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Estimates of (co)variance components due to direct and maternal effects for lamb growth traits in Bharat Merino sheep

Indian Agricultural Research Journals

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Title Estimates of (co)variance components due to direct and maternal effects for lamb growth traits in Bharat Merino sheep
 
Creator GOWANE, G R
CHOPRA, ASHISH
PASWAN, CHANDAN
ARORA, A L
 
Subject Genetic parameters; Lamb growth traits; Maternal effects; Sheep
 
Description Estimates of (co)variance components were obtained for lamb growth traits in Bharat Merino sheep over a period of 17 years (1990–2006). Records of 2 630 lambs from 214 sires and 949 dams were used for this analysis. Data were analyzed by restricted maximum likelihood (REML), fitting an animal model ignoring or including maternal genetic and maternal permanent environment effect. Six different animal models were fitted for all traits. Overall additive genetic variability was very low in the flock for all the traits (h2 for birth, 3 and 6 month weight, ADG1 and ADG2 obtained from the best model were 0.06±0.02, 0.01±0.02, 0.01±0.01, 0.04±0.02 and 0.00, respectively). Maternal effects declined with the advancement of age. Partitioning of maternal effect into genetic and permanent environmental components was difficult. Correlation between direct and maternal genetic effect was high and negative. Complex models explained variation more efficiently than the simple models.
 
Publisher Directorate of Knowledge Management in Agriculture
 
Contributor ICAR
 
Date 2010-06-24
 
Type info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
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Format application/pdf
 
Identifier http://epubs.icar.org.in/ejournal/index.php/IJAnS/article/view/88
 
Source The Indian Journal of Animal Sciences; Vol 80, No 5 (2010)
0367-8318
 
Language eng
 
Relation http://epubs.icar.org.in/ejournal/index.php/IJAnS/article/view/88/88
 
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