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The objective of this study was to evaluate the intake, ruminal fermentation, microbial protein synthesis, balance of nitrogen compounds and ingestive behavior of steers grazing supplemented with increasing levels of crude protein. Four crossbred steers were used, with an average age of 24 months, average body weight of 400 kg, fitted with rumen cannula. The animals were housed in individual paddocks in Latin square design 4 x 4. The experimen-tal supplements were composed of different protein levels: T00= mineral supplement (control); T20= Supplement concentrate with 20 % crude protein; T40= Supplement concentrate with 40 % crude protein; T60= concentrated supplement with 60 % CP. There was no effect on dry matter intake. There was effect on concentrations of valerate, but were not observed linear or quadratic. The T60 treatment showed lower supplement intake velocity than the other. Protein supplementation levels did not influence the dry matter intake, microbial protein synthesis and nitrogen balance, however they influenced the concentrations of short-chain fatty acids and intake rate of protein supplements.

Metabolismo nitrogenado em bovinos suplementados a pasto durante a transição águas seca