Heritability estimates for carcass traits of cattle: a review
Genet. mol. res. (Online)
;
3(3): 380-394, 2004. tab
Artigo
em Inglês
| LILACS
| ID: lil-482170
ABSTRACT
We present estimates of heritability for carcass traits of cattle published in the scientific literature. Seventy-two papers published from 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 is less than or equal to "n", and "n" is less than or equal to 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, heritability estimates for most traits varied greatly, which could be due to differences in breed groups, methods of estimation, effects in the model, number of records, measurement errors, sex, and management. Few studies have compared heritability estimates for carcass traits adjusted to different end points. Results from such studies have been inconsistent, although some studies revealed that heritability estimates for several carcass traits are sensitive to the covariate included in the model for the end point, implying that direct response to selection would be different for some traits depending on slaughter end point. The effect of different end points on estimates of heritability for many carcass traits has not been studied.
Texto completo:
DisponíveL
Índice:
LILACS (Américas)
Assunto principal:
Bovinos
/
Músculo Esquelético
/
Característica Quantitativa Herdável
/
Desenvolvimento Muscular
Tipo de estudo:
Estudo prognóstico
Limite:
Animais
Idioma:
Inglês
Revista:
Genet. mol. res. (Online)
Assunto da revista:
Biologia Molecular
/
Genética
Ano de publicação:
2004
Tipo de documento:
Artigo
País de afiliação:
Estados Unidos
Instituição/País de afiliação:
USDA/US
/
University of Nebraska/US
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