不同粗蛋白水平代乳粉对济宁青山羊羔羊生长性能、抗氧化指标及养分表观消化率的影响OA

The experiment aimed to investigate the effects of milk replacers with different crude protein(CP)levels on the growth performance,serum biochemical indices,antioxidant indices,and nutrient apparent digestibility in Jining grey goat lambs.A total of 60 healthy seven-day-old Jining grey goat lambs were randomly divided into four groups,with three replicates per group,and five lambs per replicate.Lambs in the control group(group CK)were naturally suckled by their dams and had free access to forage.Lambs in the experimental groups were gradually transitioned to milk replacers with CP levels of 23.24%(group TA),25.12%(group TB),and 27.70%(group TC)starting from seven days of age,were completely weaned at 21 days of age,and the trial lasted until 84 days of age.The results showed that the average daily gain(ADG)of the group CK from 21 to 49 days of age was significantly higher than that of the experimental groups(P<0.05),while the overall ADG of the groups TB and CK was significantly higher than that of the groups TA and TC(P<0.05).At 84 days of age,the body length(BL),body height(BH),and hip width(HW)of the group TB were significantly superior to those of the groups TA and TC(P<0.05).The serum albumin(ALB)content in the group TB was significantly higher than that in the group CK(P<0.05).The serum urea(Urea)content in the group CK was significantly lower than that in the groups TB and TC(P<0.05).The total cholesterol(TC)content in the groups TC and CK was significantly higher than that in the group TA(P<0.05).The serum catalase(CAT)and glutathione peroxidase(GSH-Px)activities in the group TB were higher than those in the other groups,while the malondialdehyde(MDA)content was significantly lower than that in the other groups(P<0.05).The total antioxidant capacity(T-AOC)in the group CK was significantly lower than that in the other groups(P<0.05).The dry matter intake(DMI)in the group TB was significantly higher than that in the other groups(P<0.05).The apparent digestibility of dry matter(DM)in the groups TA and TB was significantly higher than that in the groups TC and CK(P<0.05),and the apparent digestibility of CP in the group TB was significantly higher than that in the group CK(P<0.05).The study shows that the milk replacer with a CP level of 25.12%can significantly improve growth performance,antioxidant capacity,and nutrient apparent digestibility in Jining grey goat lambs,and is the appropriate CP level for the milk replacer of this breed.