Abstract
This experiment was carried out in the Agua Limpa Farm, of the University of Brasilia, aiming to estimate the level of selenium and its variation during the year in some cultivated pastures of the cerrados region ( Andropogon gayanus var. bisquamulatus, Brachiaria decumbens and Brachiaria ruziziensis ). On the other hand, it was determined the effects of the supplementation, through intramuscular applications, in 24 Bergamacia weaned lambs. Pastures samples were collected trying to simulate the animal grazing, at intervals of 84 days, and different chemical methods of determination of selenium were evaluated. The fluorometric method has the best response and the levels of the samples varied from 0.025 to 0.075 ppm. In relation to the lambs, difference in weight gains were not statistically significant (P>0.05). KEY-WORDS: Brazilian savannas (“cerrados”); sheep; selenium supplementation.
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