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- Title
Genetic and phenotypic parameters for yearling weight, scrotal circumference and frame score in Simmental and Simbrah beef cattle from Mexico.
- Authors
Torres-Vázquez, José Antonio; Manzanilla Pech, Coralia Inés Valentina; Zepeda, Aurelio Borrayo; Ríos-Utrera, Ángel; Vega-Murillo, Vicente Eliezer; Martínez-Velázquez, Guillermo; Rodríguez, Juan José Baeza; Montaño-Bermúdez, Moisés
- Abstract
The objective of the present study was to estimate (co)variance components, heritabilities and genetic and phenotypic correlations for yearling weight (YW), scrotal circumference (SC) and frame score (FS) of Simmental and Simbrah young bulls from Mexico. All traits were adjusted to 365 d according to the Beef Improvement Federation (BIF). Final data file included 1,949 Simmental and 1,259 Simbrah records. A three-trait animal model was used to estimate (co)variance components and genetic parameters. For each trait, the model included fixed effects of herd-year-season, and the age of dam, gene proportion of Simmental breed, heterozygosity and recombination losses effects as covariates; animal and residual were included as random effects. Additive variances were 376.3±130.9 kg2, 2.89±0.69 cm2 and 0.37±0.08 units2; and heritabilities were 0.33±0.11, 0.35±0.08 y 0.42±0.08, for YW, SC and FS, respectively. Genetic correlations were 0.36±0.19, 0.47±0.17 and 0.59±0.12, for YW-SC, YW-FS and SC-FS, respectively. Heritability estimates show that a favorable response would exist to selection for the studied traits. Genetic correlations indicate that no genetic antagonisms exist, suggesting that would be a positive correlated response to selection of any trait. It would be necessary the use of selection indices in order to avoid greater FS as correlated response due to direct selection of YW and SC.
- Subjects
MEXICO; BEEF cattle; CATTLE genetics; BIRTH weight; ANALYSIS of covariance; ANIMAL models in research
- Publication
Revista Mexicana de Ciencias Pecuarias, 2012, Vol 3, Issue 3, p291
- ISSN
2007-1124
- Publication type
Article