Factors Affecting Lactation Milk Yield in Gir Cattle

摘要

The production records on 345 Gir cows with 680 complete lactations sired by 52 bulls, for 24 years (1987-2010) were studied. The data were analyzed to study the effect of period and season of calving and parity as fixed effect on lactation milk yield(LMY). The least-squares mean of LMY was 2276.60±171.32 kg. Highly significant effect of period of calving and parity on LMY was observed. There were highest LMY during fifth parity (2694.20±184.94 kg.) and significant drop after eighth parity. Seasonof calving did not affect significantly LMY, which is one of the best attributes of Gir cattle.