Effect of non-genetic factors on various economic traits in Karan Fries crossbred cattle

Abstract

Data of 681 cows were collected over a period of 15 years, and analysed to observe the effect of non-genetic factors on different economic traits in Karan Fries crossbred cattle. The overall least squares means of age at first calving (AFC), service period (SP), 305 days or less milk yield (305DMY), total milk yield (TMY), lactation length (LL), preceding dry period (PDP), calving interval (CI), average milk yield per day of lactation length (MY/LL) and average milk yield per day of calving interval (MY/CI) were 1043.40±6.64 days, 133.66 ± 3.89 days, 4113.61±55.90 kg, 4677.84±50.35 kg, 365.10± 3.34 days, 67.93 ± 2.12 days, 439.03±5.39 days, 12.93±0.99 kg and 11.08±0.13 kg respectively. It was observed that the period of birth was significantly different (P˂0.01) on AFC. Similarly season of calving and period of calving was also significantly different (P˂0.05) with SP, 305DMY and MY/CI, while season of calving was significant (P˂0.01) on TMY and MY/LL. Effect period of calving was also significant (P˂0.01) on AFC, 305DMY, TMY, LL, MY/LL and MY/CI. It was also observed that the parity was significant on SP (P˂0.05), while 305DMY, TMY, LL, CI, MY/LL and MY/CI were significant at (P˂0.05).