Pennwoods Body Builder 4000 Performance - 25LbPRE ORER Body Builder 4000 is a 40% fat, 26% protein nutritional supplement designed to promote weight gain and act as a body conditioner. Body Builder 4000 provides: Improved hoof quality. High energy concentration & calories which permit lactation mares to maintain proper body weight. High fat content that recent university research shows doubles antibody production in colostrum. A safe method of spring conditioning for horses. Ability to keep