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Effects of different Lys levels on slaughter performance of Linwu ducks at the age from 49 to 70 days

Lin Qian;Dai Qiuzhong;Jiang Guitao;  
In order to study the effect of Lys on slaughter performance of 49 to 70-day-old Linwu duck,240 healthy Linwu duck with nearly same weight were randomly selected and allocated to 5 groups(the level of Lys were 0.65%, 0.75%,0.85%,0.95%,1.05%) with 6 replicates of 8 each replicate.The experiment period was from 49 to 70 days of age. The results showed that:there was no significant difference on slaughter rate,percentage of half-eviscerated yield, percentage of breast muscle,percentage of leg muscle and percentage of lean meat among each group(P 0.05).But the diet of 0.85% Lys level group had a trend of increasing the percentage of half-eviscerated yield,percentage of breast muscle,percentage of leg muscle and percentage of lean meat(P 0.05),Meanwhile,the percentage of eviscerated yield of 0.85% and 0.75% Lys level group was significantly higher than that of 1.05% Lys level group(P 0.05).The diet of 0.85% and 1.05% Lys level groups had the lowest percentage of abdominal fat,which were significantly lower than that of 0.65% Lys level group(P 0.05 or P 0.01).In conclusion,49 to 70-day-old Linwu duck fed the diet of 0.85% Lys level could own the best slaughter performance.
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