Factors affecting production traits in Rathi cow conserved for semi arid zone of Rajasthan (Nohar).

摘要

Based on 419 lactation records of Rathi (Rath) cows in their first to ninth lactation in the period 1978-92, the effects of agroclimatic conditions and season of calving were assessed. Statistical analysis showed no differences in production traitswith years, seasons or parity except for milk yield per day of lactation length and dry period. The overall milk yield was 1157.03+-36.018 kg, lactation length was 264.68+-4.75 days, the dry period was 185.90+-7.37 days and milk yield per day was 5.87+-0.096kg. Animals that calved in the winter or monsoon periods produced more milk than those that calved in summer; this was attributed to the effects of the high summer temperatures (up to 48degC). Daily milk yield was lowest at first calving, increased up tothe fourth calving and then remained constant.