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Genetic and Economic Implications of Selecting for Milk Protein¹

Department of Dairy and Animal Science, The Pennsylvania State University, University Park 16802

ABSTRACT

Genetic and phenotypic parameters from Holsteins were used to estimate genetic and economic implications of including milk protein in the pricing system. Postulated variable market values were used to construct selection indexes with and without selection for protein content by the dairyman. Nine combinations of three fat values and three protein values along with a tenth case, where all market value was assigned to protein and fat content, were investigated.

Responses in percentages of fat and protein were always of the same sign within a market scheme, and usually of opposite sign to the response in carrier (milk minus yields of fat and protein). Only when component values exceeded 42% of the total market price did percentages of fat and protein increase with index selection. Selection indexes based on carrier and fat percentage only were from 91 to 100% as effective as the three trait indexes.

¹ Journal No. 5930, Pennsylvania Agricultural Experiment Station, The Pennsylvania State University, University Park 16802.

² Institute of Zootechnical Research of WAKWA, B. P 65, Ngaoundere, Cameroon, West Africa.