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- W2910363884 abstract "The capybara ( Hydrochoerus hydrochaeris ), the largest living rodent, probably has a “mucus‐trap” colonic separation mechanism. To test this hypothesis, we measured the mean retention time of a solute marker (MRT Solute ), 2 mm (MRT 2 mm ), 10 mm (MRT 10 mm ), and 20 mm (MRT 20 mm ) particle markers and nutrient digestibility in adult captive capybaras (27–52 kg body mass (BM), 2–11 yr). In addition, total gut fill and the selectivity factor (MRT Solute /MRT 2 mm ) were calculated, and mean faecal particle size and metabolic fecal nitrogen of captive capybaras were compared to those of free‐ranging specimens. Finally, we also measured methane production in one animal. The MRT 2 mm (29.2 ± 8.2 hr) was different ( p < 0.01) from MRT Solute (37.0 ± 13.1 hr), MRT 10 mm (36.5 ± 8.2 hr), and MRT 20 mm (35.1 ± 9.6 hr). The selectivity factor (1.26 ± 0.30) was in the range considered typical for a “mucus‐trap” colonic separation mechanism. The estimated total gut fill was 1.50 ± 0.37% and 1.73 ± 0.25% of BM calculated from the results of the 2‐mm and 10‐mm particle markers, respectively. The CH 4 emission was 13.7 L/day. Captive capybaras had greater mean fecal particle size (0.44 ± 0.06 vs. 0.29 ± 0.05 mm, p < 0.001) and metabolic fecal nitrogen (65.5 ± 3.91 vs. 46.8 ± 10.5% of fecal nitrogen, p < 0.001) than free‐ranging capybaras. Organic matter digestibility decreased less steeply with increasing dietary crude fiber content in capybaras as compared to published data from rabbits or guinea pigs. Accordingly, the digestive physiology of the capybara is characterized by a comparatively high fiber digestibility, with a “mucus‐trap” colonic separation mechanism, allowing capybaras to thrive on forage‐only diets." @default.
- W2910363884 created "2019-01-25" @default.
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- W2910363884 date "2019-01-09" @default.
- W2910363884 modified "2023-09-27" @default.
- W2910363884 title "Digestive physiology of captive capybara ( <i>Hydrochoerus hydrochaeris</i> )" @default.
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- W2910363884 doi "https://doi.org/10.1002/zoo.21472" @default.
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