关键词: 元素组成, 元素组成

Abstract: To make the restricted feeding method for the meat-type Breeder ducks, a total of 800 cherry valley female breeder ducks at 10 week-old were randomly divided into four groups (T1-T4) with each group included 200 individuals, then these ducks were fed restrictedly to 20 week-old by four different ways. The effect of growing performance, egg-laying performance and hatching level were detected by four different restricted ways. The ideal restricted way was screened by comprehensive comparison. The results showed the average weight at 20 weeks age of T3, T4 was better, and the whole period growth curve of T3, T4 was close to cherry valley duck standard weight curve, and the growth curve of T2 was serious deviation from cherry valley duck standard weight curve. T3, T4 group had earlier first laying, and had highest average egg production at 50 week age, which were 140.2 and 140.6 respectively. The egg production between T3 and T4 was no significant difference (P>0.05), and other groups were significant difference (P<0.01). Laying peak period of T3, T4 had more longer duration than the other two groups. Feeding eggs pass rate, fertility rate, hatching rate were no significant among four groups. According to calculating the economic benefits, T4 group had lowest feed costs. The most ideal feed restricted way was T4 group for cherry valley duck.