1. Laboratory of Nuclear Instrumentation, Centre for Nuclear Energy in Agriculture, University of São Paulo, Piracicaba, SP 13416000, Brazil
2. Department of Ecological Science, Faculty of Science, Vrije Universiteit, De Boelelaan 1085, 1081HV Amsterdam, The Netherlands
3. Animal Nutrition Laboratory, Centre for Nuclear Energy in Agriculture, University of São Paulo, Piracicaba, SP 13416000, Brazil