<b>Comparison of indigestible markers from <i>in situ</i> and <i>in vivo</i> incubation to predict apparent digestibility in hay- and corn-fed horses</b> - 10.4025/actascianimsci.v34i1.10572
2011
Janaina Carolina de Sá | Vinícius Antonio Baptista Oliveira | Ciniro Costa | Carla Maris Machado Bittar | Kátia de Oliveira
Four castrated crossbred horses were used in a randomized block design to study the use of indigestible internal markers iNDF and iADF obtained <i>in situ</i>(from bovines) or <i>in vivo</i> (from equines). Treatments consisted of determining digestibility by the direct method comprising total feces collection (TC) and by the indirect method comprising internal markers iNDF and iADF obtained by <i>in situ</i>incubation in bovine rumen or <i>in vivo</i> by the mobile nylon bag (MNB) technique with horses. iNDF-IV and iADF-IV resulted in better marker recovery rate (RR) (91.50%), similar to TC. The <i>in situ</i> technique resulted in lower RR values for the two indigestible markers, averaging 86.50% (p < 0.05). Estimates of the nutrient coefficient of digestibility (CD) were adequately predicted by iADF-IV, for horses fed on hay exclusively, with rates 46.41, 48.16, 47.92 and 45.51% for dry matter (DM), organic matter (OM), FDN and gross energy, respectively. Results show that MNB may be used to obtain iADF in horses fed on coast-cross hay exclusively, whereas NDFi and ADFi were selected for horses fed on mixed diets to predict the coefficient of nutrient digestibility
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