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Investigations were made of the effects on nitrogen retention of continuous intravenous infusions of branched-chain amino acids (BCAA) with glucose. Eight wether lambs (35 kg) fed a full feed diet (2.68 Meal ME and 129 g CP kg 1 , DM basis) twice daily (50 g DM W 0 7 5 d 1 ) at a level of 1.2 times their maintenance energy requirement were continuously infused intravenously (jugular) with L-leucine (Leu), L-isoleucine (He) and L-valine (Val). Infusion rates were 2.1, 1.5 and 1.7 g lamb" d 1 , respectively, estimated to be about 50 % of that absorbed from the gastrointestinal tract and / or required for muscle protein synthesis. Glycine was added to the infusion solutions to equalize the total N infused. Glucose (12 g W kg" 7 d"') was also supplemented in the infusion solutions to maximise N-retention. Two 4 x 4 plus extra-period Latin squares were used. In square I , where the amino acids were infused individually, the treatments were: control, Leu, He and Val and in square II the treatments were: control, Leu, Leu + He and Leu + He + Val. Each period lasted 6 days. Digestibility coefficients of DM and OM were 75.8 and 77.1 %, respectively, and were not affected by the treatment. Average N-digestibility was 67.1%; the He + Leu treatment increased N-digestibility (P<0.03) compared to control. None of the individually infused amino acids significantly altered urinary-N (avg. 41%) of total N-intake) or N-balance (avg. 22 % of total intake). In both squares, Leu alone failed to affect urinary-N or N-retention. Nitrogen balance was statistically (P<0.05) improved by 42%), when Leu was infused jointly with He. It is concluded that Leu infusion alone does not affect N-utilization in growing lambs, but when Leu is combined with He, N-utilisation is improved. The infusion of Val had little effect on N-utilization.

Role of branched-chain amino acid intravenous infusion in nitrogen utilization in growing ruminants