The effects of gallnut extract on the growth performance,immune organ index,and serum immune indicators of meat ducks
The aim of this study is to investigate the effects of gallnut extract(GE)on the growth performance,immune organ index,and serum immune indicators of meat ducks.Add 0,100,200,and 400mg/kg GE as the experimental feed.Select 20000 healthy 1-day-old meat ducks and randomly divide them into 4 groups,with 10 replicates in each group and 500 ducks per replicate.Feed each group with experimental feed for 42 days.The experimental results showed that,under the premise of consistent initial weight(P＞0.05),the addition dose of 200 mg/kg GE significantly increased the final weight of meat ducks by 3.56%(P＜0.05),and the feed to weight ratio significantly decreased by 4.51%(P＜0.05);Meanwhile,GE had no significant effect on feed intake and daily weight gain of meat ducks(P＞0.05).The 21 day thymus and bursal index of meat ducks in the 200 and 400 mg/kg GE groups were significantly higher than those in the control group(P＜0.05);The spleen index of meat ducks in the 200 and 400 mg/kg GE groups at 42 days was significantly higher than that of other groups(P＜0.05);In addition,adding 100-400 mg/kg of GE had no significant effect on the 21 day spleen index,42 day thymus index,and Fahrenheit sac index of meat ducks(P＞0.05).The addition of 100-400 mg/kg GE significantly increased the serum IgM and IgA content of 21 day meat ducks(P＜0.05),while the addition of 200-400 mg/kg GE significantly increased the serum IgG content of 21 day meat ducks(P＜0.05);The addition of 200-400 mg/kg GE significantly increased the serum IgM content of 42 day meat ducks(P＜0.05);The addition of 100-400 mg/kg GE significantly increased the serum IgA and complement C3 levels in 42 day meat ducks(P＜0.05).At the same time,GE had no significant effect on the levels of complement C3 and C4 in the serum of 21 day meat ducks,and IgG and complement C4 in the serum of 42 day meat ducks.In summary,the optimal dosage of GE is 200 mg/kg.
meat duckgalla extractgrowth performanceimmune function
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万方数据
