Bovine kappa-casein gene polymorphism and its association with milk production traits

Satyanarayana Rachagani, Ishwar Dayal Gupta

Research output: Contribution to journalArticlepeer-review

34 Scopus citations


Point mutations in exon IV of the bovine κ-casein (CSN3) gene determine two allelic variants, A and B. These variants were distinguished by polymerase chain reaction and restriction fragment length polymorphism (PCR-RFLP) analysis in the indigenous Sahiwal and Tharparkar cattle breeds. DNA samples (252 Sahiwal and 56 Tharparkar) were analyzed for allelic variants of the CSN3 gene. Polymorphism was detected by digestion of PCR-amplified products with HindIII, HhaI and HaeIII restriction enzymes, followed by separation on 3% agarose gels, and resolved by ethidium bromide staining. Allele A of the κ-casein gene occurred at a higher frequency than allele B, in both Sahiwal and Tharparkar breeds. The genotypic frequencies of AA, AB, and BB in the Sahiwal and Tharparkar breeds were 0.758, 0.230 and 0.012, and 0.0.732, 0.250 and 0.018, respectively. The frequencies of alleles A and B in the Sahiwal and Tharparkar breeds were 0.873 and 0.127, and 0.857 and 0.143, respectively. Genotype BB of the kappa-casein gene had more influence on the monthly milk yield, 305-days milk yield, monthly solids-not-fat (SNF) yield, and monthly protein yield, in the Sahiwal cattle.

Original languageEnglish (US)
Pages (from-to)893-897
Number of pages5
JournalGenetics and Molecular Biology
Issue number4
StatePublished - 2008
Externally publishedYes


  • Genetic polymorphism
  • Indian cattle
  • K-casein
  • R-RFLP

ASJC Scopus subject areas

  • Molecular Biology
  • Genetics


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