USO DE URÉIA E IONÓFOROS NA SUPLEMENTAÇÃO DE BEZERROS DESMAMADOS

The nutrition without any doubt is the parameter that most alters the age of slaughtering to bovine, therefore, our climatic conditions of drought and the seasonal production of forage limits the availability of nutrients, demanding dietary supplementation. A strategy of appropriate feeding would be destined to improve the forage use, maximizing the consumption and digestibility of the available forage. Among the alimentary supplements ionophores were initially used as coccidiostatic for birds, and during the seventies, it began to be used in the ruminant diet. The most used ionophores for ruminant are the sodium monensine produced by one strain of bacteria Streptomyces cinnamonensis and the sodic lasalocide produced by Streptomyces lasaliensis strain. The aim of this work was to evaluate the use of the ionophores (lasalocide and monensine) and urea, in Nelore calves as protein supplementation, in both males and females, during the reproduction cycle in the dry period. The study took place at Sol Nascente Farm, located at Caarapó, MS county. An entirely random design was adopted, with the treatments arranged as 2 sex by 4 additives as protein supplementation (without addictives or with urea, lasalocide or monensine), totaling 8 treatments with 12 repetitions. Analyzing the daily average weight increments in the total period the weight obtained did not show significant difference neither in the witness and among the animals fed with the addition of the additives, nor by sex