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Estimates of genetic and phenotypic parameters for growth traits of D'Man lambs

Published online by Cambridge University Press:  02 September 2010

I. Boujenane  and
M. Kerfal
I. Boujenane
Affiliation:
Department of Animal Production, Hassan II Agronomy and Veterinary Institute, BP 6202 Rabat-Instituts, Morocco
M. Kerfal
Affiliation:
National Institute of Agricultural Research, Errachidia, Morocco
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Abstract

The heritability of growth traits from birth to 6 months of age and the genetic and phenotypic correlations among them were determined from paternal half-sib analyses of 1689 records of D'man lambs. Heritability estimates were 0·34 (s.e. 0·08), 0·23 (s.e. 0·06), 0·52 (s.e. 0·10) and 0·43 (s.e. 0·09) for weights at birth, 30 days, 90 days and 180 days, respectively. Heritabilities for average daily gains from birth to 30 days and from 30 to 90 days were estimated to be 0·12 (s.e. 0·05) and 0·56 (s.e. 0·11), respectively. Genetic and phenotypic correlations among growth traits were all positive and of high magnitude. The former estimates varied from 0·66 to 0·98, the latter estimates ranged from 0·23 to 0·92. Selection for high weight at 90 days would be expected to have large effect on other growth traits as a result of their large positive genetic correlations.

Keywords

genetic correlationsgrowth traitsheritabilitylambsphenotypic correlation
Type
Research Article
Information
Animal Production , Volume 51 , Issue 1 , August 1990 , pp. 173 - 178
Copyright
Copyright © British Society of Animal Science 1990

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