Abstract
SUMMARY Milk samples, skin swabs and teat canal swabs from a herd of 24 cows were examined bacteriologically twice weekly throughout a lactation. The types of organism found, which were mainly non-pathogens, and their relative proportions in the three sites were determined. Non-haemolytic staphylococci were most common on teat skin, less so in teat canals and least of all in milk. C. bovis was found in large numbers in milk only, and required Tween 80 for growth on blood agar without milk. It showed a steady decline in numbers throughout the lactation. Marked differences in colony count between quarters of the same cow for each site/organism were common, and were due to a steady tendency throughout the lactation. Some cows showed much greater variation of this sort than others. Sir. uberis was isolated much more frequently from milk and teat skin than teat canals.
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