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J Biosci ; 2005 Dec; 30(5): 595-8
Artículo en Inglés | IMSEAR | ID: sea-110971

RESUMEN

Associations were analysed between polymorphisms of the growth hormone gene (GH-MspI) (localized in intron 3) and milk production traits of Beijing Holstein cows (a total of 543 cows). Polymerase chain reaction (PCR)-restriction fragment length polymorphism (RFLP) method was used for identification of various genotypes. Frequencies of genotypes were 0.77, 0.21 and 0.02 for A/A, A/B and B/B, respectively. The frequency of the GH A allele is 0.875. The results of the least squares means show that in all three lactations, the GH A/A cows yielded more milk (P less than 0.01 for lactation I and P less than 0.05 for lactations II and III), whereas A/B cows showed higher milk fat content than A/A individuals (P less than 0.05 for lactations I and II, and P less than 0.01 for lactation III). The A/A cows yielded more fat than A/B individuals (P less than 0.01 only in lactation I). The A/A cows yielded more milk protein than A/B individuals (P less than 0.01 for lactations I, II, and III). The A/A cows produced milk of higher protein content than of A/B individuals (P less than 0.05 only in lactation II).


Asunto(s)
Animales , Bovinos/genética , Desoxirribonucleasa HpaII/metabolismo , Grasas de la Dieta/análisis , Femenino , Frecuencia de los Genes , Genotipo , Hormona del Crecimiento/genética , Lactancia/genética , Leche/química , Proteínas de la Leche/análisis , Reacción en Cadena de la Polimerasa/veterinaria , Polimorfismo Genético/fisiología , Polimorfismo de Longitud del Fragmento de Restricción
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