Adequate disease resistance in the immediate post parturient period is essential for the health and survival of a calf. Immunoglobulins (Igs) are proteins produced in response to stimulation by antigens (foreign substances) that subsequently inactivate or destroy these antigens. The sera of neonatal calves is essentially devoid of Ig or agammaglobulinaemic (Stromont, 1972). Thus they are entirely dependent on the Igs received through the ingestion of colostrum to provide passive immunity. IgG1 is the most abundant Ig present in colostrum. The IgG1 concentration of the colostrum, in addition to colostrum intake, influences the immune status of the calf. McGee (1997) has identified breed effects for serum and colostrum Ig status in suckler cows and consequently serum Ig status of their progeny. The objective of this study was to determine the effect of cow breed type on (a) cow serum and colostrum IgG1 concentration and (b) subsequent calf serum IgG1 concentration and zinc sulphate turbidity (Z.S.T.) units.