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• W2313141062 abstract "Retention times of a particulate marker (103Ru-P) and of a solute marker (51CrEDTA) were measured in the gastrointestinal tracts of three species of potoroine marsupials (small nocturnal macropodoids) who were fed grain-based diets containing variable concentrations of fiber. The observed distribution of retention times can be described by a general curve whose characteristics show a delay period, during which there is little or no excretion of marker, followed by a sharp rise to a peak concentration. After the peak, the curve falls exponentially. Thus, in the present experiments, while there was a difference of 8-10 h between the excretion of 5% and 50% of the markers, 30-50 h elapsed between the excretion of 50% and 95% and of 95% and 99%. The similarity of mean retention times (MRT) (25-30 h) of the two markers in the gastrointestinal tracts of potoroine marsupials contrasts with the marked separation of digesta phases in macropodids. The different patterns of digesta flow in the two groups were explained by differences in foregut anatomy. The lack of phase separation observed in this study tends to contrast also with radiographic studies in potoroine marsupials that indicated that large particles are retained longer than solutes in the foregut. However, similar overall MRTs may result from particle retention in the foregut and from solute retention in the hindgut. No significant differences were found between Aepyprymnus rufescens, Potorous tridactylus, or Bettongia penicillata for any parameter of digesta passage. Potoroines are strictly nocturnal (Bettongia and Aepyprymnus) or crepuscular (Potorous) and show a spate of feeding and excretion just after dark. Furthermore, digesta passage was not affected by the level of dietary plants' cell wall constituents or by the level of gut fill when the markers were administered. Because MRTs in all three species were often between 24 h and 30 h, it seems probable that digesta flow in potoroines is regulated to comply with their circadian rhythm." @default.
• W2313141062 created "2016-06-24" @default.
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• W2313141062 date "1994-05-01" @default.
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• W2313141062 title "The Rate of Passage of Digesta through the Gastrointestinal Tracts of Potoroine Marsupials: More Evidence about the Role of the Potoroine Foregut" @default.
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• W2313141062 doi "https://doi.org/10.1086/physzool.67.3.30163770" @default.
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