b-Lactoglobulin Variants in Awassi and Morkaraman Sheep and their Association with the Composition and Rennet Clotting Time of the Milk

Authors : Şerafettin ÇELİK, Salih ÖZDEMİR

Pages : 539-544

View : 19 | Download : 6

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :In this study, b-lactoglobulin insert ignore into journalissuearticles values(b-Lg); variants in Awassi and Morkaraman sheep were studied using polyacrylamide gel electrophoresis, and their association with composition and rennet clotting time of the milk was estimated. Two alleles insert ignore into journalissuearticles values(A and B); and 3 different genotypes for b-Lg insert ignore into journalissuearticles values(AA, AB and BB); were observed in the whey from both breeds. The frequencies of b-Lg alleles were estimated as A 0.63 and B 0.37 in the Awassi breed, and A 0.56 and B 0.44 in the Morkaraman breed. These results indicate high b-A frequencies in both sheep breeds. Significant relationships were obtained between b-Lg variants and some properties of the milk from both sheep breeds insert ignore into journalissuearticles values(P < 0.01);. In the Awassi breed, milks with b-Lg BB had significantly higher fat content and lower lactose content, while milks with the same variant had higher protein and solid non-fat contents in the Morkaraman breed. On the other hand, milks with the b-Lg AA variant in the Awassi breed had a short rennet clotting time, while milks with this variant in the Morkaraman breed had the lowest value for rennet clotting time but the result was not statistically significant. Therefore, it could be concluded that milks with the BB genotype are of importance in terms of cheese technology.
Keywords : Awassi, Morkaraman, b Lg, milk composition, rennet clotting time