Nishimura Keiko, Kurosu Kazuhiro, Terada Fuminori, Mizuguchi Hitoshi, Sato Shigeru, Kushibiki Shiro
Miyazaki Livestock Research Institute, Miyazaki, Japan.
Nippon Paper Industries Co. Ltd., Tokyo, Japan.
Anim Sci J. 2019 Feb;90(2):189-195. doi: 10.1111/asj.13131. Epub 2018 Dec 16.
The effect of wood kraft pulp (KP) feed on dietary digestibility, ruminal fluid pH, rumen fermentation characteristics, and milk production performance in lactating dairy cows was examined. Four lactating dairy cows were used for the feeding experiment by the cross-over design. The control group and KP group were set up as treatments. The control group was fed total mixed ration (TMR) (40% roughage and 60% concentrate) and the KP group was fed TMR containing 12% KP that replaced half of the rolled corn in the control diet. The dry matter intake, digestibility of the feed components, and milk yield were not significantly different between control group and KP group. The number of times that the ruminal fluid pH was below 6.1 tended to decrease in the KP group compared to the control group (p < 0.10). The acetic acid ratio in the ruminal fluid of the KP group increased compared to the control group (p < 0.05) and the propionic acid ratio in the ruminal fluid of the KP group decreased compared to the control group (p < 0.05). The acetate:propionate acid ratio was increased in the KP group compared with the control group (p < 0.05). Lipopolysaccharide levels in the ruminal fluid of the KP group tended to decrease compared to the control group (p < 0.10). Based on these results, it was indicated that the use of KP feed for lactating dairy cows induced the same rumen fermentation characteristics as those in cows given a large amount of roughage without depressing milk productivity. Therefore, KP could be a valuable feed resource substitute for grains, which would also reduce the risk for subacute rumen acidosis.
研究了木浆粕（KP）饲料对泌乳奶牛日粮消化率、瘤胃液pH值、瘤胃发酵特性和产奶性能的影响。采用交叉设计，选用4头泌乳奶牛进行饲养试验。设置对照组和KP组作为处理组。对照组饲喂全混合日粮（TMR）（40%粗饲料和60%精饲料），KP组饲喂含有12% KP的TMR，该TMR替代了对照日粮中一半的压片玉米。对照组和KP组之间的干物质摄入量、饲料成分消化率和产奶量没有显著差异。与对照组相比，KP组瘤胃液pH值低于6.1的次数有减少趋势（p < 0.10）。与对照组相比，KP组瘤胃液中的乙酸比例增加（p < 0.05），而KP组瘤胃液中的丙酸比例降低（p < 0.05）。与对照组相比，KP组的乙酸:丙酸比例增加（p < 0.05）。与对照组相比，KP组瘤胃液中的脂多糖水平有降低趋势（p < 0.10）。基于这些结果，表明在泌乳奶牛中使用KP饲料可诱导出与大量饲喂粗饲料的奶牛相同的瘤胃发酵特性，且不会降低产奶性能。因此，KP可以成为谷物的一种有价值的饲料资源替代品，这也将降低亚急性瘤胃酸中毒的风险。
