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Estimates of co(variance) component and genetics parameters for growth traits in Avikalin sheep

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Title Estimates of co(variance) component and genetics parameters for growth traits in Avikalin sheep
 
Creator L. Leslie Leo Prince
G R Gowane
Ashish chopra
A L Arora
 
Subject Avikalin
Genetic parameter
Growth
 
Description Not Available
(Co)variance components and genetic parameters for various growth traits of Avikalin sheep maintained at Central Sheep and Wool Research Institute, Avikanagar, Rajasthan, India, were estimated by Restricted Maximum Likelihood, fitting six animal models with various combinations of direct and maternal effects. Records of 3,840 animals descended from 257 sires and 1,194 dams were taken for this study over a period of 32 years (1977–2008). Direct heritability estimates (from best model as per likelihood ratio test) for weight at birth, weaning, 6 and 12 months of age, and average daily gain from birth to weaning, weaning to 6 months, and 6 to 12 months were 0.28 ± 0.03, 0.20 ± 0.03, 0.28 ± 0.07, 0.15 ± 0.04, 0.21 ± 0.03, 0.16 and 0.03 ± 0.03, respectively. Maternal heritability for traits declined as animal grows older and it was not at all evident at adult age and for post-weaning daily gain. Maternal permanent environmental effect (c 2) declined significantly with advancement of age of animal. A small effect of c 2 on post-weaning weights was probably a carryover effect of pre-weaning maternal influence. A significant large negative genetic correlation was observed between direct and maternal genetic effects for all the traits, indicating antagonistic pleiotropy, which needs special care while formulating breeding plans. A fair rate of genetic progress seems possible in the flock by selection for all traits, but direct and maternal genetic correlation needs to be taken in to consideration.
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Date 2021-07-24T05:44:34Z
2021-07-24T05:44:34Z
2010-09-01
 
Type Article
 
Identifier L. L. L. Prince, G. R.Gowane, A. Chopra and A.L. Arora. (2010) Estimates of co(variance) component and genetics parameters for growth traits in Avikalin sheep. Tropical Animal Health and Production: 42(6): 1093-1101.
0049-4747
http://krishi.icar.gov.in/jspui/handle/123456789/49686
 
Language English
 
Relation Not Available;
 
Publisher SPringer Link