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Ten Holstein cows were bedded on fresh, uncured sawdust seeded with coliform broth culture. Escherichia coli concentrations were maintained at 10(6) colony-forming units/g for the 4-wk experimental period. Ten control cows were bedded with dry shavings. The elevated bacterial contamination caused an increase in contamination of teat ends; however, no new coliform infections occurred.
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Natzke et al. (1976) studied this question.
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