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Full-Text Articles in Life Sciences
Heritability Estimates For Carcass Traits Of Cattle: A Review, Angel Rios Utrera, L. Dale Van Vleck
Heritability Estimates For Carcass Traits Of Cattle: A Review, Angel Rios Utrera, L. Dale Van Vleck
Department of Animal Science: Faculty Publications
We present estimates of heritability for carcass traits of cattle published in the scientific literature. Seventy-two papers published form 1962 to 2004, which reported estimates of heritability for carcass traits, were reviewed. The unweighted means of estimates of heritability for 14 carcass traits by slaughter end point (age, weight, and fat depth) were calculated. Among the three end points, carcass weight, backfat thickness, longissimus muscle area, and marbling score were the carcass traits with the most estimates of heritability (56≤n≤66). The averages for these traits indicate that they are similarly and moderately heritable (0.40, 0.36, 0.40, and 0.37, respectively). However, …
Genetic Relationships Between Sex-Specific Traits In Beef Cattle: Mature Weight, Weight Adjusted For Body Condition Score, Height And Body Condition Score Of Cows, And Carcass Traits Of Their Steer Relatives, K. A. Nephawe, L. V. Cundiff, M. E. Dikeman, J. D. Crouse, L. Dale Van Vleck
Genetic Relationships Between Sex-Specific Traits In Beef Cattle: Mature Weight, Weight Adjusted For Body Condition Score, Height And Body Condition Score Of Cows, And Carcass Traits Of Their Steer Relatives, K. A. Nephawe, L. V. Cundiff, M. E. Dikeman, J. D. Crouse, L. Dale Van Vleck
Department of Animal Science: Faculty Publications
Data from the first four cycles of the Germplasm Evaluation Program at the U.S. Meat Animal Research Center (USMARC) were used to investigate genetic relationships between mature weight (MW, n = 37,710), mature weight adjusted for body condition score (AMW, n = 37,676), mature height (HT, n = 37,123), and BCS (n = 37,676) from 4- to 8-yr old cows (n = 1,800) and carcass traits (n = 4,027) measured on their crossbred paternal half-sib steers. Covariance components among traits were estimated using REML. Carcass traits were adjusted for age at slaughter. Estimates of heritability for hot carcass weight (HCWT); …
Genetic Response To Selection For Weaning Weight Or Yearling Weight Or Yearling Weight And Muscle Score In Hereford Cattle: Efficiency Of Gain, Growth, And Carcass Characteristics, R. M. Koch, L. V. Cundiff, K. E. Gregory, L. Dale Van Vleck
Genetic Response To Selection For Weaning Weight Or Yearling Weight Or Yearling Weight And Muscle Score In Hereford Cattle: Efficiency Of Gain, Growth, And Carcass Characteristics, R. M. Koch, L. V. Cundiff, K. E. Gregory, L. Dale Van Vleck
Department of Animal Science: Faculty Publications
An experiment involving crosses among selection and control lines was conducted to partition direct and maternal additive genetic response to 20 yr of selection for 1) weaning weight, 2) yearling weight, and 3) index of yearling weight and muscle score. Selection response was evaluated for efficiency of gain, growth from birth through market weight, and carcass characteristics. Heritability and genetic correlations among traits were estimated using animal model analyses. Over a time-constant interval, selected lines were heavier, gained more weight, consumed more ME, and had more gain/ME than the control. Over a weight-constant interval, selected lines required fewer days, consumed …
Effect Of Box-Cox Transformation On Genetic Parameter Estimation In Layers, Yakut Ünver, Yavuz Akbaş, İsmai̇l Oğuz
Effect Of Box-Cox Transformation On Genetic Parameter Estimation In Layers, Yakut Ünver, Yavuz Akbaş, İsmai̇l Oğuz
Turkish Journal of Veterinary & Animal Sciences
The purpose of the study was to investigate the effects of Box-Cox transformation on estimations of the genetic parameters for egg production traits that do not hold to the assumptions of parametric statistical analysis. Egg production of 1980 animals from 43 sires and 8 dams per sire were used. Five partial record periods were considered: 22-30 weeks of age, 31-34 weeks of age, 22-34 weeks of age, 31-40 weeks of age and 22-40 weeks of age. The egg production traits showed non-normal distributions in the form of negative skewness and positive kurtosis. The greatest departure from normality was observed in …
Estimation Of Genetic Parameters And Correlations For The First Three Lactation Milk Yields In Holstein Friesian Cattle By The Reml Method, Adnan Ünalan, Zeynel Cebeci̇
Estimation Of Genetic Parameters And Correlations For The First Three Lactation Milk Yields In Holstein Friesian Cattle By The Reml Method, Adnan Ünalan, Zeynel Cebeci̇
Turkish Journal of Veterinary & Animal Sciences
In this study, 3484 milk yield records (1520 first, 1206 second and 758 third lactations) obtained from 1816 cows born between 1990 and 1997 in the Holstein-Friesian herd of Ceylanpınar State Farm were used to estimate the heritabilities, and genetic and phenotypic correlations between lactation milk yields using an individual animal model and the restricted maximum likelihood (REML) method. In the model studied, 305-day milk yields were used and individual animal effects were assumed to be a random effect, calving year and calving months were fixed effects, and calving age (as months) was a covariate, and all of these factors …