摘要
[目的]本试验旨在研究饲粮中不同比例发酵饲料对育肥湖羊瘤胃发酵特性、营养物质表观消化率、生产性能及肉品质的影响。[方法]选取6月龄左右、体重(30.86±4.50)kg健康湖羊70只,随机均分5组(每组14只),分别在基础日粮中添加0%(对照组)、2%、4%、6%、8%的发酵饲料(有益菌含量≥1×10~8 CFU·g^(-1))。预饲期15 d,正试期45 d。正试期第45天采集瘤胃液用于瘤胃发酵特性测定;正试期43~45 d,采集饲粮和粪样,测定养分表观消化率;根据正试期采食量、初末重测定生长性能指标;试验结束当天每组随机选择3只育肥羊屠宰,用于胴体性状及肉品质测定。[结果]添加6%发酵饲料的湖羊平均日增重(ADG)显著增加(P<0.05),料重比(F/G)、平均日采食量(ADFI)、干物质采食量(DMI)极显著降低(P<0.01);添8%发酵饲料的湖羊屠宰率较对照组有显著提高(P<0.05)。添加2%、4%发酵饲料时,各养分表观消化率显著提高(P<0.05)。添加不同比例发酵饲料对育肥羊瘤胃液氨态氮(NH_(3)-N)、菌体蛋白(BCP)、乙酸、丁酸、乙酸丙酸比和总挥发性脂肪酸(TVFA)含量以及肉品质无显著影响(P>0.05),但在添加量为6%时,pH值显著降低(P<0.05),丙酸含量显著提高(P<0.05)。[结论]在饲粮中添加6%发酵饲料能提高育肥湖羊养分表观消化率及生产性能,对改善瘤胃发酵特性有积极作用。
[Objectives]This experiment was conducted to investigate the effects of different proportions of fermented feed in diets on rumen fermentation characteristics,nutrient apparent digestibility,performance and meat quality of fattening Hu sheep.[Methods]A total of 70 healthy Hu-sheep about 6 months old with similar body weight(30.86±4.50)kg were randomly divided into 5 groups(n=14).The basal diet in each group was supplemented with 0%(control group),2%,4%,6% and 8% fermented feed(beneficial bacteria content ≥1×10~8 CFU·g~(-1)),respectively.Rumen fluid was collected at 45 d.During the trial period from 43 days to 45 days,dietary and fecal samples were collected to determine nutrient apparent digestibility.The growth performance indexes were measured according to the feed intake and initial and final weight during the test period.At the end of the experiment,3 fattening sheep were randomly selected from each group to be slaughtered for the determination of carcass traits and meat quality.[Results]The average daily gain(ADG)of 6% fermented feed supplemental level significantly increased(P<0.05),the ratio of feed to gain(F/G),average daily feed intake(ADFI)and dry matter intake(DMI)significantly decreased(P<0.01).When the fermented feed supplemental level was 8%,the slaughter percentage significantly increased compared with the control group(P<0.05).The nutrient apparent digestibility indexes significantly increased when 2% and 4% fermented feed were added(P<0.05).Different proportions of fermented feed had no significant effects on the contents of ammonia nitrogen(NH_3-N),bacterial protein(BCP),acetic acid,butyric acid,ratio of ethylene to propylene total volatile fatty acid(TVFA)and meat quality of fattening sheep(P>0.05),but at 6% fermented feed supplemental level,pH value significantly decreased(P<0.05),and propionic acid significantly increased(P<0.05).[Conclusions]The supplementation of 6% fermented feed can improve nutrient apparent digestibility and performance of fattening Hu sheep,and has a positive effect on improving rumen fermentation characteristics.
作者
金宏
柏杨
邓孟云
张敏
马婷
华金玲
JIN Hong;BAI Yang;DENG Mengyun;ZHANG Min;MA Ting;HUA Jinling(School of Animal Science,Anhui Science and Technology University,Fengyang 233100,China)
出处
《南京农业大学学报》
CAS
CSCD
北大核心
2024年第1期151-156,共6页
Journal of Nanjing Agricultural University
基金
安徽省科技重大专项项目(1703001060)
研究生科学研究项目(YK202116)
安徽省大学生创新创业训练计划项目(S202110879174)。
关键词
发酵饲料
育肥羊
生长性能
养分表观消化率
瘤胃发酵特性
肉品质
fermented feed
fattening sheep
production performance
nutrient apparent digestibility
rumen fermentation characteristics
meat quality
