An experiment was conducted to evaluate wood chips as solely fiber source in high-concentrate diet and it system of delivery (hand-feeding vs self-feeder) in feedlot. Thirty-six steers (362±48.5 kg) blocked by bodyweight (BW) were randomly assigned to nine pens and three treatments: 1) 20% hay plus 80% commercial concentrate hand-fed; 2) 8% wood chips 92% commercial concentrate hand-fed (WCH-HF), and 3) 8% wood chip plus 92% commercial concentrate self-feed (WCH-SF). The experiment lasted 70-d. Wood chips replaced totally hay (Setaria italica) in diets which were formulated to contain similar concentration of N, energy and NDF and were offered as a total mixed ration. The animals were gradually introduced to their diets and then fed ad libitum. Body weight was recorded every 14 days. Dry matter intake (DMI) was measured daily on even weeks, and mean feed-to-gain (FG) ratio was calculated for the experimental period. Animal behavior was record during weeks 4 and 8, and physical effective fiber supply (peNDF) were estimated on weeks 5 and 9. Steers were all slaughtered on the same date, and then carcass traits were measured. The experiment was analyzed according to a randomized block design, with repeated measures. Fiber source and delivery system effects were tested through orthogonal contrasts. The replacement of GH with WCH did not affect (P>0.05) peNDF nor BW gain, but it did reduce DMI (P<0.01), improving FG (P<0.01). This change also increased resting time at the expense of ruminating activity. The replacement of HF with SF did not affect BW gain (P>0.05), but it did increase DMI (P<0.05) and FG value (P<0.01). Higher FG in SF could be related to the observed larger variation in DMI between weeks and between days (P<0.01) compared to a more stable intake pattern in HF. No differences due to fiber source or feed delivery system were observed in carcass weight (265.6±15.6 kg), back fat (11.3 ±2.1mm), or the rib-eye area (54.4 ±4.9 cm²). The inclusion up to 8% of wood chip in total replacing hay in finishing diets permit greater inclusion of concentrates increasing NEg and improving feed efficiency without detrimental effect on BW gain and carcass characteristics. Self-feeder can be an option to optimizing fed delivery in low-forage diets.

进行了一项实验，以评估木片作为高浓度日粮中的唯一纤维来源，以及它在饲养场中的输送系统（手动饲喂还是自行饲喂）。将被体重（BW）阻挡的36头ers牛皮（362±48.5 kg）随机分配给9支钢笔和3种处理方法：1）20％干草加上80％商业浓缩饲料。2）8％的木片92％的商业浓缩精料人工喂养（WCH-HF），3）8％的木片加上92％的商业浓缩精料自给饲料（WCH-SF）。实验持续了70天。用木屑代替日粮中的全部干草（Setaria italica），日粮中的氮，能量和NDF含量相似，并且以总混合日粮的形式提供。将动物逐渐引入饮食，然后随意喂养。每14天记录一次体重。每天甚至在几周内就测量干物质摄入量（DMI），并计算实验期间的平均饲料增重（FG）比。在第4周和第8周记录动物行为，并在第5周和第9周估计物理有效纤维供应（peNDF）。所有Ste牛均在同一日期被屠宰，然后测量cas体性状。根据随机区组设计对实验进行了分析，并采取了重复措施。通过正交对比测试了光纤源和传输系统的效果。用WCH代替GH不会影响peNDF（P> 0.05）或BW增高，但确实降低了DMI（P <0.01），改善了FG（P <0.01）。这种变化还增加了休息时间，但反而消耗了沉思的活动。SF替代HF不影响体重增加（P> 0.05），但确实增加了DMI（P <0.05）和FG值（P <0.01）。与HF中较稳定的摄入模式相比，SF中较高的FG可能与观察到的几周之间和几天之间DMI的较大变化有关（P <0.01）。在fiber体重量（265.6±15.6 kg），背脂肪（11.3±2.1mm）或肋眼面积（54.4±4.9 cm）方面，未观察到由于纤维来源或饲料输送​​系统引起的差异。²）。在最终日粮中，总共包含最多8％的木屑替代干草可以使更多的浓缩物包含在内，从而增加NEg并提高饲料效率，而不会增加体重和and体特性。在低草料日粮中，自饲可以是优化饲喂量的一种选择。