PDF(Pubmed)
Abstract：
Betaine improves growth performance and health in monogastric animals under both thermoneutral and heat stress conditions, but results in ruminants have been more equivocal. This meta-analysis investigated the effects of betaine supplementation on productive performance, milk production and composition, and carcass traits of ruminants due to betaine supplementation. A comprehensive search for published studies investigating the effect of betaine was performed using Google Scholar, ScienceDirect, PubMed, and Scopus databases. Effect size analysis, random effects models, I2 statistics, and meta-regression analysis were utilized to assess differences in production parameters. Dietary betaine supplementation increased milk yield (+1.0 kg/d (weighted mean differences presented in this abstract), p < 0.001), dry matter intake (+0.15 kg/d, p < 0.001), and milk lactose (+0.05%, p = 0.010) in dairy cows housed under thermoneutral conditions. In the few studies conducted on small ruminants, there was an increase in milk yield in response to dietary betaine (0.45 kg/d, p = 0.040). Under heat stress conditions or grazing pasture during summer, dietary betaine increased milk yield (+1.0 kg/d, p < 0.001) and dry matter intake (+0.21 kg/d, p = 0.020). Dietary betaine increased final liveweight (+2.33 kg, p = 0.050) and back fat thickness (+0.74 cm, p < 0.001) in beef cattle. Dietary betaine increased final liveweight (0.14 kg, p = 0.010), daily gain (+0.019 kg/d, p < 0.001), and carcass weight (+0.80 kg, p < 0.001) but not backfat in small ruminants. These meta-analyses showed that dietary betaine increases liveweight in small ruminants and beef cattle and increases feed intake and milk yield in dairy cattle.
摘要：
甜菜碱在热中性和热应激条件下改善单胃动物的生长性能和健康，但是反刍动物的结果更加模棱两可。这项荟萃分析调查了甜菜碱补充对生产性能的影响，牛奶生产和成分，和补充甜菜碱引起的反刍动物的car体性状。使用GoogleScholar对已发表的研究甜菜碱的影响进行了全面搜索，ScienceDirect,PubMed,和Scopus数据库。效应大小分析，随机效应模型，I2统计，和荟萃回归分析用于评估生产参数的差异。日粮补充甜菜碱可增加产奶量（+1.0kg/d（本摘要中显示的加权平均值差异），p<0.001)，干物质摄入量(+0.15kg/d，p<0.001)，和牛奶乳糖(+0.05%，p=0.010）在热中性条件下饲养的奶牛中。在对小反刍动物进行的几项研究中，对饮食甜菜碱的反应有牛奶产量的增加(0.45千克/天，p=0.040)。在夏季的热应激条件或放牧牧场下，日粮甜菜碱增加产奶量(+1.0kg/d，p<0.001)和干物质摄入量(+0.21kg/d，p=0.020)。膳食甜菜碱增加最终体重(+2.33千克，p=0.050）和背部脂肪厚度（+0.74厘米，p<0.001)在肉牛中。饮食甜菜碱增加了最终的体重(0.14千克，p=0.010),日增重(+0.019kg/d，p<0.001)，和屠体重量(+0.80公斤，p<0.001），但在小反刍动物中没有回脂。这些荟萃分析表明，日粮甜菜碱可增加小反刍动物和肉牛的体重，并增加奶牛的采食量和产奶量。
