使用一种复杂的非 TDN 基础模型（DVE/OEB 系统）预测不同品种的谷物燕麦对反刍动物的微生物蛋白质合成、内源性蛋白质、降解平衡和总真实可吸收蛋白质供应。
Using a complex non-TDN based model (the DVE/OEB system) to predict microbial protein synthesis, endogenous protein, degradation balance, and total truly absorbed protein supply of different varieties of cereal oats for ruminants.
机构信息
Department of Animal and Poultry Science, College of Agriculture and Bioresources, University of Saskatchewan, Saskatoon, SK, Canada.
出版信息
Anim Sci J. 2009 Jun;80(3):273-9. doi: 10.1111/j.1740-0929.2009.00641.x.
Recently a new super-genotype of oat has been developed in the Crop Development Center called CDC SO-I ('SuperOat': low lignin and high fat). In a previous study, we evaluated total metabolizable protein using a TDN-based model-NRC-2001 which is popular in North America. However, the TDN-based NRC model is not accepted universally. The objectives of this study were to use a complex non-TDN based model, the DVE/OEB system, to evaluate potential nutrient supply to ruminants from the SuperOat in comparison with two normal varieties of oats (CDC Dancer and Derby) in western Canada. The quantitative predictions were made in terms of: (i) truly absorbed rumen synthesized microbial proteins in the small intestine; (ii) truly absorbed rumen undegraded feed protein in the small intestine; (iii) endogenous protein in the digestive tract; (iv) total truly absorbed protein in the small intestine; and (v) protein degraded balance. Results showed that using the DVE/OEB system to predict the potential nutrient supply, it was found that the SuperOat had similar truly absorbed rumen synthesized microbial protein levels (61, 63, 59 g/kg DM, P > 0.05, for SuperOat, CDC Dancer and Derby, respectively), higher truly absorbed rumen undegraded feed protein than CDC Dancer (22 vs. 17 g/kg DM P < 0.05, for SuperOat, CDC Dancer, respectively), but similar to Derby (22 vs. 21 g/kg DM; P > 0.05), and similar endogenous protein (16, 16, 18 g/kg DM; P > 0.05). Total truly absorbed protein in the small intestine is only numerically higher in the SuperOat (67 vs. 65, 62 g/kg DM, P > 0.05, for CDC Dancer and Derby, respectively). However, the protein degraded balance was significantly different (P < 0.05) with a positive value for the SuperOat (7.0 g/kg DM) and negative values for two normal varieties (-1.5, -6.8 g/kg DM for CDC Dancer and Derby, respectively). In conclusion, the model predicted significantly different protein degradation balance. The SuperOat had positive degradation balance but other two normal varieties had negative protein degraded balance However, the SuperOat had similar total absorbed protein value to the two normal varieties of oats.
最近，作物发展中心（Crop Development Center）开发出一种名为 CDC SO-I（“超级燕麦”：低木质素和高脂肪）的新型超级燕麦品种。在之前的研究中，我们使用北美流行的基于 TDN 的 NRC-2001 模型评估了总可代谢蛋白。然而，基于 TDN 的 NRC 模型并不被普遍接受。本研究的目的是使用复杂的非 TDN 基础模型 DVE/OEB 系统，来评估与加拿大西部的两种普通燕麦品种（CDC Dancer 和 Derby）相比，超级燕麦对反刍动物的潜在营养供应。通过以下方面进行了定量预测：（i）小肠中真正吸收的瘤胃合成微生物蛋白；（ii）小肠中真正吸收的瘤胃未降解饲料蛋白；（iii）消化道内源性蛋白；（iv）小肠中总真正吸收蛋白；（v）蛋白降解平衡。结果表明，使用 DVE/OEB 系统预测潜在养分供应时，发现超级燕麦具有相似的真正吸收的瘤胃合成微生物蛋白水平（分别为 61、63、59 g/kg DM，P > 0.05，超级燕麦、CDC Dancer 和 Derby），比 CDC Dancer 具有更高的真正吸收的瘤胃未降解饲料蛋白（22 对 17 g/kg DM，P < 0.05，超级燕麦、CDC Dancer），但与 Derby 相似（22 对 21 g/kg DM；P > 0.05），并且内源性蛋白相似（16、16、18 g/kg DM；P > 0.05）。小肠中真正吸收的总蛋白在超级燕麦中仅在数值上更高（67 对 65、62 g/kg DM，P > 0.05，CDC Dancer 和 Derby）。然而，蛋白降解平衡显著不同（P < 0.05），超级燕麦呈正值（7.0 g/kg DM），而两种普通品种呈负值（CDC Dancer 和 Derby 分别为-1.5、-6.8 g/kg DM）。总之，模型预测了显著不同的蛋白降解平衡。超级燕麦具有正的降解平衡，而其他两个普通品种具有负的蛋白降解平衡。然而，超级燕麦的总吸收蛋白值与这两种普通燕麦品种相似。
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