We investigated the effects of wood kraft pulp (KP) feeding on feed digestibility and rumen fermentation of Japanese Black (JB) steer in the middle fattening stage. The feeding experiment was carried out a replicated 3 × 3 Latin square design using six JB steers (16.2 ± 0.8 months of age). Steers were fed rice straw and three concentrated feeds: commercial formula feed (control), formula feed containing 7.5% KP on a dry matter (DM) basis (7.5% KP), and formula feed containing 15% KP on a DM basis (15% KP). Feed digestibility and rumen fermentation parameters were recorded for 3 days during the measurement period, after an adaptation phase of 11 days. There was no significant difference in DM intake per day among diets. A slightly higher digestibility of neutral detergent fiber was observed in steers fed 15% KP, compared with those fed other diets (P = 0.059). The butyric acid ratio in rumen fluid was higher in steers fed KP diets than in steers fed control (P = 0.083). The average ruminal pH was unaffected by KP diets. This study suggests that replacing 15% of concentrated feed with KP has little effect on feed digestibility and rumen fermentation in JB fattening steer.

中文翻译：

---

木牛皮纸浆饲喂对育肥中期日本黑肉牛饲料消化率和瘤胃发酵的影响

我们研究了木牛皮纸浆 (KP) 饲喂对育肥中期日本黑 (JB) 牛饲料消化率和瘤胃发酵的影响。使用 6 头 JB 阉牛（16.2 ± 0.8 个月大）进行了重复的 3 × 3 拉丁方设计喂养实验。给小牛喂食稻草和三种浓缩饲料：商业配方饲料（对照）、以干物质 (DM) 计含 7.5% KP 的配方饲料 (7.5% KP) 和以 DM 计含 15% KP 的配方饲料 (15 % KP)。在 11 天的适应阶段之后，在测量期间记录饲料消化率和瘤胃发酵参数 3 天。不同饮食每天的 DM 摄入量没有显着差异。与饲喂其他日粮的牛相比，饲喂 15% KP 的牛中性洗涤纤维的消化率略高（P  = 0.059）。饲喂 KP 日粮的公牛瘤胃液中的丁酸比率高于饲喂对照的公牛 ( P  = 0.083)。平均瘤胃 pH 值不受 KP 日粮的影响。该研究表明，用 KP 替代 15% 的浓缩饲料对 JB 育肥公牛的饲料消化率和瘤胃发酵几乎没有影响。