Study On Continuous Progeny Selection And Relationships Between Blood Biochemical Indices And Egg-laying Performances In Muscovy Ducks

The study was conducted in attempt to further improve productivity in white muscovy duck. Based on the former selection , the method of family selection combined with individual selection and synthetic index selection was applied to R and F strains of parental generation for continuous progeny selection.The results showed that using synthetic index selection had a fairly good effect on family selection in white muscovy ducks: ①As for the selected paternal line,egg production at the age of 43 weeks and 56 weeks was 0.47 and 2.68 eggs more in number, and 3.9land 1.59 grams higher in egg weight ,and the fertility,hatchability and body weight at the age of hatching were 3.05%, 3.9% and 1.1 grams higher, respectively, than the former paternal line; ②As for the selected maternal line,the age of first laying was 2.42 days earlier, egg production at the age of 43 weeks and 56 weeks 3.1 and 7.03 eggs more in number, egg weight at the of 43 weeks and 56 weeks 0.67g and 0.34g heavier, the fertility and hatchability 0.04% and 0.13% higher ,respectively,than the former maternal line; ③In the first generation ,the paternal line had a faster growth rate than the maternal line:the average body weight and daily gain of the paternal line in different growing periods were heavier than those of the maternal line. For the paternal line , the average body weight and daily gain at the age of 10 weeks were 230.5 and 7.64 grams heavier, respectively, and the feed conversion rate was 0.1 less than that in the maternal Iine,but differences of the livability rate and the length of shank were negligible with two line.In order to provide a scientific basis for early selection ,egg-laying performances of muscovy ducks were recorded individually by "bdominal palpation method" nine blood biochemical indices of 56-week old female ducks were measured, and the relationship between blood biochemical indices andegg-laying performances were investigated. The result showed ?No significant correlation between serum GOT,AKP,LDH,TG,CHOL or LDL-C and egg-laying performances were found (r0.008桹.21) . 〨PT had a significant negative correlation with the age of first laying(ABF)(PO.05), and a significant postive correlation with the egg production at the age of 43 weeks(EN-43) ,50 weeks(EN-50) or 56 weeks(EN-56) (P