• 1 January 1973
    • journal article
    • Vol. 24  (1) , 157-62
Abstract
The proportion of IgA, IgG and IgM in sow colostrum and milk that is derived from serum has been determined by measuring the transfer of 125I-labelled immunoglobulin from serum. All colostral IgG and a high proportion of IgM are derived from serum as is 40 per cent of IgA. Thus it would appear that colostrum is not a true secretion since 90 per cent of its immunoglobulin content is of serum origin.