不同颗粒日粮对滩羊育肥羊生长性能、养分表观消化率及血清生化指标的影响

旨在探究不同颗粒日粮对育肥羊生长性能、养分表观消化率及血清生化指标的影响.选取体重相近、(70±10)日龄的滩羊羯羔羊60只,随机分为4组:对照组(n=15)、试验Ⅰ组(n=15)、试验Ⅱ组(n=15)、试验Ⅲ组(n=15).对照组饲喂自配全混合日粮(40％自配精饲料+60％自配粗饲料),试验Ⅰ组饲喂50％自配全混合日...

Effects of Different Pelleted Diets on Growth Performance,Nutrient Apparent Digestibility and Serum Biochemical Indexes in Fattening Tan Sheep

This study aimed to assess the effects of different pelleted diets on growth performance,nutrient apparent digestibility and serum biochemical indexes in fattening sheep.A total of 60 wether lambs at ages of 70±10 days of Tan sheep with similar weights were selected and randomly divided into control group(n=15),experimental groupⅠ(n=15),experimental groupⅡ(n=15)and experimental groupⅢ(n=15).The control group fed 100%self-prepared total mixed ration(40%self-prepared concentrate+60%self-prepared forage),experimental groupⅠfed 50%self-prepared total mixed ration(20%self-prepared concentrate+30%self-prepared forage)+50%commercially available total mixed pelleted diet for fattening sheep,experimental groupⅡfed 100%commercially available total mixed pelleted diet for fattening sheep,and experimental groupⅢfed 45%pelleted concentrate supplement+55%pelleted forage.The feeding experiment included a 16 days pre-test period and an 87 days formal test period.The experimental fattening sheep in different groups were weighed at the beginning and end of the experiment,and the average daily gains during the feeding experiment were calculated.The feed intakes were observed and recorded,and the average daily feed intakes and feed/gain were calculated.At the end of the feeding experiment,the apparent digestibility of dry matter,organic matter,crude protein and neutral detergent fiber as well as the serum biochemical indexes were determined using routine methods.The indictors associated with growth performance,nutrient apparent digestibility and serum biochemical indexes among different groups were statistically compared.The results showed that the highest average daily gain was observed in experimental groupⅡ,which was significantly(P<0.05)higher than those of experimental groupⅠand experimental groupⅢ,and was extremely significantly(P<0.01)higher than that of control group;the average daily feed intake of experimental groupⅡwas significantly(P<0.05)lower than those of experimental groupⅠand control group;the experimental groupⅡhad the lowest feed/gain,which was decreased by 60.63%,35.69%and 9.41%compared to control group,experimental groupⅠand experimental groupⅢ,respectively.The apparent digestibility of dry matter,organic matter,crude protein and neutral detergent fiber of experimental groupⅡwere higher than those of the other three groups,and significant(P<0.05)difference was observed in apparent digestibility of crude protein.There were no significant(P>0.05)differences in serum biochemical indexes among different groups.In summary,feeding total mixed pelleted diet improves the growth performance and increases the nutrient apparent digestibility of the fattening Tan sheep,and has no obvious affection on their health.