Author: Sandra L. Senneke
Publisher:
ISBN:
Category :
Languages : en
Pages : 206
Book Description
Effects of Sire Misidentification on Estimates of Genetic Parameters for Birth Weight and Weaning Weight in Hereford Cattle
Estimation of Genetic and Environmental Parameters of Weaning Weight and Weaning Grade in Hereford Cattle
Author: Kurt Eberhard Sittmann
Publisher:
ISBN:
Category :
Languages : en
Pages : 322
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 322
Book Description
Genetic Parameters For Docility, Weaning Weight, Yearling Weight And Intramuscular Fat Percentage In Hereford Cattle
Author: José Antonio Torres Vázquez
Publisher:
ISBN:
Category :
Languages : en
Pages : 52
Book Description
Temperament in cattle can be described as the reactivity or fear response to human handling, and it is important to beef cattle producers not only from a human safety but also due to potential correlations with other economically traits. Before a docility selection metric can be added to a genetic evaluation, any potential antagonisms with economically relevant traits should be quantified. The objective was to estimate genetic parameters, including genetic correlations, for chute score (CS), weaning weight (WW), yearling weight (YW), and intramuscular fat percentage (IMF) in Hereford cattle. Single-trait and bivariate animal models were used to estimate heritabilities and genetic correlations. Models included fixed effects of sex and contemporary group, defined as herd–year–season. Direct genetic and residual components were included as random effects. For CS and WW, also additional random effects of maternal genetic and maternal permanent environment were fitted. For CS, WW, YW, and IMF, heritability estimates were 0.27 ± 0.02, 0.35 ± 0.03, 0.36 ± 0.02, and 0.27 ± 0.02, respectively. Genetic correlations between CS and WW, CS and YW, CS and IMF, WW and YW, WW and IMF, and YW and IMF were –0.12 ± 0.06, –0.10 ± 0.05, –0.08 ± 0.06, 0.47 ± 0.05, –0.19 ± 0.09, and –0.41 ± 0.05, respectively. Heritability estimates for all traits suggest that they would respond favorably to selection, although the selection for increased WW or YW could decrease marbling, which is often associated with favorable meat quality. Genetic correlations between CS and WW, YW, and IMF were all favorable but weak, suggesting that selection for improved docility will not have negative consequences on growth or meat quality. Maternal additive and maternal permanent environmental variances for CS were close to zero, suggesting that their inclusion in National Cattle Evaluations is not warranted.
Publisher:
ISBN:
Category :
Languages : en
Pages : 52
Book Description
Temperament in cattle can be described as the reactivity or fear response to human handling, and it is important to beef cattle producers not only from a human safety but also due to potential correlations with other economically traits. Before a docility selection metric can be added to a genetic evaluation, any potential antagonisms with economically relevant traits should be quantified. The objective was to estimate genetic parameters, including genetic correlations, for chute score (CS), weaning weight (WW), yearling weight (YW), and intramuscular fat percentage (IMF) in Hereford cattle. Single-trait and bivariate animal models were used to estimate heritabilities and genetic correlations. Models included fixed effects of sex and contemporary group, defined as herd–year–season. Direct genetic and residual components were included as random effects. For CS and WW, also additional random effects of maternal genetic and maternal permanent environment were fitted. For CS, WW, YW, and IMF, heritability estimates were 0.27 ± 0.02, 0.35 ± 0.03, 0.36 ± 0.02, and 0.27 ± 0.02, respectively. Genetic correlations between CS and WW, CS and YW, CS and IMF, WW and YW, WW and IMF, and YW and IMF were –0.12 ± 0.06, –0.10 ± 0.05, –0.08 ± 0.06, 0.47 ± 0.05, –0.19 ± 0.09, and –0.41 ± 0.05, respectively. Heritability estimates for all traits suggest that they would respond favorably to selection, although the selection for increased WW or YW could decrease marbling, which is often associated with favorable meat quality. Genetic correlations between CS and WW, YW, and IMF were all favorable but weak, suggesting that selection for improved docility will not have negative consequences on growth or meat quality. Maternal additive and maternal permanent environmental variances for CS were close to zero, suggesting that their inclusion in National Cattle Evaluations is not warranted.
Evaluation of Response to Selection and Inbreeding in a Closed Line of Hereford Cattle
Author: J. S. Brinks
Publisher:
ISBN:
Category : Agriculture
Languages : en
Pages : 40
Book Description
Publisher:
ISBN:
Category : Agriculture
Languages : en
Pages : 40
Book Description
Moment-type Estimation of Genetic Parameters and Their Variances for Calving Date and Production Traits from Hereford Data Using Multi-way Models
Author: Edward J. Otieno-Rege
Publisher:
ISBN:
Category :
Languages : en
Pages : 424
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 424
Book Description
Investigation of Sire by Breed of Dam Interaction Within Percentage Simmental Groups for Birth Weight and 205D Weight in the U.S. Simmental Population
Author: Bruce Edward Cunningham
Publisher:
ISBN:
Category : Cattle
Languages : en
Pages : 322
Book Description
Publisher:
ISBN:
Category : Cattle
Languages : en
Pages : 322
Book Description
Parameter Estimation for Carcass Traits Including Growth Information of Simmental Beef Cattle Using Restricted Maximum Likelihood with a Multiple-trait Model
Author: Brent Wayne Woodward
Publisher:
ISBN:
Category :
Languages : en
Pages : 296
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 296
Book Description
Direct and Maternal Genetic Parameter Estimates for Individual Birth Weight, Weaning Weight and Probe Weight of Yorkshire and Landrace Pigs
Direct and Maternal Effects on Preweaning Characters of Brahman, Hereford and Brahman-Hereford Crossbred Cattle
Author: Rodney Lee Roberson
Publisher:
ISBN:
Category : Cattle
Languages : en
Pages : 238
Book Description
Publisher:
ISBN:
Category : Cattle
Languages : en
Pages : 238
Book Description