Guinea pigs are assumed to practice caecotrophy to a higher degree than rats. Studies from leporids suggest that through the practice of caecotrophy, hindgut fermenting species could build up microbial fatty acids (FA) in body tissues. We hypothesized that microbial FA would be detectable in the body tissue of guinea pigs and rats, and this to a higher degree in guinea pigs. Twenty‐four rats and guinea pigs were fed with four different pelleted diets (lucerne‐, meat‐, meat‐bone‐, insect‐based) in groups of six animals for 8 weeks. Perirenal adipose tissue differed in FA composition between the species in spite of the common diets. FA typically associated with microbial activity (saturated FA (SFA; typically 18:0), monounsaturated FA (MUFA; typically trans‐fatty acids TFA), and odd‐ and branched‐chain FA (Iso‐FA)), were all detected. Guinea pigs had higher SFA levels than rats except on the lucerne diet. Concentrations of 18:0 were higher for guinea pigs on the meat and bone diet. Iso‐FA concentrations in guinea pigs exceeded those of rats on all diets. FA profiles with a microbial fingerprint appear—although in low proportions—in the body tissue of both species, and this seemingly to a higher extent in guinea pigs. With respect to whether consumption of rodent meat rich in microbial FA has particular effects on human health as shown for ruminant products, microbial FA concentrations are probably too low to cause any distinct effects.

中文翻译：

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饲喂各种饮食的大鼠（Rattus norvegicus domestica）和豚鼠（Cavia porcellus）的周脂肪中微生物来源的脂肪酸。

豚鼠被认为比大鼠具有更大程度的盲肠萎缩。对脂蛋白的研究表明，通过盲肠发酵，后肠发酵物种可以在人体组织中积累微生物脂肪酸（FA）。我们假设在豚鼠和大鼠的身体组织中可检测到微生物FA，而在豚鼠中这种微生物的检出率更高。以六只动物为一组，对二十四只大鼠和豚鼠喂食四种不同的颗粒饲料（以卢塞恩，肉，肉骨，昆虫为基础），持续8周。尽管有共同的饮食习惯，但种间脂肪组织的脂肪酸组成却不同。通常检测到与微生物活性有关的FA（饱和FA（SFA;通常18：0），单不饱和FA（MUFA;通常反式脂肪酸TFA）以及奇数和支链FA（Iso-FA））。豚鼠除使用卢塞恩饮食外，其SFA水平均高于大鼠。豚鼠的肉和骨饮食中18：0的浓度较高。在所有饮食中，豚鼠中的Iso-FA浓度都超过了大鼠。带有微生物指纹的FA谱在两种物种的身体组织中都出现了（尽管比例很低），在豚鼠中似乎更高。如反刍动物产品所示，食用富含微生物FA的啮齿动物肉是否对人类健康有特殊影响，微生物FA的浓度可能太低而不会引起任何明显的影响。带有微生物指纹的FA谱在两种物种的身体组织中都出现了（尽管比例很低），在豚鼠中似乎更高。如反刍动物产品所示，关于食用富含微生物FA的啮齿动物肉类是否对人体健康有特殊影响，微生物FA的浓度可能太低而无法引起任何明显的影响。带有微生物指纹的FA谱在两种物种的身体组织中都出现了（尽管比例很低），在豚鼠中似乎更高。如反刍动物产品所示，关于食用富含微生物FA的啮齿动物肉类是否对人体健康有特殊影响，微生物FA的浓度可能太低而无法引起任何明显的影响。