Effect of season of first calving on productive herd life, longevity and life time calf production in Tharparkar cow

In the Present study, the effect of season of first calving was assessed on productive herd life (number of days in milk from the date of first calving to the date of disposal of cows from herd either due to culling or death), longevity (number of days from the date of birth to date of disposal of cows from herd either due to culling or death) and life time calf production (total calves born, total female calves born and total female calves reaching milking herd per cow). Least squares means and their standard error were estimated for different season of first calving groups for each trait. The overall means for productive herd life (days), longevity (days), total calves born to each cow, total female calves born to each cow, total female calves reaching milking herd from each cow were 1597.30 ± 1056.47 days, 3341.15 ± 1167.79 days, 4.37 ± 2.71, 2.14 ± 1.84 and 0.91 ± 1.08, respectively. The effect of season of first calving was non-significant on all traits i.e. productive herd life, longevity, total calves born to each cow, total female calves born to each cow and total female calves reaching milking herd from each cow.