1. Laboratory of Swine Research; School of Veterinary Medicine and Animal Science; University of Sao Paulo; Pirassununga Brazil
2. Laboratory of Andrology and Technology of Swine Embryos; School of Veterinary Medicine and Animal Science; University of Sao Paulo; Pirassununga Brazil
3. Department of Animal Nutrition and Production; School of Veterinary Medicine and Animal Science; University of Sao Paulo; Pirassununga Brazil