Effects of Enteromorpha prolifera Polysaccharide on Growth Performance,Serum Biochemical Indexes,Meat Quality and Muscle Amino Acid Contents of Fattening Tan Sheep
The aim of this experiment was to investigate the effects of Enteromorpha prolifera polysaccharide on growth performance,serum biochemical indexes,meat quality and muscle amino acid contents of fattening Tan sheep.Forty health 45-day-old male Tan lambs with similar body weight[(22.17±0.36)kg]were ran-domly divided into 4 groups with 10 replicates per group and 1 lamb per replicate.The supplemental levels of Enteromorpha prolifera polysaccharide in the diets of the four groups were 0(control group),500(test groupⅠ),1 000(test group Ⅱ)and 1 500 mg/kg(test group Ⅲ),respectively.The pre-experimental period las-ted for 10 days,and the experimental period lasted for 60 days.The results showed as follows:1)the final body weight(FBW)and average daily gain(ADG)of test groups Ⅱ and Ⅲ were significantly higher than those of the control group(P＜0.05),and the feed to gain ration(F/G)was significantly lower than that of the control group(P＜0.05).2)The contents of immunoglobulin A(IgA),immunoglobulin G(IgG),im-munoglobulin M(IgM),total protein(TP)and globulin(GLB)in serum of test group Ⅲ were significantly higher than those of the control group(P＜0.05),and the serum alkaline phosphatase(ALP)activity of test group Ⅲ was significantly lower than that of the control group(P＜0.05).3)The carcass weight of test groupⅢ was significantly higher than that of control group and test group Ⅰ(P＜0.05),and the back fat thickness and cooking loss were significantly lower than those of the control group(P＜0.05).4)The contents of gly-cine(Gly),aspartic acid(Asp),glutamic acid(Glu),leucine(Leu),threonine(Thr)and tyrosine(Tyr)in longissimus dorsi of test group Ⅲ were significantly higher than those of the control group(P＜0.05),and the contents of total amino acids(TAA),essential amino acids(EAA),delicious amino acids(DAA)and sweet amino acids(SAA)in longissimus dorsi of test groups Ⅱ and Ⅲ were significantly higher than those of the control group(P＜0.05).In summary,the addition of Enteromorpha prolifera polysaccharide in the basal diet of fattening Tan sheep can improve the growth performance,serum biochemical indexes and meat quality to varying degrees,among them which adding 1 500 mg/kg Enteromorpha prolifera polysaccharide has the best effect.[Chinese Journal of Animal Nutrition,2023,35(12):7920-7930]
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