摘要
选取48只3月龄湖羊公羔,随机分为6个处理组、每个处理组8个重复,每个重复1只羊,试验过渡期10d、预试期7d、试验期50d。采用2×3双因素试验,即两个RPF添加浓度(0和2.4%),3个Bet水平(0、4和8g·d-1)。旨在研究添加甜菜碱(betaine,Bet)和过瘤胃脂肪(rumen protected fat,RPF)对育肥湖羊生长性能、血液参数和瘤胃发酵参数的影响。结果表明,1)添加2.4%的RPF能显著降低湖羊日增重、采食量和末体重(P<0.05),显著提高血浆中胆固醇(TCH)和甘油三酯(TG)含量(P<0.05),对血浆中的葡萄糖(Glu)含量无显著影响(P>0.05);日粮添加Bet对育肥湖羊生长性能和血液指标无显著影响(P>0.05)。二者交互对育肥湖羊生长性能和血液指标无显著作用(P>0.05)。2)添加2.4%的RPF能显著降低饲料中中性洗涤纤维(NDF)和酸性洗涤纤维(ADF)消化率(P<0.05),对干物质(DM)、有机物(OM)和粗蛋白(CP)消化率无显著影响(P>0.05),对瘤胃挥发性脂肪酸浓度及比例无显著影响(P>0.05);日粮添加Bet对养分消化率和瘤胃挥发性脂肪酸浓度及比例无显著影响(P>0.05)。二者互作对瘤胃发酵和养分消化率无显著影响(P>0.05)。综上可知,在本研究条件下,甜菜碱对湖羊无调控作用,RPF主要通过降低湖羊采食量及纤维消化率影响生产性能。实际生产中,若以羊肉产量为目标不宜添加2.4%RPF。
This study was conducted to investigate the effects of different levels of betaine and rumen-protected fat on production performance, blood parameters, and rumen fermentation in Hu sheep. We used a 2×3 dual- factor experiment, consisting of three levels of betaine（0,4, and 8 g ·d-1） and two rumen-protected fat con- centrations （0, and 2.4%）. In the experiment,48 3 month-old Hu sheep lambs were randomly arranged into six groups with eight duplicates of one sheep. The experiment included three periods： an acclimation period of 10 days, a pre-trial period of 7 days, and a trial period of 50 days. Dietary 2.4% rumen-protected fat significantly reduced the production performance, final weight, and carcass weight （P〈0.05）, whereas it remarkably im- proved plasma triglycerides and cholesterol content of Hu sheep fat-tail weight （P〈0.05）. Dietary betaine had no effect on blood parameters, production performance, slaughter performance, and blood parameters of Hu sheep （P〉0.05）. Betaine and rumen-protected fat had no interaction effect on production performance or blood parameters of Hu sheep. Dietary 2.4% rumen-protected fat could significantly reduce the digestibility of NDF and ADF （P〈0.05）, with no obvious impact on DM, OM, or CP digestibility, rumen fermentation, or differ- ent types of fatty acids of Hu sheep （P〉0.05）, whereas dietary betaine had no significant effect on nutrient di- gestibility, rumen fermentation, or different types of fatty acids （P〉0.05）. There was no interaction effect on rumen fermentation or nutrient digestibility （P〉0.05）. The results suggest that under the conditions in this study, betaine had no regulatory effect on fattening production of Hu sheep, whereas rumen-protected fat played a role through ingestion, fat metabolism, and decomposition of fibre. Dietary 2.4% rumen-protected fat reduced fattening production of Hu sheep. In actual production, rumen-protected fat is inadvisable as a dietary additive to influence high meat production.
出处
《草业科学》
CAS
CSCD
北大核心
2016年第12期2565-2575,共11页
Pratacultural Science
基金
现代农业产业技术体系建设专项(CARS-39)
兰州大学中央高校基本科研业务费专项资金(lzujbky-2015-43)
关键词
甜菜碱
过瘤胃脂肪
湖羊
betaine
rumen protected fat
Hu sheep
