Effect of various genetic and non-genetic factors on production traits of Sirohi goats and its crosses (Half-bred) with Beetal were studied. The data were obtained from All India Coordinated Research Project on Goats located at Central Sheep and Wool Research Institute, Avikanagar, Rajasthan. The data covered a period of 8 years from 1978 to 1985 and pertained to 1284 records of production traits. The Least Squares analysis of variance couldn't detect breed/grade differences for any of the production traits. Seasonal differences were significant for all production traits except lactation length. The periodic differences were highly significant for all the four production traits. Period one had significantly higher lactation yield, peak yield (PY) and milk yield/day of lactation (MYDL) and longer lactation length than period second. MYDL was also significantly influenced by type of kidding. Parity differences were significant for all the traits except MYDL. A gradual increasing trend up to third parity for lactation yield, lactation length and peak yield was evident and thereafter a sharp decline in performance in fourth parity was observed. All possible two-way interactions were also studied.
Beetal, Goat, Lactation yield, Peak yield, Semiarid, Sirohi
