Causes and Nutritional Control Methods of Subacute Rumen Acidosis in Dairy Cows

  • ZHOU Jun ,
  • ZHANG Sen ,
  • DONG Guozhong
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  • Chongqing Key Laboratory of Forage and Herbivore, College of Animal Science and Technology, Southwest University, Chongqing 400716, China

Received date: 2011-09-15

  Online published: 2012-02-28

Supported by

国家"973计划"项目(2011CB100800)

Abstract

Subacute rumen acidosis (SARA) as a serious problem frequently occurs in the production of dairy cows, and is mainly caused by the diet structure of high proportion of concentrate and low proportion of roughage. The structure results in a change of rumen microbial colonies and an increase in volatile fatty acid (VFA) concentrations but a decrease in rumen fluid pH. When SARA occurs, bacterial endotoxin concentration increases. Endotoxin can be transported into bloodstream, as a result, the acute phase response is activated, and levels of plasma minerals and metabolites change, finally, an adverse effect on performance of dairy cows is caused. In this paper, the generation and transportation of endotoxin as well as the endotoxin-induced acute phase response under a high concentrate diet feeding condition are reviewed, meanwhile, based on studies in recent years, some new methods for reducing yield and transportation of endotoxin are introduced, which may provide references for controlling harmful effects of endotoxin in dairy cows suffered SARA.

Cite this article

ZHOU Jun , ZHANG Sen , DONG Guozhong . Causes and Nutritional Control Methods of Subacute Rumen Acidosis in Dairy Cows[J]. Chinese Journal of Animal Nutrition, 2012 , 24(3) : 439 -446 . DOI: 10.3969/j.issn.1006-267x.2012.03.009

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