Nutritional Requirements of Lactobacillus bifidus Isolated from Poults and Chicks.

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Abstract
L. bifidus was isolated from the ceca of chicks and turkey poults. All strains are inhibited by high concns. of Na acetate. The organisms can grow aerobically provided ascorbic acid is present, without any apparent change in bifid morphology. No growth occurs in a chemically defined medium, but luxuriant growth occurs in the basal medium when it is supplemented with Phytone or other crude substances. The activity of Phytone cannot be replaced by galactose acetyl-glucosamine nor by several other known growth-promoting substances. The nutritional fastidiousness of L. bifidus isolated from chicks and poults may suggest that these organisms compete with the host for mutually essential nutrients.