Effects of Eucommia ulmoides leaf extract on nutritional digestibility,growth performance,antioxidant capacity,and immunity of female minks in growing stage
The experiment aimed to explore the effects of different levels of Eucommia ulmoides leaf extract on the nutrients apparent digestibility,growth performance,antioxidant capacity,and immune function in female minks during the growing period.Forty female short-haired black minks with similar body weights and good health at the age of 60±5 days were selected and randomly divided into four groups,with 10 replicates per group and one mink per replicate.Groups Ⅰ(control group),Ⅱ,Ⅲ,and Ⅳ were fed a basal diet supplemented with 0,3,5,and 7 g/(each·day)of Eucommia ulmoides leaf extract,respectively.The preliminary trial lasted for five days,and the formal trial lasted for 30 days.The results showed that there were no significant differences in growth performance indicators among all groups(P>0.05).The apparent digestibility of crude protein and crude fat in groups Ⅲ and Ⅳ was extremely lower than that of the control group(P<0.01).The activities of glutathione peroxidase(GSH-Px)and superoxide dismutase(SOD)in all experimental groups were significantly higher than those in the control group(P<0.05),and the serum malondialdehyde(MDA)content in groups Ⅱ and Ⅳ was significantly lower than that in the control group(P<0.05).There were no significant differences in the content of serum immunoglobulin G(IgG),immunoglobulin A(IgA),and immunoglobulin M(IgM)among the groups(P>0.05).The study indicated that the addition of an appropriate amount of Eucommia ulmoides leaf extract to the diet can improve the antioxidant capacity of minks.Considering practical production,the suitable addition level of Eucommia ulmoides leaf extract in the feed for female minks during the growing period is 3 g/(each·day).
minksEucommia ulmoides leaf extractantioxidant capacitygrowth performanceapparent digestibility of nutrients
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