Intake, performance and ingestive behaviour in lambs finished in confinement with wet brewery residue used as roughage /Consumo, desempenho e comportamento ingestivo de cordeiros terminados em confinamento com resíduo úmido de cervejaria como volumoso

The present study evaluated the effect of increasing levels of wet brewery residue (WBR) as a source of roughage on nutrient intake, performance and ingestive behaviour in lambs finished in confinement. Thirty-two uncastrated male lambs were used, weaned at 50 days of age. The treatments comprised increasing levels of WBR as roughage in the diet: 31, 44, 57 and 70%, on a dry-matter. The concentrate consisted of disintegrated corn, soybean meal, calcitic limestone and mineral salt. There was a quadratic effect (P [less than or equal to] 0.05) from the increasing levels of WBR on the intake of DM, OM, CP and TCH. The intake of EE, NDF and ADF increased linearly (P [less than or equal to] 0.01), while TDN intake showed a linear reduction (P < .0001) for increases in the level of WBR. There was a quadratic effect (P [less than or equal to] 0.010) on the average daily weight gain (ADG) from the addition of WBR to the diet. The time spent on feeding and rumination (P [less than or equal to] 0.05), expressed in minutes, showed a linear increase. Feeding rate for DM showed decreasing linear behaviour (P [less than or equal to] 0.006), while NDF rumination rate showed increasing linear behaviour (P [less than or equal to] 0.013) due to the increased levels of WBR in the diet. There was a linear increase in the time spent on each feeding activity (P [less than or equal to] 0.007) with the increase in WBR in the diet. Maximum weight gain is achieved when 46.9% WBR is used as a source of roughage in the diet, and this level can be recommended for terminating lambs in confinement. Key words: agro-industrial by-products, sheep, weight gain. O objetivo do presente estudo foi avaliar o efeito de níveis crescentes de resíduo úmido de cervejaria (RUC) como fonte de volume sobre o consumo de nutrientes, desempenho e comportamento ingestivo de cordeiros terminados em confinamento. Foram utilizados 32 cordeiros machos não castrados, desmamados aos 50 dias de idade. Os tratamentos consistiram em níveis crescentes de RUC como volumoso na dieta: 31, 44, 57 e 70%, na matéria seca. O concentrado consistia em milho desintegrado, farelo de soja, calcário calcítico e sal mineral. Houve efeito quadrático (P [less than or equal to] 0,05) dos níveis crescentes de RUC sobre o consumo de MS, MO, PB e CHT. O consumo de EE, FDN e FDA aumentou linearmente (P < .0001), enquanto o consumo de NDT apresentou redução linear (P < .0001) para aumentos no nível de WBR. Houve um efeito quadrático (P [