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Environmental and genetic parameters of growth, reproductive and survival performance of Afar and blackhead Somali sheep at Werer Agricultural Research Centre, Ethiopia

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Title Environmental and genetic parameters of growth, reproductive and survival performance of Afar and blackhead Somali sheep at Werer Agricultural Research Centre, Ethiopia
 
Creator Yacob, Y.
 
Subject ENVIRONMENT
GENETICS
REPRODUCTION
SHEEP
SURVIVAL
ETHIOPIA
AFRICA
EAST AFRICA
GENETIC PARAMETERS
 
Description Data collected on flocks of Afar (1976 to 1991) and Black Head Somali (1977 to 1987) at Were research center were used to study the effect of environmental factors on ewe reproductive performance, lamb survival and early growth traits (Birth, weaning, six month and yearling and pre and post-weaning daily gain) in addition genetic analyses were carried out to estimate genetic parameters (heritability, repeatability and genetic and phenotypic correlations) for early growth traits. General linear model procedures were used in the non-genetic analysis using a linear model that included the effect of year, sex, type of birth, parity, ewe age, and ewe and sire body weights at mating and their possible interactions for all traits plus regressions on age at weaning, six-month and yearling weights. AIREML procedures were used to estimate variance covariance components and genetics parameters. The results indicated that year of birth, sex, breed, type of birth and parity of dam had significant (P>0.01) effect on all early growth traits studied, except that the effect of breed on pre-weaning included in the model as a covariate was significant (P0.05) but was only significant (P0.05) but was only significant (P
 
Date 2016-02-08T09:07:59Z
2016-02-08T09:07:59Z
2008
 
Type Conference Paper
 
Identifier http://hdl.handle.net/10568/70953
 
Language en