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Full-Text Articles in Animal Sciences
Estimation Of Variances Due To Direct And Maternal Effects For Growth Traits Of Nelore Cattle, J. P. Eler, L. Dale Van Vleck, J. B. S. Ferraz, R. B. Lobo
Estimation Of Variances Due To Direct And Maternal Effects For Growth Traits Of Nelore Cattle, J. P. Eler, L. Dale Van Vleck, J. B. S. Ferraz, R. B. Lobo
Department of Animal Science: Faculty Publications
Estimates of (co)variance components and genetic parameters were obtained for birth, 205-d, and 365-d weight for Nelore cattle in Brazil, using single and multiple-trait animal models. Data were from the Brazilian Zebu Breeders Association (ABCZ). Records of 27,549 calves sired by 587 bulls and raised on pasture in 57 herds were analyzed by restricted maximum likelihood fitting an animal model including direct and maternal genetic and permanent environmental effects. Single and multiple- trait analyses were carried out. Heritability estimates for direct effects were lower than previous values reported for the Nelore breed. The estimates for maternal genetic effects showed that …
Effect Of Accounting For Different Phenotypic Variances By Sire Breed And Sex On Selection Of Sires Based On Expected Progeny Differences For 200- And 365-Day Weights, F. A. Rodriguez-Almeida, L. Dale Van Vleck, Larry V. Cundiff
Effect Of Accounting For Different Phenotypic Variances By Sire Breed And Sex On Selection Of Sires Based On Expected Progeny Differences For 200- And 365-Day Weights, F. A. Rodriguez-Almeida, L. Dale Van Vleck, Larry V. Cundiff
Department of Animal Science: Faculty Publications
The effects of accounting for different phenotypic variances according to sire breed and sex subclasses on estimation of sire breed effects and prediction of expected progeny differences of sires mated to Hereford and Angus cows were investigated. Data consisted of 6,977 and 6,530 records of 200-d (weaning) and 365-d (yearling) weights, respectively, of F1 calves sired by bulls (662 and 661, respectively) of 23 breeds that have been evaluated in the Germ Plasm Evaluation Program at the U.S. Meat Animal Research Center, Clay Center, NE. Models compared included fixed effects of genetic group of sire (samples of sires evaluated …
Heterogeneity Of Variance By Sire Breed, Sex, And Dam Breed In 200- And 365-Day Weights Of Beef Cattle From A Top Cross Experiment, F. A. Rodriguez-Almeida, L. Dale Van Vleck, Larry V. Cundiff, Stephen D. Kachman
Heterogeneity Of Variance By Sire Breed, Sex, And Dam Breed In 200- And 365-Day Weights Of Beef Cattle From A Top Cross Experiment, F. A. Rodriguez-Almeida, L. Dale Van Vleck, Larry V. Cundiff, Stephen D. Kachman
Department of Animal Science: Faculty Publications
The nature of the heterogeneity of variance for 200- and 365-d weights by sex, sire breed, and dam breed subclasses was studied. Data consisted of records for weaning f n = 7,829) and yearling (n = 7,367) weights of progeny from 673 and 672 sires, respectively, from 22 breeds that have been evaluated in the Germ Plasm Evaluation Program at the U.S. Meat Animal Research Center, Clay Center, NE. Sires were mated to Hereford and Angus cows. Each trait was analyzed separately. Three studies were undertaken separately to investigate heterogeneity due to the different factors (i.e, sire breed, sex, or …
Prediction Of Genetic Values Of Sires For Growth Traits Of Crossbred Cattle Using A Multivariate Animal Model With Heterogeneous Variances, R. Nunez-Dominguez, L. Dale Van Vleck, Larry V. Cundiff
Prediction Of Genetic Values Of Sires For Growth Traits Of Crossbred Cattle Using A Multivariate Animal Model With Heterogeneous Variances, R. Nunez-Dominguez, L. Dale Van Vleck, Larry V. Cundiff
Department of Animal Science: Faculty Publications
The purpose of this study was to evaluate the effect of adjusting for heterogeneous variances across breed groups on prediction of breeding values (PBV) of selected sires and on breed of sire effects. Data on weights at birth (BWT), 200 d (WW), and 365 d (YW) of purebred and crossbred calves from matings of Angus (A), Hereford (H), Polled Hereford, Charolais, Shorthorn, Simmental, Limousin, Maine-Anjou, Chianina, Gelbvieh, Tarentaise, and Salers bulls to A and H cows were used. Calf performance in H and A dams was treated as a different trait. Models compared included fixed birth year, cow age, and …
Estimation Of Non-Additive Genetic Variances In Three Synthetic Lines Of Beef Cattle Using An Animal Model, F. A. Rodriguez-Almeida, L. Dale Van Vleck, R. A. Willham, S. L. Northcutt
Estimation Of Non-Additive Genetic Variances In Three Synthetic Lines Of Beef Cattle Using An Animal Model, F. A. Rodriguez-Almeida, L. Dale Van Vleck, R. A. Willham, S. L. Northcutt
Department of Animal Science: Faculty Publications
Dominance and additive x additive genetic variances were estimated for birth and weaning traits of calves from thee synthetic lines of beef cattle differing in mature size. Data consisted of 3,992 and 2,877 records from lines of small-, medium-, and large-framed calves in each of two research herds located at Rhodes and McNay, IA, respectively. Variance components were estimated separately by herd and line for birth weight (BWT), birth hip height (BH), 205-d weight (WW), and 205-d hip height (WH) by derivative-free REML with an animal model. Model 1 included fixed effects of year, sex, and age of dam. Random …