SECONDARY ANTIBODY-RESPONSE TO HAEMOPHILUS-SOMNUS ANTIGEN IN BREEDINGJAPANESE BLACK CATTLE FED SELENIUM-DEFICIENT AND ALPHA-TOCOPHEROL-FORTIFIED DIETS

The cattle with adequate alpha-tocopherol (Vit E) and marginally defic ient selenium (Se) status manifested significantly lower anti-Haemophi lus somnus antibody titer than the cattle supplemented with Se in the later stage of an 8-week trial. However, in the early stage no differe nce was observed in magnitude of anti-H. somnus antibody development b etween them. These results suggested that Se may contribute to anti-H. somnus antibody production, and that Vit E can make up for Se deficie ncy to a certain degree.