The protein, lactose, fat and mineral (Ca, P, Mg, K,Na, Zn, Cy Fe) con
centration and density of mare's colostrum of two genetical groups, Ar
abian (15) and Arabian - crosses (9), raised on Coast-cross (Cynodon d
actylon) pasture, were determined. Besides the genetical group, it was
considered the time of colostrum collection: 6h (T-1) and 12h (T-2) p
os-partum. Only protein concetration and density varied (P < 0,05) bet
ween genetical groups and time of colostrum collection. Except Ca, all
minerals were correlated with protein concentration.