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Table 3 Comparison of slope genetic variance and reaction norm models for analysis of average daily gain (ADG, g) and treatment rate (TRT) in the challenge nursery (cNur), finisher (Fin) and across the nursery and finisher (All) for six challenge loads based on clinical disease traits or growth rate

From: Genetic analysis of disease resilience of wean-to-finish pigs under a natural disease challenge model using reaction norms

Trait CL using clinical disease traits CL using growth rate P-value vs. no RN
NurCLc FinCLc CLc NurCLg FinCLg CLg
Linear RN  
 cNurADG 400 (500) 500 (300) 500 (300) 0 2200 (400) 2000 (4000)  < 0.0001
 FinADG 1100 (600) 200 (300) 1200 (500) 200 (400) 0 0 0.004
 cNurTRT NA 0.01 (0.02) 0.10 (0.04) 0 0.07 (0.03) 0.09 (0.03) 0.03
 AllTRT 0 0 0.21 (0.05) 0.016 (0.03) 0 0.11 (0.04) 0.001
Trait CL using clinical disease traits CL using growth rate P-value vs. linear RN
  NurCLc FinCLc CLc NurCLg FinCLg CLg  
Cubic RN  
 cNurADG 400 (500) 240 (300) 600 (300) 160 (300) 2500 (600) 2000 (500) 0.35
 FinADG 1200 (700) 200 (200) 1600 (500) 500 (400) 0 0 0.001
 cNurTRT 0.24 (0.05) NA 0.08 (0.04) 0 0.07 (0.03) 0.09 (0.03) 0.04
 AllTRT 0 0 0.27 (0.06) 0.015 (0.03) 0 0.11 (0.04) 0.0003
  1. Only one corresponding CL was fitted as fixed effect in the linear and cubic spline reaction norm model. CL: challenge load; RN: reaction norm; NurCLc: challenge load derived from the clinical disease traits in the challenge nursery; FinCLc: challenge load derived from the clinical disease traits in early finisher; CLc: weighted challenge load of NurCLc and FinCLc; NurCLg: challenge load derived from the growth rate in the challenge nursery; FinCLg: challenge load derived from the growth rate in early finisher; CLg: weighted challenge load of NurCLg and FinCLg; P-value for cNurADG was based on FinCLg and P-values for FinADG, cNurTRT, and AllTRT were based on CLc because CLc was the best CL for these three traits. P-values for the linear model were based on comparison of the linear reaction norm model with the standard model without random slope term. P-values for the cubic spline model were based on comparison of the cubic spline reaction norm model with the linear reaction norm model. cNurADG: growth rate in the challenge nursery; FinADG: growth rate in the finisher; cNurTRT: medical treatment rate in the challenge nursery; AllTRT: medical treatment rate across the challenge nursery and finisher; figures in italic characters indicate the greatest genetic slope variance for that trait