The effect of the a,]-casein polymorphism on protein, fat and dry matter contents in milk, rheological parameters (coagulation time, K20, A30 and curd yield capacity), measured with a Formagraph©, and cheese yield, have been studied in a Spanish breed (Malaguena). Other factors (herd, age, kidding season, lactation number) and covariables (days in lactation, pH and somatic cell counts) have been taken into account. The effect of the -casein polymorphism was significant for protein and effective dry matter (protein plus fat) contents in milk. It also showed an influence on curd yield capacity, which is a parameter very related to cheese yield. Results are compared with those observed in French Alpina and Saanen and they are discussed in relation with the differences of allele frequencies and environmental conditions between these breeds

A. Sanchez, C. Angulo, M. Amills, J. L Ares, J. M Serradilla

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 24: Sheep and goats (fibre); sheep and goats (meat and milk); poultry; horses; buffaloes., , 242–245, 1998
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