02177naa a2200301 a 450000100080000000500110000800800410001902400440006010000250010424501460012926000090027552012550028465000290153965000200156865000180158865000140160665000140162065300190163465300120165365300180166565300210168370000240170470000220172870000200175070000260177070000190179677300600181510222682020-08-20       2021    bl uuuu     u00u1 u    #d7 a10.4025/actascianimsci.v43i1.502412DOI1 aFIGUEIREDO, M. R. P.  aDigestibility of diets with passion fruit by-product estimated through external and internal markers in dairy heifers.h[electronic resource]  c2021  aThis study examined the influence of the external markers chromium oxide (CO), titanium dioxide (TD), isolated, purified and enriched lignin (LIPE®) and isolated, purified, enriched lignin in nanoparticles (NANOLIPE®) as well as the internal markers indigestible dry matter (iDM), indigestible neutral detergent fiber (iNDF) and indigestible acid detergent fiber (iADF) in diets with inclusion of passion fruit by-product for dairy heifers on the estimation of fecal output and nutrient digestibility. Sixteen Holstein × Zebu crossbred heifers at an average live weight of 363 ± 28 kg were randomly distributed in a completely randomized design where they received diets in which Tifton 85 (Cynodon sp.) hay was replaced with passion fruit by-product (0, 12, 24 and 36%, as-fed basis). The CO, LIPE®, NANOLIPE® and iNDF markers did not differ from the total collection method (p > 0.05) in the estimation of fecal output and nutrient digestibility. The TD and iDM markers overestimated, while iADF underestimated fecal output. Under the presented conditions, we recommend using the CO, LIPE®, NANOLIPE® and iNDF markers to estimate fecal output and nutrient digestibility in diets with inclusion of passion fruit by-product for dairy heifers.  aAbsorção de Nutrientes  aDigestibilidade  aGado Leiteiro  aMaracujá  aPecuária  aFecal recovery  aIn situ  aPassion fruit  aTotal collection1 aSALIBA, E. de O. S.1 aBARBOSA, G. S. C.1 aCOLODO,J. C. N.1 aALMANÇA, R. A. de O.1 aMOREIRA, G. R.  tActa Scientiarum. Animal Sciencesgv. 43, e50241, 2021.