Anti-O chaining titre in colostral serum from cows infused prepartum withSalmonella Pullorum-H

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Abstract
Summary: A high anti-O chaining titre againstSalmonella pullorum-H can be obtained in colostral serum when the killed antigen is introduced into the mammary gland during the dry period. A significant titre, several times the normal level, is maintained in the milk serum for 3 weeks postpartum. There was a definite residual titre in the milk serum of non-infused cows against the O and H antigens ofSalmonella typhosaand the O antigen ofS. pullorum-H.