The effect of administration of daidzein (5. 0ppm) during late pregnancy on the immune function of sows and neonate piglets as well as on the levels of growth hormone (GH), prolactin (PRL)and somatostain (SS)in serum and colostrum of sows were studied. These results showed: 1 ) The concentration of antibody to swine fever virus vaccine and hemolysin in sow serum and colostrum were significantly enhanced, suggesting that both the systemic and mammary gland humoral immune functions in sows was notably enhanc...