DIGESTIVE FERMENTATION IN HERBIVORES - EFFECT OF FOOD PARTICLE-SIZE
DIGESTIVE FERMENTATION IN HERBIVORES - EFFECT OF FOOD PARTICLE-SIZE
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DOI：
10.1086/physzool.63.4.30158172
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发表时间：
1990-07-01
期刊：
影响因子：
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通讯作者：
MOORE, JE
中科院分区：
文献类型：
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作者：
BJORNDAL, KA;BOLTEN, AB;MOORE, JE
我们研究了食物颗粒大小的减少对反刍动物干物质和细胞壁发酵的速度和程度的影响，使用体外和甘蔗技术。大颗粒的消化速率明显较低，微生物对大颗粒细胞壁的降解时间也明显较长。即使在144小时后，大颗粒的消化程度也低于小颗粒。这些结果对食草动物的消化过程具有重要意义，例如爬行动物，它们只能最小限度地减少食物颗粒的大小。在这些食草动物中，比如爬行动物，这只能最小限度地减少食物的颗粒大小。在这些食草动物中，消化物必须保留更长的时间，以达到与食草动物相似的消化效率，这些食草动物在更大程度上减少了食物颗粒的大小。停留时间的长短是暴露于微生物攻击的表面面积的函数，而不是总表面面积。微生物活动集中在没有角质层保护的区域。由于植物结构的复杂性，不同颗粒大小的相对发酵速率不能仅从相对颗粒大小来预测。
We examined the effect of reduction in food particle size on the rate and extent of fermentation of dry matter and cell walls in ruminants using in vitro and in sacco techniques. Large particles were digested at significantly lower rates, and time to initiation of cell wall degradation by microbes was significantly longer for large particles. Even after 144 h, large particles were digested to a lesser extent than were small particles. These results have important implications for digestive processing in herbivores, such as reptiles, that only minimally reduce food particle size. In these herbivores, such as reptiles, that only minimally reduced food particle size. In these herbivores, digesta must be retained for much longer periods of time to achieve digestive efficiencies similar to those of herbivores that reduce food particle size to a greater extent. Length of retention time is a function of the amount of surface area exposed to microbial attack, not total surface area. Microbial activity concentrates in areas not protected by the cuticle. Because of the complexity of plant structure, relative rates of fermentation of different particle sizes cannot be predicted from relative particle size alone.