Effects of Dietary Dihydromyricetin Supplementation on Growth Performance,Nutritional Metabolism and Rumen Microbial Protein Synthesis of Hu Lamb
This experiment aimed to investigate the effects of dietary dihydromyricetin(DMY)supplementa-tion on growth performance,nutritional metabolism,and rumen microbial protein synthesis of Hu lamb.A total of 48 four-month-old purebred Hu lambs,exhibiting good physical condition and similar weight,were chosen for the feeding trial.All experimental sheep were divided into four groups.The diets were supplemented with 0(control group),400(400DMY group),800(800DMY group)and 1 200 mg/kg DMY(1200DMY group),with 12 animals in each group.The feeding experiment lasted 90 days,with a 15-day pre-trial period and a 75-day trial period.Digestive metabolism testing occurred over 10 days,with a 5-day pre-trial period and a 5-day trial period.The results showed as follows:1)compared with the control group,the 800DMY group exhibited a significant increase in final body weight and average daily gain(P＜0.05),accompanied by a nota-ble reduction in the feed-to-gain ratio(P＜0.05).2)The apparent digestibility of dry matter(DM)in the 800DMY group was markedly enhanced compared with the control group(P＜0.05).Furthermore,the appar-ent digestibility of organic matter(OM)in all three groups surpassed that in the control group(P＜0.05).The apparent digestibility of neutral detergent fiber(NDF)in the 800DMY and 1200DMY groups was notably higher than that in the control and 400DMY groups(P＜0.05).A markedly improve in the apparent digestibili-ty of acid detergent fiber(ADF)was observed in the 800 DMY and 1200DMY groups compared with the con-trol group(P＜0.05).3)The fecal energy in the three groups experienced a significant decrease compared with the control group(P＜0.05).Consequently,the total apparent digestibility of the 400DMY,800DMY,and 1200 DMY groups was significantly superior to that of the control group(P＜0.05).4)The 800DMY group exhibited the lowest urinary nitrogen among the experimental groups,demonstrating a significant difference compared with the control group(P＜0.05).As a consequence,the 800DMY group demonstrated the highest nitrogen deposition and nitrogen deposition rate among control,400DMY and 1200DMY groups(P＜0.05).Microbial protein synthesis in 800DMY group was significantly increased compared with control group(P＜0.05).According to the above results,adding appropriate dose of DMY to the fattening diet of Hu lambs can improve the average daily gain and reduce the ratio of feed to gain,and improve the utilization rate of coarse feed,energy utilization efficiency and nitrogen deposition efficiency of the body,which has positive signifi-cance for the fattening of Hu sheep.Under the conditions of this experiment,the optimal supplemental level of DMY in the diet is 800 mg/kg.[Chinese Journal of Animal Nutrition,2024,36(7):4521-4530]
dihydromyricetinHu sheepgrowth performanceapparent digestibilitynitrogen depositionmicrobial protein
万方数据
维普
