Immunoglobulin variation profile in healthy holstein calves; respiratory tract on the first month of life - Bertagnon, Heloisa Godoi; Wachholz, Lúcia; Leal, M. L. R; Silva, P. E. G; Mirandola, R; Soares, P. C; Fernandes, Wilson Roberto; Benesi, Fernando José (World Buiatric Congress, 2004)