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Milk trait heritability and correlation with heterozygosity in yak

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Jiang X. P., Liu G. G., Wang C., Mao Y. J., Xiong Y. Z.

Journal of Applied Genetics

2004

vol. 45

issue 2

215-224

382 yak cows were examined for milk yield, fat, protein and lactose contents. Six polymorphic loci, s1-CN, -CN, -CN, -Lg, -La and MUC-1, were scored by PAGE electrophoresis for each individual. The values of milk yield, fat, protein and lactose content were 247.13 kg, 5.81%, 5.18% and 4.93%, respectively. Based on the 6 polymorphism loci, the average heterozygosity of the yak population was 0.1794. Calculated by the marker-based method, heritability estimates for milk yield, fat, protein and lactose contents were 0.353 ? 0.093, 0.316 ? 0.101, 0.415 ? 0.098 and 0.481 ? 0.035, respectively. The relatively high or medium heritability of these traits indicate that it is feasible to rely directly on them in breeding for the improvement in a relatively short period. The significant linear regression between heterozygosity and fat percentage with a positive slope (R = 0.0420) indicated that inbreeding affected milk fat content in this population.

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1 Journal of Applied Genetics

1 2004

1 Jiang X. P.

1 Liu G. G.

1 Mao Y. J.

1 Wang C.

1 Xiong Y. Z.

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Milk trait heritability and correlation with heterozygosity in yak