IVTDIn Vitro True Digestibility
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The survival rate in the ICN, IVTN, and IVTD groups were 90%, but it was 60% in the ICD group.
IVTD = {(DM of feed taken for incubation - NDF residue) x100}/DM of feed taken for incubation
The environmental effects of year and location, and the interactions between year and location accounted for the major portion of variation among the cultivars for the four nutritive value traits (Table 4.) No relationship between cultivar-release date and CP, IVTD, NDF, or NDFD was demonstrated by regression analyses.
Greater IVTD was obtained in booting stage ryegrass than in the other two more advanced harvest stages in both pre-and post- storage samples (p<0.01).
Nutritive value, with the exception of IVTD and NDFD did not differ (P > 0.05) among species.
A similar set of syringes was run separately for estimation of IVTD. Total gas and methane were estimated at 0, 4, 8, 12 and 24 h post inoculation.
Calibration samples were also analyzed for IVTD using the ANKOM protocol (Ankom Technology, Fairport, NY) as described by Claessens et al.
Both hays from the more preferred first harvest were lower in NDF, ADF, hemicellulose, lignin, and ADIA and higher in IVTD than the less preferred harvest.
Correlation analysis was conducted to study the relationships among IVTD, IVNDFD, fiber components and their ratios, and plant biomass, using population mean values within years and the correlation matrix method (SAS Institute, 1996, Cary, NC).
Abbreviations: CP, crude protein; dNDF, digestible neutral detergent fiber: IVTD, in vitro true digestibility; LSR, leaf-to-stem mass ratio: NDF, neutral detergent fiber: SLA, specific leaf area.
Twenty superior [S.sub.2] families were selected on the basis of a heritability-based selection index consisting of total whole-plant yield, NDF, IVTD, NDFD, and CP.