关键词: 鸭[49ME], 三元杂交, 饲养方式, 繁殖[49MB], 产肉量

Abstract: In this paper the model of three-way crossing, i.e., M♂×J♀→MJ♀×G♂→GMJ, was studied to improve the reproductive performance, growth rate and meat yield of a white plumage line of Jianchang Ducks(J). The carcass analysis was carried out for ducks at age of 7-8 weeds. The results showed as follows:The egg yield achieved 203.7 eggs for MJ in 40 weeks, 56.6 eggs higher than that ofJ(147.2 eggs). No significant laying season was observed in MJ in part I. In housing, the mean liveweight of GMJ in the 7th week was 2726.5g. The percentage of eviscerated weight and breast muscle yield were increased by 47.9 and 89.3 respectively, compared with those of J. On creep-feeding pasturing, the mean live-weight of GMJ in 7-8 weeks of agewas 2346.9-2614.0g. 39.0 or 32.6 percent higher than those of J. The percentage of eviscerated weight, breast muscle yield and leg muscle yield for GMJ were 34.5.63.9 and 23.0 respectively higher than those of J. In was concluded as follows:The egg yield and egg weight of J could be increased significantly crossed with big meat-type dam line. The rate of growth and meat productivity(especially for breast muscle) could be marketly improved by the three-way cross.

Key words: DUCKS, THREE-WAY CROSSING, REARING SYSTEM, REPRODUCTIVE ABILITY, MEAT YIELD