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首页> 外文OA文献 >A case of non-scaling in mammalian physiology? Body size, digestive capacity, food intake, and ingesta passage in mammalian herbivores
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A case of non-scaling in mammalian physiology? Body size, digestive capacity, food intake, and ingesta passage in mammalian herbivores

机译：哺乳动物生理学无结垢的情况？哺乳动物食草动物的体型，消化能力，食物摄入和摄取途径

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As gut capacity is assumed to scale linearly to body mass (BM), and dry matter intake (DMI) to metabolic body weight (BM(0.75)), it has been proposed that ingesta mean retention time (MRT) should scale to BM(0.25) in herbivorous mammals. We test these assumptions with the most comprehensive literature data collations (n=74 species for gut capacity, n=93 species for DMI and MRT) to date. For MRT, only data from studies was used during which DMI was also recorded. Gut capacity scaled to BM(1.06). In spite of large differences in feeding regimes, absolute DMI (kg/d) scaled to BM(0.76) across all species tested. Regardless of this allometry inherent in the dataset, there was only a very low allometric scaling of MRT with BM(0.14) across all species. If species were divided according to the morphophysiological design of their digestive tract, there was non-significant scaling of MRT with BM(0.04) in colon fermenters, BM(0.08) in non-ruminant foregut fermenters, BM(0.06) in browsing and BM(0.04) in grazing ruminants. In contrast, MRT significantly scaled to BM(0.24) (CI 0.16-0.33) in the caecum fermenters. The results suggest that below a certain body size, long MRTs cannot be achieved even though coprophagy is performed; this supports the assumption of a potential body size limitation for herbivory on the lower end of the body size range. However, above a 500 g-threshold, there is no indication of a substantial general increase of MRT with BM. We therefore consider ingesta retention in mammalian herbivores an example of a biological, time-dependent variable that can, on an interspecific level, be dissociated from a supposed obligatory allometric scaling by the morphophysiological design of the digestive tract. We propose that very large body size does not automatically imply a digestive advantage, because long MRTs do not seem to be a characteristic of very large species only. A comparison of the relative DMI (g/kg(0.75)) with MRT indicates that, on an interspecific level, higher intakes are correlated to shorter MRTs in caecum, colon and non-ruminant foregut fermenters; in contrast, no significant correlation between relative DMI and MRT is evident in ruminants.
机译：由于假设肠道容量与体重（BM）呈线性比例关系，而干物质摄入（DMI）与代谢体重（BM（0.75））呈线性比例关系，因此建议摄入的平均保留时间（MRT）应与BM（0.75）比例关系。 0.25）在草食性哺乳动物中。迄今为止，我们使用最全面的文献数据对照（肠道容量为n = 74种，DMI和MRT为n = 93种）来检验这些假设。对于MRT，仅使用研究数据并记录DMI。肠道容量定为BM（1.06）。尽管饲养方式差异很大，但所有受测物种的绝对DMI（kg / d）仍为BM（0.76）。无论数据集中固有的这种异速测量法如何，在所有物种中只有BM（0.14）的MRT仅极低的异速测量法缩放比例。如果根据消化道的形态生理学设计对物种进行分类，则结肠发酵罐中的BM（0.04），非反刍前肠发酵罐中的BM（0.08），浏览中的BM（0.06）和BM（0.06）的MRT缩放比例均不显着。 （0.04）在放牧反刍动物中。相反，在盲肠发酵罐中，MRT显着扩展至BM（0.24）（CI 0.16-0.33）。结果表明，在一定的体型以下，即使进行了共同预防，也无法实现长时间的MRT。这支持了在体型范围的下限限制食草动物的潜在体型限制的假设。但是，超过500 g阈值时，没有迹象表明BM的MRT会大体上普遍增加。因此，我们将摄食物保留在哺乳动物的草食动物中是一个生物学的，与时间有关的变量的例子，该变量在种间水平上可以通过消化道的形态生理学设计与假设的强制异变比例分离。我们建议，很大的体型并不能自动暗示具有消化优势，因为长的MRT似乎并不只是很大的物种的特征。相对DMI（g / kg（0.75））与MRT的比较表明，在种间水平上，盲肠，结肠和非反刍的前肠发酵罐中较高的摄入量与较短的MRT相关。相反，反刍动物中相对DMI与MRT之间没有明显的相关性。

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