INDFIndigestible Neutral Detergent Fiber
INDFIraqi National Dialogue Front
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For iNDF determination, the samples (food and faeces) were milled through a 2-mm sieve, packed (20 mg of DM [cm.sup.-2) in 4 x 5 cm Ankon[R] previously weighed filter bags (NOCEK, 1988) and incubated for 240 hours in the rumen of a crossbred cow (DETMANN et al., 2001) fed a mixed diet of equal parts forage (corn silage) and concentrate (the same concentrate used in the treatments).
Dry matter intake (DMI) was estimated by using the iNDF as an internal marker and calculated by the following equation:
In which: IIpDM = individual intake of pasture dry matter (kg/d); FE = feces excretion (kg/d); iFC = iNDF feces concentration (kg/kg); iS = iNDF intake from the supplement (kg/d) and iFoC = iNDF forage concentration (kg/kg).
The iNDF content was evaluated by F57 (Ankom[R]) bags incubated in rumen by 288 (VALENTE et al., 2011).
After incubation, the residue was subjected to neutral detergent fiber (NDF) analysis to determine INDF. Estimated pasture DMI was determined from the fecal production estimate and extrusa DM.
This study evaluated the chromium complexed with ethylenediaminetetraacetic acid (Cr-EDTA), ytterbium chloride (Yb[Cl.sub.3]) and indigestible neutral detergent fiber (iNDF) in the estimation of fecal production; and analyzed the duodenal flow of dry matter, through the methods of single and double indicators and total, ruminal and post-ruminal apparent digestibility coefficients of different nutrients in dairy heifers in the post-weaning period.
The iDM and iNDF intakes (kg/d), however, were negatively and linearly associated with the CaO doses added to the sugar cane.
The internal markers that are commonly used in digestion trials for obtaining estimations of the fecal dry matter recovery and, subsequently, of digestibility, are the indigestible dry matter (iDM), indigestible neutral detergent fiber (iNDF) and indigestible acid detergent fiber (iADF) (Penning and Johnson, 1983; Van Soest, 1994; Detmann et al., 2001; Detmann et al., 2007b).
Highest INDF presented by animals which were fed on forager sorghum silage IPA SF-25 may have restricted their DMI due to the NDF rate of the variety, coupled to the diet's low NFC.
Among the intake internal markers, the insoluble and indigestible fibrous fraction of food, specifically indigestible neutral detergent fiber (iNDF) has been widely employed as an internal index due to its greater precision (Piaggio et al., 1991; Zeoula et al., 2000).