Genetic variants of milk proteins show relationships with cheesemaking properties of milk. For that reason it is important to know to what extent present breeding strategies influence gene frequencies of milk protein variants. This paper gives an overview of literature on gene frequencies in different breeds and on methods used to estimate gene frequencies. Further, results are presented of a study to examine breed effects on gene frequencies of milk proteins and to examine fractions misclassified. Differences in gene frequencies of a8l-Cn and /c-Cn among Dutch Friesian and Holstein Friesian breeds were negligible, differences in fl-casein gene frequencies were rather large while smaller, differences were observed for the B-Lg gene frequencies. These results suggest no deterioration of cheese making properties by crossbreeding Dutch Friesian and Holstein Friesian breeds.

Henk Bovenhuis, S. Korver, A. JM Verstege

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XIV. Dairy cattle genetics and breeding, adaptation and conservation., , 136–139, 1990
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