Vol. 9, Issue 1 (2020)

Author(s):
S Vani, K Sakunthala Devi, M Kalyan Chakravarthy and V Manasa

Abstract:
Thirty six Ongole and sixteen JerseyxSahiwal crossbred cattle were screened to study the chromosome profile by using peripheral short-term lymphocyte culture technique. The diploid chromosomal number was found to be 60 in both the breeds. All the 29 pairs of autosomes were found to be acrocentric, while X chromosome was sub-metacentric in both the cattle breeds. Y chromosome was found to be acrocentric in Ongole and submetacentric in JxS crossbred cattle. The mean relative length of autosomes ranged from 1.75±0.19 to 5.54±0.19 and 1.83±0.14 to 5.56±0.33 in Ongole and J x S crossbred cattle respectively. The X-chromosome was found to be largest sub metacentric in Ongole (5.42 ±0.31) and JxS crossbred (5.36 ±0.22), while the Y chromosome was the smallest acrocentric in Ongole (1.68 ± 0.05) and submetacentric in JerseyxSahiwal crossbred (2.55 ±0.31). Arm ratio and centromeric index of X chromosome in ongole cattle as well as and X & Y chromosomes in SahiwalxJersey crossbred cattle confirmed their sub metacentric nature.