Izumi Kenichi, Tamura Tatuya, Fujii Ryoya, Nakatsuji Hiroki, Morita Shigeru
College of Agriculture, Food and Environment Sciences, Rakuno Gakuen University, Ebetsu, Hokkaido, Japan.
Anim Sci J. 2019 Feb;90(2):205-213. doi: 10.1111/asj.13149. Epub 2018 Dec 16.
The present study examined the effects of substituting kraft pulp (KP) with corn silage (CS) on dry matter intake (DMI), ruminal mat and rumen fermentation characteristics, and rumination. Four non-lactating, rumen-cannulated Holstein cows were fed a CS diet comprising 36% grass silage (GS) and 64% CS or a KP diet comprising 36% GS, 57% KP, and 7% soybean meal. DMI was significantly lower in cows fed the KP diet than in those fed the CS diet (p < 0.05), whereas rumination time did not significantly differ between the treatments. Dry matter content in the rumen immediately before and 3 h after feeding was significantly higher in cows fed the KP diet than in those fed the CS diet (p < 0.05). The consistency and thickness of the ruminal mat did not significantly differ between the treatments. The ruminal mean retention time of feed particles tended to be longer in cows fed the KP diet than in those fed the CS diet (p < 0.10). The ruminal digestion rate of KP was comparable to that of GS and CS. Because ruminal mat was formed and rumination was stimulated, KP was considered to have the equivalent physical effectiveness as CS.
本研究考察了用玉米青贮料（CS）替代硫酸盐浆（KP）对干物质摄入量（DMI）、瘤胃垫和瘤胃发酵特性以及反刍的影响。选用4头非泌乳、安装了瘤胃瘘管的荷斯坦奶牛，给它们饲喂一种由36%青贮牧草（GS）和64% CS组成的CS日粮，或一种由36% GS、57% KP和7%豆粕组成的KP日粮。采食KP日粮的奶牛的DMI显著低于采食CS日粮的奶牛（p < 0.05），而两种处理之间的反刍时间没有显著差异。采食KP日粮的奶牛在饲喂前和饲喂后3小时瘤胃内的干物质含量显著高于采食CS日粮的奶牛（p < 0.05）。两种处理之间瘤胃垫的稠度和厚度没有显著差异。采食KP日粮的奶牛饲料颗粒在瘤胃内的平均滞留时间往往比采食CS日粮的奶牛更长（p < 0.10）。KP在瘤胃内的消化率与GS和CS相当。由于形成了瘤胃垫并刺激了反刍，因此认为KP具有与CS相当的物理效应。
