The effects of the inclusion level of corn silage (CS) in an ensiled total mixed ration (TMR) on feed intake, nutrient digestibility, chewing activity, and ruminal fermentation were investigated. Six Japanese Black steers during the raising period were used in a replicated 3 × 3 Latin square design with three dietary treatments: a diet containing 40.0%, 52.5%, or 65.0% CS on a dry matter (DM) basis. The three TMRs, in which the crude protein (CP) and DM levels were adjusted, were vacuum‐sealed and then stored for >30 days. Increasing the inclusion level of CS caused lower pH values and higher lactate production in the ensiled TMR. The DM intakes by the animals that received three dietary treatments were identical. The feeding of the TMR with the highest CS inclusion level resulted in slight decreases in total DM digestibility, and content and intake of total digestible nutrients, whereas the nutrient digestibilities (CP, non‐fibrous carbohydrate, acid detergent fiber, and neutral detergent fiber) were not significantly different among the dietary treatments. The eating and ruminating times by the steers fed the TMRs were elongated concomitantly with the increase in the CS inclusion level. The feeding of TMRs with higher CS inclusion led to slower fermentation in the rumen. These findings suggest that a CS inclusion level up to approx. 50% in a TMR should be considered a reasonable level for Japanese Black steers during the raising period.

中文翻译：

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饲喂日粮中含有全谷物青贮三级饲料的日本黑公牛的干物质摄入量，营养物质消化率，咀嚼活性和瘤胃发酵

研究了青贮全日粮（TMR）中玉米青贮饲料（CS）的包合水平对饲料摄入，养分消化率，咀嚼活性和瘤胃发酵的影响。在饲养期间，将六只日本黑公牛用于重复的3×3拉丁方设计，并采用三种饮食疗法：基于干物质（DM）的日粮中CS含量为40.0％，52.5％或65.0％。将三个调节了粗蛋白（CP）和DM水平的TMR真空密封，然后保存30天以上。CS的夹杂物含量增加导致青贮的TMR的pH值降低，乳酸产量增加。接受三种饮食治疗的动物的干物质摄入量相同。饲喂CS含量最高的TMR会导致总DM消化率略有下降，以及总可消化营养成分的含量和摄入量，而营养成分的消化率（CP，非纤维碳水化合物，酸性去污剂纤维和中性去污剂纤维）在饮食疗法之间没有显着差异。随着CS夹杂物含量的增加，饲喂TMR的the牛的进食和反刍时间也相应延长。饲喂CS含量更高的TMR会导致瘤胃发酵变慢。这些发现表明，CS的夹杂物含量高达约。在繁殖期间，日本黑公牛的TMR中50％应该被认为是合理的水平。随着CS夹杂物含量的增加，饲喂TMR的the牛的进食和反刍时间也相应延长。饲喂CS含量更高的TMR会导致瘤胃发酵变慢。这些发现表明，CS的夹杂物含量高达约。在繁殖期间，日本黑公牛的TMR中50％应该被认为是合理的水平。随着CS夹杂物含量的增加，饲喂TMR的the牛的进食和反刍时间也相应延长。饲喂CS含量更高的TMR会导致瘤胃发酵变慢。这些发现表明，CS的夹杂物含量高达约。在繁殖期间，日本黑公牛的TMR中50％应该被认为是合理的水平。