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  • Title: Comparison of four digestibility markers to estimate fecal output of dogs.
    Author: Alvarenga IC, Aldrich CG, Ou Z.
    Journal: J Anim Sci; 2019 Mar 01; 97(3):1036-1041. PubMed ID: 30753619.
    Abstract:
    Twelve adult beagle dogs (10.6 ± 1.4 kg) were fed extruded dog diets in which the starch sources were whole sorghum, sorghum flour, sorghum mill-feed, or an equal combination of rice, corn, and wheat. The experiment was conducted as a replicated Latin square design digestibility study. Estimates of fecal organic matter (OM), crude protein (CP), crude fat (CF), and gross energy (GE) outputs were determined by four methods: total fecal collection (TFC), chromic oxide (Cr2O3), titanium dioxide (TiO2), and acid insoluble ash (AIA). The correlation among the fecal output estimates by the four methods by partial correlation coefficients from the Error SSCP Matrix (Pearson) were considered significant at P < 0.05. The external markers, Cr2O3 and TiO2, had a higher (P < 0.05) OM fecal output Pearson correlation to TFC than the intrinsic marker AIA (R = 0.931 for Cr2O3 vs. TiO2; R = 0.559 for TFC vs. Cr2O3; R = 0.592 for TFC vs. TiO2; R = 0.291 for AIA vs. TFC). Interestingly, TiO2 highly correlated (P < 0.05) to Cr2O3 (R = 0.93 for OM), and was also correlated highly to TFC and AIA. The study suggests that TiO2 may be a preferred marker to estimate fecal output in dogs vs. Cr2O3. The use of AIA represents a potential option for determining digestibility for diets in which external markers are impractical.
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