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J. Dairy Sci. 87:3925-3927
© American Dairy Science Association, 2004.

Short Communication: Effect of Leptin Gene Polymorphisms on Breeding Value for Milk Production Traits

Z. Madeja, T. Adamowicz, A. Chmurzynska, T. Jankowski, J. Melonek, M. Switonski and T. Strabel

Department of Genetics and Animal Breeding, August Cieszkowski Agricultural University of Poznan, Poland

Corresponding author: Tomasz Strabel; e-mail: strabel{at}man.poznan.pl.

New molecular techniques focused on genome analysis open new possibilities for complex evaluation of economically 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 3 restriction fragment length polymorphisms (RFLP): HphI, Kpn2I, and Sau3AI in the leptin gene, on bull breeding values for milk, fat, and protein yield, and fat and protein content. One hundred seventeen Polish Black and White AI bulls were genotyped. Pedigree analysis indicated a relatively close relationship between the bulls. Statistical analysis indicated that the HphI polymorphism has a significant effect on milk and protein yield. Animals with the TT genotype had approximately 2x higher estimated breeding values for milk and protein yields. No effect was found for the other 2 polymorphisms.

Key Words: dairy cattle • leptin polymorphism • milk traits • breeding value

Abbreviation key: BTA = Bos taurus autosome.






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