1. Dep. of Animal Science Federal Rural Univ. of Pernambuco Recife Pernambuco Brazil
2. Agronomic Institute of Pernambuco Arcoverde Pernambuco Brazil
3. North Florida Research and Education Center Univ. of Florida Marianna FL 32446 USA
4. Post‐Doc Fellow, EMBRAPA Agrobiology Seropédica RJ Brazil