01819naa a2200241 a 450000100080000000500110000800800410001902400440006010000200010424501080012426000090023252010780024165000140131965300080133365300310134165300230137270000200139570000180141570000230143370000140145670000270147077300800149720267222023-03-20       2015    bl uuuu     u00u1 u    #d7 a10.4025/actascianimsci.v37i3.249802DOI1 aKUWAHARA, F. A.  aEstimates of in situ digestibility and fibrous compounds in feeds for ruminants.h[electronic resource]  c2015  aCurrent paper assesses the relationship between in situ incubation time, particle size and types of materials on estimates of indigestible fractions of dry matter (iDM) and neutral detergent fiber (iNDF) in cattle feed and feces. Samples of soybean meal, alfalfa and feces of cattle fed on high concentrated diets were analyzed. The samples were processed in a Wiley mill, with 0.5 and 1.5 mm porosity for food and 1.5 mm for feces, which were packed in 4 × 5 cm F57 bags (Ankon ® ) and nonwoven fabric (100 g m -2) of two brands. The material was divided into two groups, with and without treatment with acetone, and five replications. Samples of each group were incubated in the rumen of a multiparous cow adapted to a 70:30 diet, forage:concentrate diet, for 240 hours. The iDM and iNDF levels were evaluated sequentially to interpret the percentages of undigested material. Data underwent analysis of variance (ANOVA, p &lt 0.05) and means were compared by Tukey?s test (p &lt 0.05). Material, size of particles and incubated material affected iDM and iNDF estimates.  aDigestão  aF57  aFibra em detergente neutro  aTecido não tecido1 aSOUZA, G. B. de1 aSOARES, V. F.1 aFERREIRA, R. de P.1 aCOSTA, C.1 aMEIRELLES, P. R. de L.  tActa Scientiarum. Animal Sciencesgv. 37, n. 3, p. 259-264, jul./sep. 2015.