The impact of kappa casein gene polymorphism on milk components and other productive performance traits of Chinese Holstein cattle | [Pakistan Veterinary Journal • 2011]

Author(s):

1. Z. P. Yang: Animal Science & Technology College, Yangzhou University, Jiangsu, CHINA

2. X. L. Wang: Animal Science & Technology College, Yangzhou University, Jiangsu, CHINA

3. R. J. Chen: Animal Science & Technology College, Yangzhou University, Jiangsu, CHINA

4. H. T. Wu: Animal Science & Technology College, Yangzhou University, Jiangsu, CHINA

5. A. E. Hamza: College of Veterinary Science, Department of Animal Production, Nyala University, Nyala, SUDAN

6. A. I. Ibrahim: Department of Animal Production, Faculty of Agriculture, Sinnar University, Abu-Naama, SUDAN

Abstract:

Polymorphism of kappa casein gene (κ-Cn) at exon 5 in 259 Chinese Holstein cattle was investigated using polymerase chain reaction-single strand conformation (PCR-SSCP) technique, to verify its effect on milk composition (fat, protein, lactose, total solids (TS) and solids not fat (SNF) content and influence of other factors such as parity and season of calving; aiming at utilizing it as a genetic aid in selection to improve the quality of production of this herd. A 218 bp fragment containing exon 1V of kappa casein gene was amplified by PCR and (SSCP) was applied to identify the structural gene polymorphism of κ-Cn. General linear model (GLM) was used to analyze differences between (κ-Cn) genotypes. The results indicated that κ-Cn genotypes significantly (P<0.05) affected fat, protein and lactose content. But it had not influenced (P>0.05) both TS and SNF. However, cows with genotype TT showed higher fat and protein percent (3.89 and 3.50%, respectively) than those of genotypes CC and TC (3.62 and 3.66% for fat; 3.35 and 3.36 % for protein, respectively). Except for lactose content; parity had no effect on milk components. Also, the results disclosed that season of calving did not affect (P>0.05) milk composition. This study indicated that the κ-CN genetic variants may be used as a genetic aid through increasing the frequency of desired genotypes to improve the quality of production of this herd.

Page(s): 153-156

DOI: DOI not available

Published: Journal: Pakistan Veterinary Journal, Volume: 31, Issue: 2, Year: 2011

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