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A. R. Riascos
Instituto de Ciencia Animal, Apartado Postal 24, San José de las Lajas, Mayabeque, Cuba.
Cuba
J. Reyes
Instituto de Investigación Pastos y Forrajes. Ministerio de la Agricultura. Av. Independencia km 81/2. Boyeros. CP 10800, La Habana, Cuba.
Cuba
L. A. Aguirre
Universidad Nacional de Loja, Ciudad Universitaria Guillermo Falconi E. Casilla Postal: Letra S, Loja, Ecuador.
Ecuador
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