The conditions that favor multiplication of microbe in the rumen 

• Favorable pH (6.2 – 6.8) which maintained by saliva and continuous removal of volatile fatty acid.
• Low level of oxygen since most of these microbes are anaerobic.
• Enough moisture
• Supply of readily fermentable carbohydrates such as sugar and starch
• Adequate supply of energy and nitrogen which enhances microbial activity

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