Interrelationships between different chemical components in mixed rumen bacteria

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Abstract
Mixed rumen bacteria entering the duodenum of a ruminant are a major source of some of the nutrients required by the animal. A number of values for the chemical composition of mixed rumen bacteria have been reported and a few observations made on interrelationships between different components at different times after feeding (Hoogenraad & Hird, 1970; Jouany & Thivend, 1972; Bird, 1973; Smith & McAllan, 1973; Czerkawski, 1975; McAllan & Smith, 1974, 1976). There is also some published information on in vivo variations in the storage carbohydrate in mixed rumen bacteria with different diets (Jouany & Thivend, 1972; McAllan & Smith, 1976) but no information on interrelationships between such variations and changes in other components in the bacteria.The present paper reports a study of such interrelationships in bacterial samples, containing wide ranges of storage polysaccharide (α-dextran) and crude protein concentrations, obtained from steers given a wide variety of diets.

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