For a lamb feedlot system became competitive it is essential that an equilibrate nutrition
and functional feeding management happens naturally. Therefore, this experiment has the
objective to evaluate the efficiency of whole corn grain diet on lambs performance and carcass
quality parameters and ruminal papillae development. During the experiment twenty
Dorper/Santa Inêscrossbred lambs were used, divided randomly in two treatments: control
diet and whole grain diet. The experimental design was completely randomized design
and data analysis done by SISVAR using the Tukey test at 5% of probability. No statistical
differences were observed on the characteristics evaluated for performance and carcass as
well as the length and width of ruminal papillae. The composition of the diet together with
the weight gain potential of the lambs can explain the good average daily weight gain of
0.284 kg. The initial body condition average was 2.1 (thin) and improved at the end of the
trial period achieving3.15 (normal). Carcass yield reached 46.24%, the results is between
the range ideal for specialty meat breeds ranging from 40 to 50%. The carcass conformation,
fat cover conformation and the thickness of subcutaneous fat found can be classified as
medians. Also there was no difference in the characteristics of ruminal papillae. Thus, it is
concluded that the use of whole grain diet did not influence the characteristics evaluated;
and the choice of diet should be made with regard to profitability, simplicity of use and
availability of forage in feedlot.