@article{mbs:/content/journal/micro/10.1099/00221287-11-3-472, author = "Mackay, Elizabeth S. M. and Oxford, A. E.", title = "Some Facultatively Anaerobic Gram-negative Rods from the Rumen of the Calf and the Sheep", journal= "Microbiology", year = "1954", volume = "11", number = "3", pages = "472-476", doi = "https://doi.org/10.1099/00221287-11-3-472", url = "https://www.microbiologyresearch.org/content/journal/micro/10.1099/00221287-11-3-472", publisher = "Microbiology Society", issn = "1465-2080", type = "Journal Article", abstract = "Summary: The coliform population in the rumens of twelve calves of ages 10–105 days was never greater than 106/g., and consisted mostly of Escherichia coli and intermediate types. Only one well-capsulated strain of Aerobacter aerogenes was isolated, whereas such capsulated strains could be isolated with ease from the rumen of a starch-fed sheep. An unidentified small catalase-negative Gram-negative rod, which readily produced ammonia from urea, was isolated from the rumen contents of two of the older calves, at a dilution of 10−4.", }