| a study on heifer mastitis in japan and its causative microorganisms. | survey and bacteriological examination were conducted on heifer mastitis in hokkaido, the northern island of japan over a period from 1976 to 1981. the disease occurred in heifers, mostly 13 to 18 months old, less than a half of which was pregnant in late summer or in august and september. infection occurred predominantly in a front quarter than a rear one. some microorganisms were isolated by the co2 gas jet method from all the 74 secretions from the affected quarters of 67 heifers. actinomyces ... | 1983 | 6677834 |