RESUMEN
Data from 26 Japanese Black cows were collected to clarify the effects of supplemental ß-carotene on colostral immunoglobulin (Ig) and plasma ß-carotene and Ig in the cows. Cows were assigned to control or ß-carotene groups from 21 days before the expected calving date to 60 days after parturition. Supplemental ß-carotene was provided at 500 mg/day in the ß-carotene group. Supplemental ß-carotene drastically increased plasma ß-carotene concentrations in the cows from parturition to 60 days after parturition, and plasma ß-carotene concentrations in the control and ß-carotene groups at parturition were 202 and 452 µg/dl, respectively. Supplemental ß-carotene had no effects on plasma IgG1 , IgA or IgM concentrations at parturition. Supplemental ß-carotene increased colostral IgG1 concentrations in the cows, but colostral ß-carotene, IgA and IgM concentrations were not affected by supplemental ß-carotene. These results indicate that supplemental ß-carotene is effective to enhance colostral IgG1 concentrations and plasma ß-carotene concentrations in Japanese Black cows.