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Archivos de Zootecnia

On-line version ISSN 1885-4494Print version ISSN 0004-0592


QUEIROZ, M.F.S. et al. Markers for estimate beef cattle digesta flow. Arch. zootec. [online]. 2011, vol.60, n.231, pp.571-582. ISSN 1885-4494.

The duodenal and omasal dry matter flows by single and double marker methods were compared in seven Nellore steers with average body weight 250 kg, and previously canullated in the rumen and duodenum. The animals were fitted with continuous-infusion pump that administered CoEDTA solutions intraruminally. In addition, a capsule containing Cr2O3, and other, containing external n-alkanes C32, C36 were inserted into the rumen of each steer. Internal markers indigestible neutral-detergent fiber and acid-detergent fiber (iNDF and iADF after 144 h in situ incubation) and internal n-alkanes C31, C33, C35 were components of the diet. Steers were fed with palisade grass (Brachiaria brizantha cv. marandu) in two age of regrowth, 30 and 60 days. The duodenal flow experimental design was a factorial 2x2x12 while omasal experimental design was a factorial 2x2x4. Markers iNDF, CoEDTA and the combination Co+iNDF were efficacious to estimate duodenal dry matter flow whereas iNDF, iADF and the Co+iADF combination were all efficacious to predict omasal dry matter flow. In Conclusion, the double marker method for estimation of omasal and duodenal dry matter flow was the most appropriate considering the ruminal fiber digestibility.

Keywords : Chromium; CoEDTA; Duodenal flow; iADF; iNDF; N-alkanes; Omasal flow.

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