Abstract

Cheese quality and quantity is higher for milk derived from cows with the BB genotypes for /J-lactoglobulin and /c-casein. Selection for these loci can only be justified if producers are paid accordingly, which requires genotype determination in commercial populations. A method is presented in which producers will be paid according to expected cow genotype based on sire and maternal grandsire genotypes. In populations with extensive artificial insemination (Al), most cows are progeny of a much smaller number of sires. Thus the total number of genotypings required will be economically insignificant. Variances of expected allele frequencies of cows were close to the values postulated by the variances of sire genotypes. Assuming that the economic benefit of the BB genotype over the AA genotypes are 4% for yff-lactoglobulin and 5% for /c-casein, selection on the economically optimum index for ten years will result in increases of 2 and 1 % in the frequencies of the desirable alleles, respectively for these loci, with virtually no reduction in genetic gains for production traits. The value of this gain for the Israeli Holstein population is $187,000/yr.
 

E. Ezra, M. Ron, E. Feldmesser, J. I Weller

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 19. Selection and quantitative genetics; growth; reproduction; lactation; fish; fiber; meat., , 327–330, 1994
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