Résumé
Complex vertebral malformation [CVM] has considerable economic impact on dairy cattle breeding due to extensive use of artificial insemination [AI]. Identifying the carrier is an important factor to reduce the incidence of the genetic disorder. The study was conducted to identify the carriers of CVM in Frieswal cattle by polymerase chain reaction-primer-introduced restriction analysis [PCR-PIRA] method, which was further confirmed by sequencing. Carrier prevalence of 1% was observed in the Frieswal cattle. The results of the study clearly demonstrated the existence of carriers of CVM among Frieswal bull calves. Due to the widespread use of AI it is recommended to screen young bulls at early stages for this defective allele in order to avoid its rapid spread within the population
Résumé
The aim of the present study was to screen the genotype profile of bovine kappa-casein gene among Frieswal [HF x Sahiwal] crossbred cattle developed in India. A total number of two hundred Frieswal cows were evaluated for Hinfl RFLP based genotyping of kappa-casein gene. We observed that only two genotypes [AA and AB] exist among the studied population with the genotype frequency of 0.58 [n=117] and 0.42 [n=83], respectively. The calculated allele frequency for A and B was 0.79 and 0.21, respectively. Association of genotypes with certain milk production traits revealed that AB had significant [P<0.05] effect on total milk yield, peak yield, yield at 300 days and SNF% as compared to AA