Desempenho em confinamento de machos bovinos inteiros Canchim, Aberdeen angus e cruzamentos recíprocos

daily dry matter intake (cms), feed conversion (ca) and average daily gain (adg) of 118 canchim (cn), aberdeen angus (ab) and reciprocal crossbred (cnab and abcn) males were analyzed. the cnab group included f1, 3/4cn+1/4ab, 5/8cn+3/8ab and 11/16cn+5/16ab. the abcn included f1, 5/8ab+3/8cn and 11/16ab+5/16cn. these animals were fed in individual stalls for 84 to 95 days receiving corn silage ad libitum plus a concentrate containing 17.8% cp and 79% tdn fed 1% of live animal weight per day. the traits were first analyzed by a model that included the fixed effects of year, genetic group, period and year x period interaction and the random effect of animal within genetic group within year. the ratio between the dry matter of the concentrate to the dry matter of the silage was included as a continuous variable in the model. later, the traits were analyzed by a multiple regression model that included coefficients for the expected fractions of ab in the genotypes of animals and dams and for expected individual and maternal heterozygosities. means for cms, ca and adg were, respectively, 2.44kg of dm/100kg of live weight/day, 6.97kg of dm/kg of adg and 1.435kg/day. genetic group influenced cms (p<0.01) and adg (p<0.06). the ab was equal to abcn, showing higher cms and lower adg than the other two groups. there was no heterosis for any of the traits indicating that rotational crossing between canchim and aberdeen angus was equal to the average of the parental breeds.