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This experiment aimed to evaluate the effects of different amounts of a protein supplement on intake, digestibility, and metabolic characteristics of nitrogen utilization in cattle during the dry-to-rainy transition period. Five Nellore bulls fitted with rumen cannulae, averaging 273 kg of body weight (BW), were used. The animals grazed five signal grass paddocks (0.34 ha). The experiment was carried out according to a 5 × 5. Latin square design. The treatments consisted of five different amounts of offered supplement: 0, 1.25, 2.5, 5.0, and 10.0 g/kg BW. The supplement was composed by soybean meal, corn grain, urea and ammonium sulphate in order to present 340 g of crude protein (CP) per kg as fed. The organic matter (OM), CP, and digested OM intakes increased linearly (p 0.10) on pasture intake. The total and ruminal digestibility of OM and CP were linearly increased (p<0.01) as supplement amount increased. The increase in the supplement amount increased linearly (p<0.01) the nitrogen balance in the rumen and animal body, and the production of microbial nitrogen in the rumen. Protein supplementation for grazing cattle during dry-to-rainy transition season does not affect pasture intake. Despite this, the supplementation increases the nitrogen balance and the efficiency of nitrogen utilization. This seems to be caused by an improvement on the nitrogen status in the animal metabolism.

Desempenho nutricional de bovinos em pastejo durante o período de transição seca-águas recebendo suplementação proteica