Milk trait heritability and correlation with heterozygosity in yak

• Authors: X.P. Jiang , G.G. Liu , C. Wang , Y.J. Mao , Y.Z. Xiong
• Languages of publication: EN

Abstracts

EN

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.

Keywords

EN

HERITABILITY; MILK TRAIT; OVERDOMINANCE; YAK

Discipline

• GENETICS: GENETICS

• Journal: Journal of Applied Genetics
• Year: 2004
• Volume: 45
• Issue: 2
• Pages: 215-224

Contributors

author

X.P. Jiang

author

G.G. Liu

author

C. Wang

author

Y.J. Mao

author

Y.Z. Xiong

• Document Type: ARTICLE
• Publication order reference: X.P. Jiang, College of Animal Science and Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, P.R. China