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

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...

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Published in:	Journal of animal science and biotechnology 2017-04, Vol.8 (3), p.677-685, Article 36
Main Authors:	Zhu, Wen, Wei, Zihai, Xu, Ningning, Yang, Fan, Yoon, Ilkyu, Chung, Yihua, Liu, Jianxin, Wang, Jiakun
Format:	Article
Language:	eng
Subjects:	Acetic acid Ammonia Animal lactation Bacteria Carbohydrates Cattle Cellulolytic bacteria Conversion Corn Corn stover Cow's milk Crop residues Dairy industry Diamonds Diet Dietary fiber Dietary supplements Dry matter Experiments Fatty acids Feeding Feeds Fermentation Forages Fungi Gene expression Humidity Lactating cow Lactation Lactic acid Megasphaera elsdenii Microorganisms Milk Milk production Nutrient deficiency pH effects Propionic acid Protein biosynthesis Protein synthesis Quality Rumen Rumen fermentation Rumen microbiota Saccharomyces cerevisiae Saccharomyces cerevisiae fermentation product Supplementation Volatile fatty acids 低品质发酵产物奶牛饲喂微生物区系微生物蛋白质瘤胃发酵酿酒酵母饲草饲料
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Summary:	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 Saccharomyces 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 cel ulolytic bacteria（Ruminococcus albus, R. flavefaciens and Fibrobacter succinogenes）increased linearly（P 〈 0.05） but those of lactate-utilizing（Selenomonas ruminantium and Megasphaera elsdeni） 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 cel ulolytic 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 o
ISSN:	1674-9782 2049-1891 2049-1891