Abstract
A complete secretory immunologic system has been identified in the equine species. It is characterised by the presence of a secretory component either bound to secretory IgA (SIgA) or remaining in the free form (FSC). The mean molecular weights of SIgA, serum IgA and FSC have been estimated. The homology of the equine and human IgA classes have been demonstrated by cross-reaction with anti-human IgA antisera. A quantitative study of equine immunoglobulins in various fluids have shown that SIgA is predominant in saliva, mature milk, nasal and lacrimal secretions, but not in colostrum. <i>In vitro </i>binding of human and bovine FSC is found to occur mostly with the polymeric form of equine serum IgA.
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