発酵中初乳内の接種サルモネラの消長

Abstract

When bovine colostrum was inoculated with 103 and 106/ml organisms of Salmonella typhimurium and S. dublin, there was no difference in the maximum bacterial count or survival period between the two species. When 7 colostral samples were inoculated with 102, 103, and 106/ml bacteria, one sample failed to show bacterial growth. In the other 6 samples the bacterial count reached 107-109/ml at 24-48 hours of incubation. It maintained this level for 1-5 days and then decreased. There was a variation of pH value of fermenting colostrum from 3.83 to 4.83 at which salmonellae perished. The survival period ranged from 3 to 20 days. There was no difference in it between the two species. In the colostrum in which fermentation was completed, salmonellae perished within 2 hours after inoculation.