Milk protein polymorphism in Jamunapari Goats

Abstract

In this study out of 27 samples were for casein estimation in which four ás1-casein variants namely A, B, E and F were observed. Out of total milk sample analyzed, 14 milk samples showed BE variants, 7 milk samples showed AF variants, 5 milk samples showed AB variant and only 1 milk sample showed AA variant. The predominant allele of ás1-casein in Jamunapari goat was ás1- cnB, with a frequency of 0.37; whereas the frequency of ás1-can, ás1-cnE and ás1-cnF were, 0.24, 0.25 and 0.12, respectively. The observed heterozygosity for ás1-casein in Jamunapari goat was 0.77 whereas the expected heterozygosity was 0.73.Out of 27 milk samples 21 milk samples showed AA variant and only 6 samples showed AB variant in ás2 casein. The predominant allele of ás2 casein locus in Jamunapari goat was A with a frequency of 0.88 whereas the frequency of B was 0.11. For ás2 casein, the values of obs. and exp. heterozygosity were 0.22 and 0.20, respectively. In the present investigation, carried out on 27 milk samples of Jamunapari goats no polymorphism of â-Cn locus was observed. Out of 27 samples all samples contained the â-Cn variant A and expressed in homozygous form in the population. Hence the allelic frequency of A variant for this locus was 1.00.In case of â-Cn the values of obs. and exp. heterozygosity was found 0.In the present study, no polymorphism of -Cn locus was observed. Out of 27 milk samples all samples contained the -Cn variant A and expressed in homozygous form in the population. The allelic frequency of a variant for -Cn locus was 1.00. In case of -Cn the values of obs. and exp. heterozygosity was found 0. In the present studies, the polymorphic pattern was observed in the â- LG locus for Jamunapari goats. Two variants namely, A and B were observed. The allele frequency of â- LG A variant was 0.87 whereas the allele frequency for â- LG B variant was 0.12. Results of the present study suggested that the milk protein variant in Jamunapari goat breed might be selection criteria for selecting high total protein content in milk.