TY - SER AU - Malhado,C.H.M. AU - Carneiro,P.L.S. AU - Malhado,A.C.M. AU - Martins,J.A.M. AU - Martins Filho,R. AU - Bozzi,R. TI - History of registered Gyr breed in brazilian northeast: population structure and genetic improvement of growth traits KW - BOVINO KW - ENDOGAMIA KW - PARÂMETRO GENÉTICO ER -