Effects of Saccharomyces cerevisiae fermentation products on performance and rumen fermentation and microbiota in dairy cows fed a diet containing low quality forage

Wen Zhu; Zihai Wei; Ningning Xu; Fan Yang; Ilkyu Yoon; Yihua Chung; Jianxin Liu; Jiakun Wang

摘要

Background:A possible option to meet the increased demand of forage for dairy industry is to use the agricultural byproducts,such as corn stover.However,nutritional value of crop residues is low and we have been seeking technologies to improve the value.A feeding trial was performed to evaluate the effects of four levels of Soccharomyces cerevisiae fermentation product (SCFP;Original XP;Diamond V) on lactation performance and rumen fermentation in mid-lactation Holstein dairy cows fed a diet containing low-quality forage.Eighty dairy cows were randomly assigned into one of four treatments:basal diet supplemented with 0,60,120,or 180 g/d of SCFP per head mixed with 180,120,60,or 0 g of corn meal,respectively.The experiment lasted for 10 wks,with the first 2 weeks for adaptation.Results:Dry matter intake was found to be similar (P ＞ 0.05) among the treatments.There was an increasing trend in milk production (linear,P ≤ 0.10) with the increasing level of SCFP supplementation,with no effects on contents of milk components (P ＞ 0.05).Supplementation of SCFP linearly increased (P ＜ 0.05) the N conversion,without affecting rumen pH and ammonia-N (P ＞ 0.05).Increasing level of SCFP linearly increased (P ＜ 0.05) concentrations of ruminal total volatile fatty acids,acetate,propionate,and butyrate,with no difference in molar proportion of individual acids (P ＞ 0.05).The population of fungi and certain cellulolytic bacteria (Ruminococcus albus,R.flavefaciens and Fibrobacter succinogenes)increased linearly (P ＜ 0.05) but those of lactate-utilizing (5elenomonas ruminontium and Megasphaera elsdenii) and lactate-producing bacteria (Streptococcus bovis) decreased linearly (P ≤ 0.01) with increasing level of SCFP.The urinary purine derivatives increased linearly (P ＜ 0.05) in response to SCFP supplementation,indicating that SCFP supplementation may benefit for microbial protein synthesis in the rumen.Conclusions:The SCFP supplementation was effective in maintaining milk persistency of mid-lactation cows receiving diets containing low-quality forage.The beneficial effect of SCFP could be attributed to improved rumen function;1)microbial population shift toward greater rumen fermentation efficiency indicated by higher rumen fungi and cellulolytic bacteria and lower lactate producing bacteria,and 2) rumen microbial fermentation toward greater supply of energy and protein indicated by greater ruminal VFA concentration and increased N conversion.Effects of SCFP were dose-depended and greater effects being observed with higher levels of supplementation and the effect was more noticeable during the high THI environment.

机译：背景：满足乳制品业对草料需求增长的一种可能选择是使用农业副产品，例如玉米秸秆。但是，农作物残留物的营养价值较低，我们一直在寻求提高其价值的技术。旨在评估四种水平的酿酒酵母发酵产物（SCFP; Original XP; Diamond V）对饲喂低质饲草日粮的荷斯坦奶牛泌乳性能和瘤胃发酵的影响。随机选择80头奶牛分为以下4种处理方法之一：分别每人每天补充0,60,120或180 g / d的SCFP和180,120,60或0 g玉米粉的基础饮食。该实验持续10周，前2周结果：各处理之间的干物质摄入量相似（P＞ 0.05）。随着SCFP补充水平的增加，牛奶产量呈线性增长（线性，P≤0.10），但无效果。牛奶成分含量（P＞ 0.05）。SCFP的添加线性增加（P ＜0.05）N的转化，而不影响瘤胃pH和氨氮（P＞ 0.05）。SCFP的增加水平线性增加（P ＜0.05）瘤胃中总挥发性脂肪酸，乙酸，丙酸和丁酸的浓度，各酸的摩尔比没有差异（P＞ 0.05）。真菌和某些纤维素分解细菌（如Ruminococcus albus，R.flavefaciens和Fibrobacter succinogenes）的种群线性增加（P ＜0.05），而利用乳酸的（5瘤鼻线虫和大球藻）和产生乳酸的细菌（牛链球菌）随SCFP水平的增加线性减少（P≤0.01）。尿嘌呤衍生物线性增加（P ＜0.05）响应SCFP补充，表明SCFP补充可能有利于瘤胃中微生物蛋白质的合成。结论：SCFP补充有效地维持了牛奶的持久性f。饲喂低品质饲草的泌乳中期母牛。SCFP的有益作用可归因于瘤胃功能的改善; 1）较高的瘤胃真菌和纤维素分解细菌和较低的产乳酸菌表明微生物群体向更高的瘤胃发酵效率转移， 2）瘤胃微生物发酵朝着更多的能量和蛋白质供应，这表现为瘤胃VFA浓度增加和氮转化率增加.SCFP的效果取决于剂量，在补充水平较高的情况下观察到更大的效果，并且在高水平时效果更明显THI环境。

Effects of Saccharomyces cerevisiae fermentation products on performance and rumen fermentation and microbiota in dairy cows fed a diet containing low quality forage

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