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Myostatin (GDF-8) is a key protein responsible for skeletal muscle growth and development so mutations in the mstn gene can have major economic and breeding consequences. The aim of the present study was to investigate polymorphism in the 5’flanking region of the mstn gene and its possible influence on the myostatin level in skeletal muscles of Polish Black-and-White bulls. The relation between expression...
Polish Red (PR) is the native Polish cattle breed included in the FAO National Rare Livestock Breeds Preservation Programme. The breed is characterized by high vitality and fertility, calving ease, resistance to diseases, and low requirements for feed. Milk yield is low, but fat and protein content of milk are high. The frequencies of alleles of commonly studied loci as well as the presence of new...
The effects of cow’s genotype at αS1- and αS2-casein gene 5’-noncoding regions (promoters) were determined on selected milk production traits of the 135 Polish Black-and-White (Polish Friesian) cows as related to the animal’s age, lactation parity and stage, and somatic cell count. Cows of the AA genotype of αS1-casein gene yielded more milk daily than AG heterozygotes. Also, the daily yield of solids-non-fat,...
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