Japanese Journal of Veterinary Research;Volume 7, Number 1-4

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BACTERIOLOGICAL STUDIES ON STREPTOCOCCI FROM BOVINE UDDER II. : DISTRIBUTION OF STR. AGALACTIAE IN DOMESTIC ANIMALS AND LONG-TERM OBSERVATIONS ON THE UDDER WHICH HARBOURED THE ORGANISM

SHIMIZU, Kiheiji;NAKAGAWA, Masaro;ONO, Teiji

Permalink : http://hdl.handle.net/2115/4663
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Abstract

Bacteriological studies were carried out on the distribution of Str. agalactiae in organ materials of domestic animals, which were obtained from the Sapporo abattoir, including cows milk from herds near Sapporo. Long-term observations on the cows which harboured Str. agalactiae in their milk samples were also made. The data obtained are summarized as follows : 1) Streptococcal strains to the number of 723 which were obtained from samples from 4 species of domestic animals (horses, sheep, cows and swine) were biochemically examined (table 1). 2) Among 65 strains which showed some biochemical characteristics resembling those of Str. agalactiae or Str. dysgalactiae, 39 strains were serologically diagnosed (table 2). 3) Str. agalactiae was detected from 4 materials other than cow's milk : 1 from horse nasal fluid (1/105…0.95%), 1 from horse tonsils (1/112…0.89%) and 2 from swine tonsils (2/101…1.9%) respectively (table 3). 4) Detection of Str. agalactiae from cow's milk tested near Sapporo was 14.6% in mastitis or abnormal milk (59/404) and 1.6% in normal milk (7/451). The survery was conducted on 217 cows which were fed by 78 owners (table 4). 5) From the above facts, it will be seen that Str. agalactiae has a very intimate affinity for the cow's udder. 6) Str. agalactiae showed the tendency to expel the infections caused by other organisms and gradually to invade from one quarter to another (chart 1). 7) The cows which harbour Str. agalactiae in their milk will usually show mastitis or various degrees of milk abnormalities before long, even if their milk showed normal for the time being (charts 2 and 3). 8) The authors believe that the presence of Str. agalactiae in a cow's milk may result in the development of mastitis sooner or later.

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