Selenium addition to colostrum increases immunoglobulin G absorption by newborn calves.

The objective of this study was to show a new function of Se in IgG absorption from colostrum by newborn calves. The same amount and quality of colostrum with or without Se addition was fed to paired calves (n = 60) 4 times at <2, 12, 24, and 36 h after birth, respectively. Four-time feeding of colostrum containing 1.0 ppm Se significantly increased IgG amount in the blood plasma of calves 24 h after birth; however, its effect was small (about 20% increase). Although the addition of 3.0 ppm Se once at the first colostrum feeding was more effective on IgG absorption, its significant effect was a 42% increase on average. The increased IgG concentration of blood plasma continued for about 2 wk. It is known that the absorption of colostrum IgG is mediated by intestinal pinocytosis, which continues for only 24 h after birth. The addition of Se to colostrum might directly activate this physiological pinocytosis of intestinal epithelial cells because of the rapidity of the reaction. This effect is not nutritional but rather pharmacological. Supplemented Se also resulted in its increased concentration in blood plasma. Selenium is an essential mineral for animals; however, newborn calves are always deficient in Se at birth. Application of this method in calves would also provide an immediate supply of Se and might contribute to the development of the immune system of calves. This study showed that Se supplementation to colostrum increased IgG amount and Se concentration in blood plasma in newborn calves.