The objective of this study was to reduce the age at first calving of Bos indicus by crossing with Bos taurus in Pakistani
administrative areas of Kashmir. A total of 48 indigenous cows, 32 Indigenous x Jersey (F1), 19 Indigenous x Jersey (F2) and
18 Indigenous x Jersey × Friesian cows were used to compare their age at first calving. The lowest mean age at first calving
was observed in F1 and F2 hybrid cows where it was 951.2±37.35 and 1086 ±37.89 days respectively, followed by F1 × Friesian
(1086 ±37.89) while the highest mean age at first calving was observed in nondescript indigenous (Bos taurus) cows (1861 ±
42.45 days). Analysis of variance showed that the mean age at first calving decreased highly significantly in F1 (P < 0.05); F2
(P < 0.05) and F1 × Friesian (P < 0.05) cows compared to that of nondescript indigenous cows. Mean age at first calving of F1
hybrid cows did not differ significantly (P > 0.05) compared to F2 and F1 × Friesian cows. Similarly, the mean AFC of F2 and
F1 × Friesian did not differ significantly (P > 0.05) from each other. No sire effect was found on age at first calving within F2
and cross bred (P > 0.05). In future crossing of Bos indicus with Bos taurus should be continue for the up gradation of
indigenous cows and maximum of 50% exotic genes should allow to be incorporated in the female stock.
Muhammad Ijaz Khan, Samina Jalali, Beenish Shahid, Sajjad Aslam Shami. (2018) EFFECT OF BREEDING Bos indicus WITH Bos taurus ON AGE AT FIRST CALVING IN PAKISTANI ADMINISTRATIVE KASHMIR, , Volume 55, Issue 2.
