Abstract: The effect of Kappa Casein (K-CN) gene polymorphism on milk yield (305 day yield) and some reproductive performance (number of service/conception, calving interval, open period and gestation period) was investigated using 237 Chinese Holstein cattle. The polymorphism of K-CN was detected by Polymerase Chain Reaction-Single Strand Conformation (PCR-SSCP) technique. The obtained results elucidated that K-CN genotypes did not affect (p>0.05) 305 day milk yield; cows with genotype TT produced slightly higher milk than those of TC and CC genotypes. However, the effect of K-CN genotypes on reproductive performance revealed that K-CN genotypes were not significant (p>0.05) for any traits.
A.E. Hamza, Z.P. Yang, X.L. Wang, R.J. Chen, H.T. Wu and A.I. Ibrahim, 2010. Kappa Casein Gene Polymorphism and its Impact on Milk Yield and Reproductive Performance Traits of Chinese Holstein Cattle. Agricultural Journal, 5: 283-285.