Milk protein polymorphisms in Holstein cattle


Oner Y., Elmaci C.

INTERNATIONAL JOURNAL OF DAIRY TECHNOLOGY, vol.59, no.3, pp.180-182, 2006 (Peer-Reviewed Journal) identifier identifier

  • Publication Type: Article / Article
  • Volume: 59 Issue: 3
  • Publication Date: 2006
  • Doi Number: 10.1111/j.1471-0307.2006.00259.x
  • Journal Name: INTERNATIONAL JOURNAL OF DAIRY TECHNOLOGY
  • Journal Indexes: Science Citation Index Expanded, Scopus
  • Page Numbers: pp.180-182
  • Keywords: genetic polymorphism, Holstein cattle, milk protein, GENETIC-POLYMORPHISM, BETA-LACTOGLOBULIN, DAIRY-CATTLE, PRODUCTION TRAITS, COWS MILK, CASEIN, VARIANTS, ASSOCIATION, LOCI

Abstract

Milk samples from 203 Holstein cows were phenotyped for genetic variants alpha(s1)-casein, beta-casein, kappa-casein and beta-lactoglobulin using starch-gel electrophoresis. All of the four milk protein loci exhibited polymorphism with allele frequencies of 0.862 +/- 0.017 for alpha(s1)-casein B, 0.966 +/- 0.0009 for beta-casein A, 0.712 +/- 0.0224 for kappa-casein A and 0.567 +/- 0.0245 for beta-lactoglobulin B. The mean heterozygosity estimated over all the four milk protein loci was 0.3015. Genetic equilibrium was observed among all of the loci investigated, except kappa-casein. Chi-squared tests revealed that there was no significant linkage among studied milk protein phenotypes.