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Genetic and phenotypic parameters of some measures of lifetime production and their relationship with milk yield in the first three lactations in Tharparkar cows

Published online by Cambridge University Press:  27 March 2009

V. K. Taneja ,
S. B. Basu  and
D. S. Bhatnagar
V. K. Taneja
Affiliation:
Division of Dairy Cattle Genetics and Breeding, National Dairy Research Institute, Karnal (Haryana), India
S. B. Basu
Affiliation:
Division of Dairy Cattle Genetics and Breeding, National Dairy Research Institute, Karnal (Haryana), India
D. S. Bhatnagar
Affiliation:
Division of Dairy Cattle Genetics and Breeding, National Dairy Research Institute, Karnal (Haryana), India
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Summary

The genetic parameters of lifetime production traits and their relationship with milk yield in first, second and third lactations were estimated from information on 753 Tharparkar cows. The heritability estimates for milk yield in first, second and third lactations were 0·22 ± 0·10, 0·33 ± 0·14 and 0·49 ± 0·17 and for number of lactations completed, lifetime milk production, number of days in milk and herd life 0·58 ± 0·23, 0·51 ± 0·22, 0·54 ± 0·22 and 0·34 ± 0·20 respectively. The genetic and phenotypic correlations among the four lifetime production traits were in the range of 0·83–1·0 and 0·84–0·85 respectively. The phenotypic correlations of milk yield in first, second and third lactations with lifetime production traits were significant and ranged between 0·15 and 0·56. The corresponding genetic correlations ranged between 0·26 and 0·83. For the first three lactations, the genetic correlations of lifetime traits with the third lactation were high and that between lifetime milk yield and yield in third lactation the highest (0·83 ± 0·17). The direct and correlated responses from single trait selection were also estimated.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 98 , Issue 2 , April 1982 , pp. 461 - 465
Copyright
Copyright © Cambridge University Press 1982

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