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Ozdemir, M. and Dogru, U. 2005. Relationship between kappa-casein polymorphism and production traits in Brown Swiss and Holstein. J . Appl. Anim. Res., 27: 101-104.To study the effect of kappa-casein polymorphism on milk production traits, milk samples from Brown Swiss, Holstein and East Anatolian Red cows were analyzed for kappa-casein, AA, AB and B B variants using horizontal starch-gel electrophoresis. Differences among breeds studied were not significant on gene variants. Although the effects of kappa-casein phenotypes on fat percentage and 305d fat yield in Brown Swiss and Holstein cows were found to be significant (P-d.01 and P4.05, respectively), there was no effect on milk yield, 305d milk yield, lactation period and milk fat yield. This study provides evidence that production and percentage of fat ratio can be maximized by the use of kappa-casein BB genotype and milk production by the use of kappa-casein AB genotype with selective goal in herds and increase in frequency of kappa-casein B genes in herd could contribute to significantly improve yield traits.

Ozdemir, M and Dogru, U. 2007. Relationships between beta-lactoglobulin and beta-casein polymorphisms and production traits in Brown Swiss and Holstein. J. Appl. Anim. Res.,.To study the effects of Beta-Lactoglobulin (B-Lg) and Beta-Casein (p-Cn)

The aim of this study was to determine the specific polymorphic sites in cattle breeds and inter-and interbreed genetic variation among breeds and to develop a databank of Turkish native cattle mtDNA using sequence analysis. The entire D-loop region was analyzed based on DNA sequences in Turkish Grey, East Anatolian Red, South Anatolian Red, and Anatolian Black native breeds. In total, 68 nucleotide differences were observed at 26 different sites. The variable positions consisted of 22 transitions, two transversions, and two insertions, but no deletions. Haplotype number, haplotype diversity, nucleotide diversity, and mean number of pairwise difference values were found to be 17, 0.993, 0.00478, and 4.275, respectively. In addition, a phylogeny was developed by comparison among cattle populations for which the entire D-loop sequence was available. A high level of genetic variation was observed within and among the native cattle breeds.