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Table 3 Non-linear model parameters between the independent response variables (protein deposition, average daily gain, and gain:feed ratio) and the threonine:lysine ratio in an individual precision-feeding (IPF) system and a group phase-feeding (GPF) system estimated with a linear-plateau model and a quadratic-plateau model

From: Pigs receiving daily tailored diets using precision-feeding techniques have different threonine requirements than pigs fed in conventional phase-feeding systems

Feeding system Responseb Model parametera
U SEe R SEe L SEe P-value RSE
Linear-plateau model
 IPF PD −0.873 0.25 85.4 6.91 159.5 0.00 24.33
ADG 0.00505 0.002 82.2 11.37 0.8295 0.04 0.00 0.12
G:F
 GPF PD −1.2239 0.99 60.2 9.89 149.5 3.76 0.07 21.61
ADG −0.00376 0.001 64.9 24.01 0.77 0.02 0.24 0.12
G:F −0.0056 0.003 68.6 6.45 0.5362 0.01 0.03 0.08
Quadratic-plaateau model c
 GPF PD −0.0347 0.059 68.2 19.82 149.5 4.28 0.07 21.61
ADG −0.00011 0.0003 71.1 28.51 0.7698 0.03 0.25 0.12
G:F −0.00012 0.0002 70.6 17.33 0.5387 0.02 0.03 0.08
  1. aU, fit intercept; SEe, standard error of the estimation; R, parameter corresponding to the standardized ileal digestible threonine:lysine ratio required to reach the plateau; L, average response estimated by the model; RSE, residual standard error
  2. bPD, protein deposition (g/d); ADG, average daily gain (kg/d); G:F, gain:feed ratio (kg/kg); cModel not converged for IPF