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首页> 外文期刊>Animal Feed Science and Technology >Effects of fungal infested steam-flaked corn on characteristics of ruminal and total tract digestion in steers.
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Effects of fungal infested steam-flaked corn on characteristics of ruminal and total tract digestion in steers.

机译：真菌侵染的玉米片对on牛瘤胃和全道消化特性的影响。

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摘要

Four Holstein steers (407+or-4 kg) with cannulas in the rumen and proximal duodenum were used in a 4x4 Latin Square design experiment. Treatments consisted of a 755 g/kg steam-flaked corn-based finishing diet in which fungal infested steam-flaked corn replaced 0, 150, 300, and 450 g/kg of the control flaked corn. The yeast and mold counts averaged 2.9x102, and 1.2x104 CFU/g, respectively, for control flaked corn, and 7.0x105, and 6.2x106 CFU/g, respectively, for fungal infested flaked corn. There were no treatment effects (P>0.10) on ruminal pH or volatile fatty acids molar proportions. Ruminal digestion of organic matter (OM; linear component, P<0.10), and feed N (linear component, P<0.05) decreased with increasing levels of fungal infested flaked corn in the diet. There were no treatment effects (P>0.10) on net microbial N synthesis. Amino acid intake increased linearly (P<0.01) as fungal infested flaked corn was augmented, and amino acid flow to duodenum was increased (P<0.01) with the highest fungal infested flaked corn level. Total tract digestion of OM, N and energy decreased (linear component, P<0.05) with increasing SFM. Ruminal and total tract digestion of ADF and starch were not affected (P>0.10) by treatments. It is concluded that mold infestation diminishes the feeding value of steam-flaked corn. The consequence was not related to effects of fungal growth on characteristics of digestion, but rather, to loss of readily digestible nutrients (starch) through the spoilage process, and to a lesser extent, decreased N digestibility. On the other hand, the metabolizable protein value was greater for fungal infested flaked corn.
机译：在4x4 Latin Square设计实验中，使用了四个瘤胃和十二指肠近端带有插管的荷斯坦ste牛（407 + or-4 kg）。处理包括以755克/千克的玉米片为基的精加工日粮，其中真菌侵染的蒸汽片状玉米替代了0、150、300和450克/千克的对照片状玉米。对照片状玉米的酵母和霉菌计数分别平均为2.9x10 2 和1.2x10 4 CFU / g，而7.0x10 5 ，和真菌侵染的片状玉米分别为6.2x10 6 CFU / g。对瘤胃pH或挥发性脂肪酸的摩尔比没有治疗作用（P> 0.10）。日粮中真菌侵染的片状玉米水平升高，对有机质的瘤胃消化率（OM;线性成分，P <0.10）和饲料N（线性成分，P <0.05）降低。对净微生物氮的合成没有治疗作用（P> 0.10）。随着真菌侵害的薄片玉米的增加，氨基酸的摄入量线性增加（P <0.01），进入十二指肠的氨基酸流量增加（P <0.01）。随着SFM的增加，总消化的OM，N和能量减少（线性成分，P <0.05）。处理对ADF和淀粉的瘤胃和全道消化没有影响（P> 0.10）。可以得出结论，霉菌侵害会降低蒸玉米片的摄食价值。其结果与真菌生长对消化特性的影响无关，而是与腐败过程中易消化的营养物质（淀粉）的流失有关，而氮的消化率则有所下降。另一方面，真菌侵染的片状玉米的代谢蛋白值更高。

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