Lecture17 - Factors Affecting Rumen Microbial Population...

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Factors Affecting Rumen Microbial Population Effects of Antibiotics Antibiotics can have a dramatic effect on the rumen microbial population, but must be constantly present to maintain the effect. Ionophores such as Monensin and Lasalocid are used to alter rumen fermentation and improve the efficiency of feed utilization. These ionophores work by increasing the molar proportion of propionate, decreasing methanogenesis and inhibiting proteolysis and deamination. Ionophores inhibit gram-positive bacteria Ruminococcus and Butyrivibrio . These bacteria are primarily acetate and butyrate producers. Ionophores select for gram-negative bacteria Bacteroides and Selenomonas which produce propionate and succinate (succinate is converted to propionate).
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Factors Affecting Rumen Microbial Population Effects of Antibiotics Ruminococcus Butyrivibro Selenomonas Bacteroides Carbohydrates Acetate Butyrate Succinate Formate Acetate Propionate Acetate Succinate Formate Selected against by monensin and lasalocid Selected for by monensin and lasalocid CH 4
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Factors Affecting Rumen Microbial Population Ionophore - Monensin (Rumensin) Polyether compound produced by Streptomyces cinnamonensis. Monensin is an ionophore antibiotic that functions primarily in the
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This note was uploaded on 09/19/2011 for the course ANS 5446 taught by Professor Brown during the Spring '08 term at University of Florida.

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Lecture17 - Factors Affecting Rumen Microbial Population...

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