The present study was carried out in the city of Ceara-Mirim in agreste of Rio Grande do Norte state, in a beef farm producing precocious steers. Thirteen steers of two different breeding Angus x Nelore (¾ Angus x 1/4 Nelore and ½ Angus x Nelore) were studied for productive performance, corporal measures and adaptability characteristics. The variables studied for herd performance were the mean weight daily gain (GPMD) and live weight being the animals were weighted in loco. For the evaluation of corporal measures were observed the length, anterior height, posterior height and thoracic perimeter with use of adapted ruler and metric ribbon. Rectal temperature, coat thickness, length and number of coats for unit of area had been evaluated to compose the adaptation analysis, beyond meteorological variables as temperature of dry bulb, humid bulb, relative humidity of air and black globe located to the sun and to the shade. The rectal temperature and the meteorological variables had been observed in two schedules, 10:00 h and 15:00 h. The period of collection for herd performance, corporal measures, rectal temperature and meteorological variables was from August of 2006 to September of 2007, totalizing 13 evaluations, while that for coat collection it was from January to March and July of 2007. The group ¾ Angus x ¼ Nelore presented greater live weight to weaning (181,60 kg) and to the end of the experiment (419,80 kg), when compared with ½ Nelore Angus, that showed weaning weight of 158,57 kg and to the end of the experiment of 390,0 kg (P<0,01). It suits to emphasize that the initial weight was the same for two groups (103,03 Kg). The crossbreed with higher proportion of Angus breed also had superiors body measures being statistically significant. This means that the lively weight of the animal was accompanied by his growth, when bigger animals were the heaviest. There was correlation between these variables and the lively weight, being highly significant (P <0,01). For rectal temperature, the crossbreed with higher proportion of Nelore (1/2) breed, showed higher value (40,4o C), perhaps for inherent characteristics of the zebu breed, which have bigger stock of corporal heat and lesser loss of water. The value for the group ¾ Angus x ¼ Nelore was 39,96o C (P <0.01). However, in what it refers to the schedule of data collection, the rectal temperatures had not significant differences, what can suggest a good capacity of losing heat by the animals. For the coat characteristics, there was no difference between the groups in the thickness of the coat and number of hairs, whereas the hairs of the animals of the group ¾ Angus x ¼ Nelore were longer. A bigger length for this group was already waited, since the Taurus presents finer and longer hairs than the zebu breed, this is a adaptive characteristic due to the climate of its country of origin. The thermal comfort was considered within the normality range, being the mean value of the CTR of 516,6 w/m2 and ITGU of 78,3. The genetic group ¾ Angus x ¼ Nelore presented better productive performance and satisfactory adaptive capacity.