Genetics of milk protein polymorphism and its relation to milk yield traits in Holstein cows


KAYGISIZ A., Dogan M.

TURKISH JOURNAL OF VETERINARY & ANIMAL SCIENCES, vol.23, pp.447-454, 1999 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 23
  • Publication Date: 1999
  • Title of Journal : TURKISH JOURNAL OF VETERINARY & ANIMAL SCIENCES
  • Page Numbers: pp.447-454

Abstract

The distribution and types of alpha-s(1)-casein, beta-lactoglobulin, beta-casein and kappa-casein in Holstein cattle were identified. It was determined that the frequencies of alpha-s(1)-casein were 0.958 and 0.042 for alpha-s(1)-Ka(B) and alpha-s(1)-Ka(C); beta-lactoglobulin, 0.516 and 0.484 for beta-lgn(A) and beta-lgn(B); beta-casein, 0.995 and 0.005 for beta-Ka(A) and beta-Ka(B): and kappa-casein, 0.677 and 0.323 for kappa-Ka(A) and kappa-Ka(B), respectively. The differences between the empirical and theoretical distributions of the alpha-s(1)-casein, beta-lactoglobulin, beta-casein and kappa-casein genotypes were not significant. The effects of the alpha-s(1)-casein, beta-casein and kappa-casein types on milk yield traits were not significant, while the effects of the beta-lactoglobulin types were significant (p<0.05). beta-Lgn(AB) type cows produced the highest 2x-ME-305 daily milk yields. The effects of alpha-s(1)-casein types on the length of the lactation period were not significant, while the effects of the beta-lactoglobulin. beta-casein and kappa-casein types were significant (P<0.05).
The distribution and types of alpha-s(1)-casein, beta-lactoglobulin, beta-casein and kappa-casein in Holstein cattle were identified.