Relationships between immunoglobulin and fat-soluble vitamins in colostrum of Japanese Black multiparous cows.

Data from 19 Japanese Black multiparous cows were collected to clarify the relationships among immunoglobulin (Ig) G, IgA, -carotene, vitamin A and -tocopherol contents in colostrum of cows in order to evaluate the role of fat-soluble vitamins on colostral IgG and IgA production. Mean colostral IgG was 141mg/mL, ranging from 65 to 208mg/mL, whereas mean colostral IgA was 8.7mg/mL, ranging from 1.0 to 34.6mg/mL. Colostral IgG increased with aging in multiparous cows. There were positive correlations between colostral IgG and colostral vitamin A or colostral -tocopherol in cows, and the higher adjusted R-2 was obtained in the prediction model of colostral IgG from age and colostral vitamin A. Colostral vitamin A was positively correlated with colostral -carotene or colostral -tocopherol in cows, but there were no relationships between colostral IgA and colostral IgG or colostral fat-soluble vitamins. These results indicate that fat-soluble vitamin contents in colostrum of cows may change in similar patterns and high colostral vitamin A is related with high colostral IgG.