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The swne IgG was isolati from whole swine semm by Salt Pxthnon (50% (NH4)2 504), DEAE-chromatogaphy, gel filtraton and DEAE-cellulose chromatography rerformftl on salt. Bovine JgG2 was p.irified by salt piaapiton (NH4)2S04), DEA&cdlulcGe chromatography and Fractogel TSR HWSS gel filtaon.
Chicken 1t3 was punfrd form chicken whole serum with salt thpiton(3O% (NH4)2504), DEAE-celluic6e and sephxryl 5-303.
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