Alexander George Razook, Leopoldo Andrade de Figueiredo, Luiz Martins Bonilha Neto, Joslaine Noely dos Santos Gonçalves Cyrillo1,2, Maria Eugênia Zerlotti Mercadante, José Benedito de Freitas Trovo, Ana Claudia Ruggieri, Irineu Humberto Packer
Since 1933 the Gir, Guzerá and Nelore Zebu breeds, has been preserved and selected at the Experimental Station of Sertãozinho (IZ-SP)-Brazil. The Station also received a small Caracu herd in an effort to save it from extinction in Brazil. The Caracu is a European origin cattle, which is in Brazil since XVI century. All these breeds are being submitted to a selection based on yearling weights and the genetic changes are being obtained with a Nelore control line. The amount of cows ranges from 80 (Gir) to 150 (Caracu) using 4 (Control) to 8 (Caracu) bulls. The inbreeding is being maintained at intermediate levels and the genetic changes for primary and correlated traits are significant. Since most of the beef production in Brazil is on grassland, these tropical adapted breeds are important genetic resources to be preserved.
7th World Congress on Genetics Applied to Livestock Production, August 19-23, 2002, Montpellier, France