First Arrival helps bolster a calf's developing immune system during the first 14 days of life. Designed to naturally control scours and malnutrition by combating the pathogens that cause them. Combines egg yolk proteins, direct-fed microbials and Encrypt, a non-charcoal carbon source that provides 280 organic acids. Mix with milk replacer, whole milk or colostrum. It will give the milk a black coloration, but there is no change in palatability. Administer 24 hours after birth or later and following stress. Give 20-60 grams, depending upon the severity of scours. Repeat if necessary