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A study was made o the bacteria and protozoa present in the rumen of three calves from 1 to 13 wk. of age, raised under normal conditions. Ciliate protozoa were not established in these calves. A study of older calves in contact with mature animals after 13 wk. of age indicated that entodinia were first established, followed by diplodinia and holotrichs.
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Bryant et al. (1958) studied this question.
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