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Effect of leptin gene polymorphism on the breeding value of milk production traits in Iranian Holstein

Published online by Cambridge University Press:  01 July 2008

M. Sadeghi ,
M. Moradi Shahr Babak ,
G. Rahimi  and
A. Nejati Javaremi
M. Sadeghi*
Affiliation:
Department of Animal Science, Faculty of Agriculture, University of Tehran, Karaj, Iran
M. Moradi Shahr Babak
Affiliation:
Department of Animal Science, Faculty of Agriculture, University of Tehran, Karaj, Iran
G. Rahimi
Affiliation:
Department of Animal Science, Faculty of Agriculture, University of Mazandaran, Sari, Iran
A. Nejati Javaremi
Affiliation:
Department of Animal Science, Faculty of Agriculture, University of Tehran, Karaj, Iran
*
E-mail: [email protected]
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Abstract

New molecular techniques focused on genome analysis, open new possibilities for more accurate evaluation of economiclly important traits in farm animals. Milk production traits are typical quantitative characteristics controlled by a number of genes. Mutations in their sequences may alter animal performance as well as their breeding values. In this study, we investigated the effect of Kpn2I restriction fragment length polymorphisms in the leptin gene, on bull breeding values for milk yield, fat, and protein yield, and their percentage. In order to test for an association between the leptin single-nucleotide polymorphism in exon 2 and milk productivity, we genotyped 134 Iranian Holstein bulls. Breeding values for milk-related traits (milk yield, fat, and protein yield and percentage) were estimated using the BLUP based on an animal model. The effect of the genotypes of Kpn2I polymorphism on the breeding values for milk-related traits was examined using least square methods. The T allele frequency was 0.425. Genotypes were distributed according to the Hardy-Weinberg equilibrium. Bulls with TT genotype had higher milk, fat and protein yield compared with TC and CC bulls (P < 0.05). Bulls with CC genotype had higher protein percentage compared with TT and TC bulls (P < 0.05). The association between leptin polymorphism with milk production traits suggests that this marker may be useful for selection based on molecular information.

Keywords

leptin genepolymorphismmilk productionholstein
Type
Full Paper
Information
animal , Volume 2 , Issue 7 , July 2008 , pp. 999 - 1002
Copyright
Copyright © The Animal Consortium 2008

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