A survey of the incidence of leptospira antibody in Holstein cattle and calves
1992
Akuzawa, M. (Kagoshima Univ. (Japan). Faculty of Agriculture) | Okamoto, T. | Matsuo, N. | Yamauchi, S. | Morizono, M. | Yanagita, K.
The Holstein cows and their calves in the Iriki Livestock Farm of Kagoshima University were examined for an estimation of the serum agglutination antibody to leptospires. 96.0 % of the cows were antibody positive in which L. autumnalis were detected with the highest incidence (84.0 %) and were followed L. canicola (48.0 %), L. pyrogenes (36.0 %), L. icterohaemorrhagiae (32.0 %), L. australis (16.0 %), and L. hebdomadis (12.0 %) in order. Antibody titers were within the range from x12 to x2592, with x12 and x72 cases being most in number. Concerning the incidence of serogroups, single and 2 serovars (both being 28.0 %) were noted slightly higher than 4 (24.0 %) and 3 (16.0 %) serovars. The incidence of antibody to L. autumnalis was consistently high in the cases of both single or mixed infection. In all of the calves antibody was detected in which there were 6 serogroups like as their dams, but in most dams and calves serovars were ascertained to be different. Antibody to L. autumnalis, which showed the highest incidence in the calves, tended to increase with age both in the incidence and the antibody titer and became as high as or more than those in dams by 210 days (7 months). From the dam's urine and the wasted water in the pen spiral leptospire-like organisms were cultured which were agglutinated by the serum containing the antibody to leptospires. Antibody to leptospire was also detected in young Golden hamsters inoculated with the leptospire. No abnormal value was obtained in the blood both of the dams and the calves. No leptospire-like organism was found in the blood urine, liver and kidney of the field-mice caught in the farm-pasture, and no antibody was detected in their sera, either
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