The objective of the experiment was to evaluate the biologic efficiency of Charolais (CH) and Nellore (NE) cows nursing CH and ½NE ½CH (produced by CH cows), NE and ½CH ½NE (produced by NE cows) calves, mantained together until weaning, on native pasture (NP) or winter (oat + italian rye grass) and summer (alexander grass) cultivated pasture (CP). Cows and calves were weighted at birth; 14; 42; 70; 98; 126; 154; 182 days; and at weaning. The cows milk yield […]

The objective of this work was to evaluate the production and composition of milk of beef cows of four genetic groups, including Charolais (C), Nellore (N), CN crossbreds daughters of C bulls, and NC crossbreds, daughters of N bulls, maintained on native pasture and submitted to different managements during pre-weaning: supplemented with rice bran (.7% of the body weight) and weaned at 42 or 63 days postpartum, or non supplemented and weaned at 63 days. The cow age varied from […]

The objective of the experiment was to evaluate the performance of Charolais (CH) and ½Nellore (NE) ½CH (produced by CH cows), NE and ½CH ½NE (produced by NE cows) calves, mantained with the cows until weaning, on native pasture (NP) or winter (oat + italian rye grass) and summer (alexander grass) cultivated pasture (CP). Sixty straigthbred or crossbreds calves were used, and weighted at birth; 14; 42; 70; 98; 126; 154; 182 days; and at weaning. The cows milk yield […]

The objective of this experiment was to evaluate the composition and average daily milk yield of Charolais (CH) and Nellore (NE) cows, mantained on native pasture (NP) or winter (oat plus italian rye grass) and summer (alexander grass) cultivated pasture (CP). Sixty cows nursing straightbred or crossbred calfs were used, during 182 days, according to the following treatments: CHNP = CH cows mantained on NP; NENP = NE cows mantained on NP; CHCP = CH cows mantained on CP; and […]

Data on 23,251 Nelore calves weaned from 1994 to 1997, belonging to Agropecuária Jacarezinho Ltda., were analyzed to estimate the influence of environmental effects of age of dam, julian date of birth and age of calf at weaning on visual scores of conformation (C), precocity (P) and musculature (M). All effects significantly influenced the visual scores. The analyses showed that the calves with the best scores of C, P and M at weaning were those from dams with 7, 8 […]