鸭绒羽生长发育的研究

本试验采用天建鸭、建昌鸭、四川麻鸭和天府肉鸭每个品种（系）42只，公母各半]为材料．0-8周龄放牧补饲，9周龄开始舍饲．从7周龄开始采集各部位绒样，12周龄试验结束。本文分析了鸭品种（系）间、公母间、五个部位（胸部、腹部、背部、腿部）间产线性能的差异性；比较了四个品种（系）内性别之间和部位之间城羽生长发育的差异；也分析了四个品种（系）绒羽7-12周龄的生长发育随日龄增加的变化趋势．结果表明：①水禽绒羽的生长发育存在品种（系）间的差异；②鸭绒羽千朵重受体重的影响较大；③鸭绒羽在12周龄时已基本成熟，可以在此时实施第一次人工技羽；④公鸭与母鸭绒羽的性别差异不明显。本文还对衡量绒朵大小的方法进行探讨，提出绒羽长成后用绒羽的丝数、绒朵长和千朵重来衡量绒朵的大小．

STUDY ON THE GROWTH OF DOWN IN DUCKS

42 heads (half male and half female) form fout breeds or strains ofducks were used to study the growth of their downs in five parts incluclingbreast, abdomen, back, neck and legs. The results show as follows: ① There weredifferences in the groth of down of ducks among breede or strains; ②There weresiglificently positive relationslips between the weiglt of 1000 downs and bodyweight; ③The growth of down in ducks stopped after the age of twelve weeks sothe plumage could be plucked; ④The five parts of body (except the legs) wereimportant for producing downs; ⑤The difference of the growth of down betweenthe male and the female ducks was small.