The possibilities of modifing milk composition by breeding in dairy cattle were studied. Profit equation were used by calculating net economic value of milk components. Net economic values for milk, fat and protein yield were estimated to derive economic indices for the case of no milk quota. The net economic values for carrier and weighting factor for milk in the index were only positive when milk was paid for its volume. In all casses, genetic responses for milk fat and protein were high. Introduction of a no payment for carrier in addition to a payment for fat andprotein resulted in slightly higher response of the protein yield if the ratio of fatrprotein was 1:3. In general, a selection based on economic indices for milk, fat and protein yield, is insensitive to a large range of real or expected prices for fat and protein.

Johan AM van Arendonk, R. S Spelman, E. H van der Waaij, Piter Bijma, Henk Bovenhuis

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 25: Lactation; growth and efficiency; meat quality; role of exotic breeds in the tropics; design of village breeding programs; n, , 407–414, 1998
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