Kennya Siqueira Embrapa Dairy Cattle   Rua Eugênio do Nascimento, 610, Dom Bosco Juiz de Fora, MG 36038330 Brazil   kennya@cnpgl.embrapa.br   www.cnpgl.embrapa.br           JEL Areas: C1 : Econometric and Statistical Methods: General F5 : International Relations and International Political Economy: General