摘要
Zenobi, M. G., Lardner, H. A., Jefferson, P. G. and McKinnon, J. J. 2015. Effect of feeding strategically blended feed pellets on rumen fermentation and nutrient digestion. Can. J. Anim. Sci. 95: 243–254. Five rumen-cannulated heifers (631±31 kg) were used in a 5×5 Latin square design to evaluate the effect of feeding blended by-product feed pellets (BP) on rumen fermentation and nutrient utilization. Four BP were formulated to be high in starch (HS) or fat (HF) and either low (LSP) or high (HSP) in soluble crude protein. The control diet consisted of 49.1% forage and 50.9% barley-based concentrate. Treatments were 50.3% forage and 49.7% BP (DM). Heifers fed HF BP had higher (P=0.05) mean pH values than those fed the control diet and tended (P=0.07) to have higher mean pH than those fed the HS BP. Feeding HF BP decreased (P<0.05) rumen propionate concentration without affecting acetate or total volatile fatty acid concentration. Rumen ammonia-nitrogen (N) levels and digestibility of crude protein was highest (P<0.05) for HS, intermediate for HF, and the lowest for the control. Feeding HF BP reduced (P<0.05) gross energy digestibility and digestible energy content relative to both the control and HS diets while both BP increased (P<0.01) their extract digestibility compared with the control. There was minimal effect of pellet soluble crude protein content. Total N excretion (% of N intake) was not affected (P>0.05) by treatment. These results indicate that BP had no adverse effects on rumen fermentation or apparent nutrient digestibility and did not result in issues with excess nutrient excretion. As such BP can be used as an alternative energy source in backgrounding diets to cereal grains and can help counteract volatility in feed grain prices.
摘要译文
Zenobi，M. G.，Lardner，H.A.，Jefferson，P.G.和McKinnon，J.J.2015。喂养策略性混合饲料颗粒对瘤胃发酵和营养消化的影响。能够。 J.Anim。科学95：243–254。在5×5的拉丁方设计中，使用了5个瘤胃空心小母牛（631±31 kg），以评估混合饲料副产物饲料颗粒（BP）对瘤胃发酵和养分利用的影响。四个BP被配制为高淀粉（HS）或脂肪（HF），低（LSP）或高（HSP）可溶性粗蛋白。对照饮食包括49.1％的草料和50.9％的基于大麦的浓缩物。处理为50.3％的草料和49.7％的BP（DM）。饲喂HF BP的小母牛的平均pH值高于对照饲喂的小母牛（P = 0.07），并且倾向于饲喂HF BP的小母牛的平均pH值高于HS BP。饲喂HF BP降低了瘤胃丙酸酯浓度（P <0.05），而不影响乙酸盐或总挥发性脂肪酸的浓度。瘤胃中氨氮（N）和粗蛋白的消化率最高（HS 0.05）。这些结果表明，BP对瘤胃发酵或表观的养分消化率没有不利影响，并且不会导致养分过多的问题。因此，BP可以用作谷物谷物日粮的替代能源，并有助于抵消饲料谷物价格的波动。
M. G. Zenobi;[1] H. A. Lardner;[2] P. G. Jefferson;[2] J. J. McKinnon[1]. Effect of feeding strategically blended feed pellets on rumen fermentation and nutrient digestion[J]. Canadian Journal of Animal Science, 2015,95(2): 243-254