Abstract The aim of this study was to evaluate the effects of replacing corn silage by coffee hulls treated with calcium oxide (CaO) on growth performance, carcass traits and meat quality parameters of lambs. Twenty-eight crossbred, non-castrated male lambs, weaned at three months of age with average initial body weight of 20.24 ± 2.40 kg were housed in individual pens. Lambs were randomly assigned to one of the four experimental treatments, which consisted of increased feeding levels of treated coffee hulls (TCH) (0, 80, 160 and 240 g/kg on DM basis). The forage concentrate ratio was 50:50 on dry matter (DM) basis and the diets were formulated to supply nutrient requirements of growing lambs with average daily gain (ADG) of 200 g. After 66 days of experimental period, lambs were slaughtered for further carcass traits and meat quality evaluations. As results, increased feeding levels of TCH in the diets led to a quadratic effect on intake of DM and its components (P 0.05). Values of final body weight and ADG were similar up to 160 g/kg of corn silage replacement. A quadratic effect was observed for shear force (WBSF) (P = 0.029), the only meat quality parameter that showed significant effect. Lower values of WBSF were observed at the intermediated levels of corn silage replacement. Coffee hulls treated with CaO can be used as corn silage substitute at levels up to 160 g/kg because lambs performance and meat quality are not affected.

中文翻译：

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用氧化钙处理过的咖啡壳喂养的羔羊的性能、胴体性状和肉质

摘要 本研究的目的是评估用氧化钙 (CaO) 处理的咖啡壳代替玉米青贮饲料对羔羊生长性能、胴体性状和肉质参数的影响。28 只杂种、未阉割的雄性羔羊，在三个月大时断奶，平均初始体重为 20.24 ± 2.40 公斤，分别饲养在单独的围栏中。羔羊被随机分配到四种实验处理中的一种，包括增加处理过的咖啡壳 (TCH) 的饲养水平（0、80、160 和 240 g/kg，以 DM 为基础）。以干物质 (DM) 为基础的粗饲料比例为 50:50，并且日粮的配方可满足生长羔羊的营养需求，平均日增重 (ADG) 为 200 克。经过 66 天的实验期后，羔羊被屠宰以进行进一步的胴体性状和肉质评估。结果，日粮中 TCH 饲喂水平的增加导致对 DM 及其成分摄入量的二次影响（P = 0.05）。最终体重和 ADG 的值与高达 160 g/kg 的玉米青贮替代品相似。观察到剪切力 (WBSF) 的二次效应 (P = 0.029)，这是唯一显示出显着影响的肉质参数。在玉米青贮替代的中间水平观察到较低的 WBSF 值。用 CaO 处理的咖啡壳可用作玉米青贮替代品，含量高达 160 g/kg，因为羔羊的性能和肉质不受影响。观察到剪切力 (WBSF) 的二次效应 (P = 0.029)，这是唯一显示出显着影响的肉质参数。在玉米青贮替代的中间水平观察到较低的 WBSF 值。用 CaO 处理的咖啡壳可用作玉米青贮替代品，含量高达 160 g/kg，因为羔羊的性能和肉质不受影响。观察到剪切力 (WBSF) 的二次效应 (P = 0.029)，这是唯一显示出显着影响的肉质参数。在玉米青贮替代的中间水平观察到较低的 WBSF 值。用 CaO 处理的咖啡壳可用作玉米青贮替代品，含量高达 160 g/kg，因为羔羊的性能和肉质不受影响。