Effects of low protein diet supplemented with threonine on growth performance,muscle development and economic benefit of meat ducks
This study was conducted to investigate the effects of low protein diet supplemented with threonine on growth performance,muscle development and economic benefits of meat ducks.1000 one-day-old healthy ducks were divided into 4 groups with 1 group per 10 replicates and 25 ducks per replicate.The control group(group Ⅰ)was fed with a normal protein level diet,and the experimental groups Ⅱ,Ⅲ and Ⅳ were fed with a 2% reduction of crude protein level on the basis of the basic diet while supplemented with Met and Lys to maintain the consistency of Met and Lys levels among the groups.The experimental diets were supplemented with 0%,0.10% and 0.20% threonine,respectively.Compared with the control group,FBW of ducks in 2% crude protein level group was significantly decreased by 5.76% (P＜0.05);Compared with low protein diet group,FBW of ducks in 0.20 Thr group was significantly increased by 2.70% (P＜0.05),but was still lower than that in control group by 3.21% (P＜0.05).In the low protein diet group,ADG was significantly decreased by 5.89%,4.52% and 3.29% (P＜0.05)and F/G was significantly increased by 7.65%,5.09% and 3.91% (P＜0.05),respectively,in the 0% to 0.20% Thr groups.Compared with the control group,the breast muscle percentage of ducks supplemented with 0%～0.20% Thr in low protein diet group was significantly decreased(P＜0.05);The thigh muscle percentage of ducks in low protein diet group supplemented with 0% to 0.20% Thr group was significantly decreased(P＜0.05),and compared with 0% and 0.10% Thr groups,the thigh muscle percentage of ducks in 0.20% Thr group was significantly increased(P＜0.05).The muscle crude protein content of ducks supplemented with 0% to 0.20% Thr in low protein diet group was significantly decreased(P＜0.05),compared with 0% Thr group,The muscle crude protein content of ducks in 0.10 and 0.20% Thr groups was significantly increased(P＜0.05).The feed prices of all groups were 3.2701,3.1783,3.1855 and 3.1927 yuan/kg,respectively.The total feed cost of low protein diet supplemented with 0% to 0.0820% Thr group was significantly lower than that of control group,and there was no significant difference among groups(P＞0.05).After comprehensive calculation,the gross profit of each group in this experiment was 15.33,13.51,14.15 and 14.51 yuan,respectively.The gross profit of low protein diet supplemented with 0% to 0.0820% Thr group was significantly lower than that of control group(P＜0.05).In conclusion,dietary protein level has a significant effect on the growth of meat ducks,and adding 0.10% Thr can partially restore the growth retardation caused by low protein level.
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