Microbiome-Metabolomics analysis reveals effects of different levels of concentrate in the diets on ruminal microbial and metabolic profiles in Holstein heifers
Introduction The costs associated with replacement dairy heifers were the second to the feed costs of lactating cows on a dairy farm, representing 15 to 20% of total milk production costs (Heinrichs, 1993).Among the total expenses associated with dairy heifer rearing, feed costs were the greatest proportion and took up to 60% of the total cost (Gabler et al., 2000).Recent researches demonstrated that feed and forage intake was reduced and fecal or total manure output could be substantially reduced when dairy heifers were grown under a limit feeding protocol with enhanced dietary energy density (Moody et al., 2000;Hill et al., 2007;Zanton et al., 2009).For limited feeding to be a management practice that could be extensively applied on dairy farms,the physiological and metabolic mechanisms involved need to be better known.Therefore, the objective of this study was to evaluate the effects of limit-feeding diets with increasing levels of concentrate on ruminal profiles of microbiota (bacteria, protozoa, and anaerobic fungi) and metabolites in Holstein heifers.
J.Zhang H.T.Shi Z.J.Cao S.L.Li Y.J.Wang
State Key Laboratory of Animal Nutrition, Beijing Engineering Technology Research Center of Raw Milk Quality and Safety Control, College of Animal Science and Technology, China Agricultural University,Beijing, China, 100193
国际会议
The 5h International Symposium on Dairy Cow Nutrition and Milk Quality(第五届“奶牛营养与牛奶质量国际研讨会)
北京
英文
268-269
2017-05-05(万方平台首次上网日期,不代表论文的发表时间)