Avaliação de indicadores e metodologia de coleta para estimativa da digestibilidade de nutrientes em bubalinos

Abstract

Dry fecal matter production has been estimated from neutral detergent indicators on indigestible fiber (iNDF), acid detergent fiber (iADF), indigestible dry matter (DMi), that were incubated for 144 hours and 288 hours, as well as chromium oxide (Cr2O3) and purified isolated lignin and enriched (LIPE®) in two sampling schemes (3 and 5 days) on buffaloes. Five geldings animals were used with average weight of 300 kg and feed with Cameroon grass(Pennisetum purpureum Schumacher). The experimental design was completely randomized (splitplot). The production of fecal dry matter (PFDM) was overestimated using Cr2O3, iADF 144 h, iNDF 144 h, iNDF 288 h and MSi144, while the iADF 288 h, DMi 288 h and LIPE® do not differ from the total sampling. The same result was observed for dry matter digestibility (DMD). When comparing sampling periods (3 or 5 days) no differences were found to DMS and PFDM, which demonstrate that the sampling period of 3 dayscan be used to estimate the production of dry fecal matter. The use of LIPE®, iADF and DMi as indicators (the last incubated for 288 h on rumen) are more adequate for the dry fecal matter estimation, as the digestibility determination of nutrients using a three-day fecal sampling strategy.