El-Vi farms in Newark, N.Y., uses a rotation system to organize refrigerated colostrum. After colostrum has been harvested and tested for quality, employees use a dry-erase marker to write the date and quality on each bottle. The freshest bottles are placed on the left side of the refrigerator. Bottles rotate from left to right. Employees have been trained to grab a bottle from the right side and feed a newborn calf within two hours of birth. The calf supervisor checks the dates on the bottles daily so that calves do not receive colostrum that is more than five to seven days old. A three-day rotation is recommended, says George Andrew, one of the partners. However, that would mean more dependence on frozen colostrum. At this point, the farm lacks the freezer capacity for it.