Relationship among productive and economic variables of beef cattle in Brazil oleh Rogério Semchechem, Simone Fernanda Nedel Pértile, Sandra Maria Simonelli, Maria Eugênia Andrighetto Canozzi, Luiz Fernando Coelho da Cunha Filho, Mateus Ludovico Zamboti, Marilice Zundt, Marcelo Diniz dos Santos, Antonio Chaker El Memari Neto, Fabiola Cristine de Almeida Rego