Author: Janice M. Rumph
Publisher:
ISBN:
Category :
Languages : en
Pages : 126
Book Description
A Comparison of Models Used for Estimation of Genetic Parameters for Mature Weight of Hereford Cattle
Estimation of Genetic Parameters for Mature Weight in Hereford Females
Author: Thomas Gordon Field
Publisher:
ISBN:
Category : Beef cattle
Languages : en
Pages : 118
Book Description
Publisher:
ISBN:
Category : Beef cattle
Languages : en
Pages : 118
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
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.
Index Medicus
Author:
Publisher:
ISBN:
Category : Medicine
Languages : en
Pages : 2036
Book Description
Vols. for 1963- include as pt. 2 of the Jan. issue: Medical subject headings.
Publisher:
ISBN:
Category : Medicine
Languages : en
Pages : 2036
Book Description
Vols. for 1963- include as pt. 2 of the Jan. issue: Medical subject headings.
Proceedings
Author: Beef Improvement Federation. Research Symposium & Annual Meeting
Publisher:
ISBN:
Category : Beef cattle
Languages : en
Pages : 216
Book Description
Publisher:
ISBN:
Category : Beef cattle
Languages : en
Pages : 216
Book Description
Estimates of Genetic Parameters Necessary for Constructing Selection Indexes for Beef Cattle
Author: Lee Evans
Publisher:
ISBN:
Category : Beef cattle
Languages : en
Pages : 110
Book Description
Publisher:
ISBN:
Category : Beef cattle
Languages : en
Pages : 110
Book Description
Guidelines for Uniform Beef Improvement Programs
Author: Dixon D. Hubbard
Publisher:
ISBN:
Category : Beef
Languages : en
Pages : 84
Book Description
Publisher:
ISBN:
Category : Beef
Languages : en
Pages : 84
Book Description