1. College of Animal Science and Food Engineering Sao Paulo State University Pirassununga Brazil
2. Grandfood Indústria e Comércio Ltd Dourado Brazil
3. Animal Nutrition and Production Department School of Veterinary Medicine and Animal Science Pet Nutrology Research Center University of São Paulo (USP) Pirassununga Brazil
4. Thomson Mass Spectrometry Laboratory Institute of Chemistry State University of Campinas Campinas Brazil