Abstract
The present study was conducted to comparatively examine the characteristics of reproduction in sows which had protease antibody produced by Corynebacterium pyogenes and to examine the changes in the titer of the antibody in sera of their piglets.
The protease antibody was checked by the gel precipitation reaction by TAKEUCHI et al6).
No difference was seen in the characteristics of reproduction, litter sizes, number of still-births, or survival rates after birth between the sows which had and those which had not the protease antibodies.
It was therefore realized that unless any special disturbance is manifested even though the sows had the antibodies, there are no difference between the two groups of sows in terms of the functions as the sows for reproduction.
The check of the blood samples collected in time lapse from the piglets farrowed by sows with and those without CP protease antibodies for the transfer of the antibodies revealed that the antibodies were found transferred from the sows with the antibodies into the piglets via milk, but were eliminated from the bodies after weaning.
It was judged that there would be no specific tendency in the susceptibility of the piglets to CP subject to positivity or negativity of the antibodies in sows, because all the piglets remained negative up until 8 months of their age.
