Natzke R P, LeClair B J
J Dairy Sci. 1976 Dec;59(12):2152-4. doi: 10.3168/jds.S0022-0302(76)84502-X.
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.
十头荷斯坦奶牛被安置在接种了大肠菌群肉汤培养物的新鲜、未处理的锯末上。在为期4周的实验期内，大肠杆菌浓度维持在每克10⁶菌落形成单位。十头对照奶牛被安置在干刨花上。细菌污染的增加导致乳头末端的污染增加；然而，没有发生新的大肠菌群感染。
