Effects of composite enzyme preparations on growth performance,nutrients apparent digestibility,immune function,and mutton quality of mutton sheep
The purpose of the experiment was to explore the effects of composite enzyme preparation on the growth performance,nutrients apparent digestibility,immune function,and mutton quality of mutton sheep.A total of 120 mutton sheep were divided into four groups by random block design method,with six replicates in each group and five mutton sheep in each replicate:Control group(basal diet),experimental group A(basal diet+1.0 g/kg composite enzyme preparation),experimental group B(basal diet+2.0 g/kg composite enzyme preparation),and experimental group C(basal diet+4.0 g/kg composite enzyme preparation).The pre-test lasted for seven days and the formal test lasted for 90 days.The results showed that the average daily gain of the mutton sheep in the experimental group C was significantly higher than that in other groups(P＜0.05),and the feed to weight ratio was significantly lower than that in other groups(P＜0.05).The apparent digestibility of crude protein,crude fat,dry matter,acid detergent fiber,neutral detergent fiber,and calcium in all the experimental groups were significantly higher than those in control group(P＜0.05).The concentrations of serum immunoglobulin G(IgG),immunoglobulin A(IgA),and spleen index of mutton sheep in the experimental group C were significantly higher than those in other groups(P＜0.05).The carcass weight and pH24h value of mutton sheep in the experimental group C were significantly higher than those of other groups(P＜0.05),while the cooking loss and drip loss were significantly lower than those of other groups(P＜0.05).The shear stress of experimental group B and group C was significantly lower than that of experimental group A and control group(P＜0.05).The study indicates that the composite enzyme preparation can improve the growth performance,apparent digestibility of nutrients,immune function,and mutton quality of mutton sheep,and the application of 4.0 g/kg composite enzyme preparation has the better effect.
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