lead to the disease in descendants. It includes prenatal genetic testing. Genetic Predisposition Testing,Genetic Screening,Predictive Genetic Testing,Predictive Testing, Genetic,Testing, Genetic Predisposition,Genetic Predictive Testing,Genetic Screenings,Genetic Testing, Predictive,Predisposition Testing, Genetic,Screening, Genetic,Screenings, Genetic,Testing, Genetic,Testing, Genetic Predictive,Testing, Predictive Genetic
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia

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