Data/hora: 14/06/2024 04:11:20

Biblioteca(s): | Embrapa Cerrados.
Data corrente: | 18/03/2003
Data da última atualização: | 18/03/2003
Autoria: | MAGNABOSCO, C. D. U.; OJALA, M.; LOS REYES, A. de; SAINZ, R. D.; FERNANDES, A.; FAMULA, T. R.
Título: | Estimates of environmental effects and genetic parameters for body measurements and weight in Brahaman cattle raised in Mexico.
Ano de publicação: | 2002
Fonte/Imprenta: | Journal of Animal Breeding and Genetics, Berlin, v. 119, p. 221-228, 2002.
Idioma: | Inglês
Conteúdo: | A Derivative Free Restricted Maximum Likelihood (DFREML) algorithm was used with single trait and two animal models to estimate the variance and covariance components and thus, heritabilities and phenotypic, genetic and environmental correlations among nine different body measurements and weights of Brahman cattle raised in Mexico. The following measurements were considered: hip width, pin width, hip-pin width, anterior height, posterior height, body lenght, thorax perimeter, scrotal, circumference and weight. The analysis was based on a total of 1018 animals, born between 1992 and 1995, from 17 herds in the Mexico States of Chiapas, San Luis Potosi, Tabasco, Tamaulipas and Veracruz. The model included the following fixed effects: herd, year-season of birth, sex, age of the animal and feed management. The only random effect was the direct additive genetic contribuition of each animal. All fixed effects in the model were significant for all traits (p<0.05). Estimated heritabilities for the traits were: hip width 0.57, pin width 0.32, hip-pin width 0.41, anterior height 0.56, posterior height 0.54, body lenght 0.32, thorax perimeter 0.49, scrotal circumference 0.02 and weigth 0.66. The magnitude of the heritabilities was medium to high, with the exception of scrotal circumference. The genetic correlations among all body measurements were consistently positive and high, ranging from 0.64 to 1.00. Although other measures showed higher genetic correlations with weight, thorax perimeter combines a high value (0.70) with ease and repeatability, making it a useful field measurement to estimate body weight when scales are not available.
Thesagro: | Bovino; Cerrado; Gado; Genética.
Categoria do assunto: | --
Registro original: | Embrapa Cerrados (CPAC)
Exemplares: | CPAC - (23117-1) - UPC - SP - -- - CRI6238 -  - CRI6238 - DIS