摘要
白羽家鸭Ｄ、ＣＤ和Ｂ的公鸭与白羽正番鸭母鸭杂交获得三组反交半番鸭。以正交组为对照。三组鸭１～３级白羽率分别相近；半净膛率低、瘦肉率高和皮脂率低，差异均不显著；胸肌率高，８和１０周龄体重小，两者差异均极显著；反交半番鸭生长速度慢，在８～１０周龄日增重迅速下降，胸肌充分发育均表现其早熟性。反交半番鸭公、母性征明显，体重悬殊，１０周龄时母鸭的体重大约为公鸭的５９％，反交半番鸭孵化期延长至３１～３２ｄ，表现其倾向于母本正番鸭的遗传特性。反交半番鸭具有产蛋能力，母鸭２８周龄开产生蛋，３２周龄达产蛋高峰，产蛋率为７４％，４２周龄时共产蛋５４．４枚，产蛋期间蛋重变化不大，均在５０ｇ左右。
White feather male domestic ducks D,CD and B hybridized with femal white feather muscovy duck M , and three groups of mule ducks DM, CDM and BM were obtained. Compare the ducks with control groups MD,MCD and MB:The ratio of 1～3 classes of white feather were same respectively.The differences of eviscerated weight with giblet, lean and skin fat rate were not significant;the body weights 8 and 10 week age were lighter, the percentage of breast muscle yield was high, the differences of both were significant. The mule duck 's growth speed was rather slow and the daily gain would decline quickly at 8-10 weed age, the breast growth shows early maturity .The differences of the body weight between the male and female of the mule duck was disparate, the female's bedy weight at 10 week age was about 59% of the male's and the incubation period of the mule duck is 31-32 days,it shows dam's(female muscovy) genetic Character. The mule ducks have laying ability.The first egg of the mule duck is at 28 week age. The laying peak is at 32 week age and the laying rate is 74%.The egg number in 42 week age averages 54.4,and the averaged egg weight was 50 grams without great change in the all laying period.
