TABLE 3

Differences in mucosal permeability and response to luminal glucose addition in distal jejunum of low- and high-RFI broiler chickens fed either ad libitum or restrictivelya

ParameterValuebSEMP value
Ad libitum feedingRestrictive feeding
Low RFIHigh RFILow RFIHigh RFIFLRFIFL × RFI
Avg electrophysiological variables
Isc (µA/cm2)2.98−0.29−0.83−0.971.0290.0360.1070.137
RT (W/cm2)0.660.580.690.600.0340.4950.0220.912
FITC (nmol/cm2 × h)0.00410.00550.00450.00320.00110.4000.9750.259
HRP (pmol/cm2 × h)0.00940.00140.00190.00560.00380.6540.5770.130
Glucose responsec
Basal Isc (µA/cm2)6.535.664.744.430.8170.0730.4800.733
ΔIsc2.163.112.492.550.5590.8410.3720.431
Basal RT (W/cm2)0.580.540.590.570.0310.6280.2700.837
ΔRT3.65b7.31a5.12b4.33b1.0480.4750.1800.041
  • a Data are presented as least-squares means and pooled SEM. n =7 per FL group, RFI rank, and sex except for n =8 high-residual-feed-intake (RFI) ad libitum females. RFI was calculated for the experimental period from 9 to 30 days posthatch. FL, feed intake level; FITC, fluorescein 5(6)-isothiocyanate; HRP, horseradish peroxidase.

  • b Different letters within a row indicate significant differences (P 0.05).

  • c Data represent responses to glucose addition to reach a final chamber concentration of 5 mmol/liter. ΔIsc, difference between the maximal Isc value obtained 2 min after glucose addition and the basal value determined 1 min before glucose addition; ΔRT, difference between the basal glucose transport (GT) value determined 1 min before glucose addition and the RT value obtained 2 min after glucose addition.