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Table 2 Assumptions of the different models

From: Heterogeneity of variance components for preweaning growth in Romane sheep due to the number of lambs reared

   Direct
genetic
Maternal
genetic
Maternal
permanent
Litter Residual
  α 2 σ d 1 2 σ d 2 2 ρ d 1 d 2 σ m 1 2 σ m 2 2 ρ m 1 m 2 σ p 1 2 σ p 2 2 ρ p 1 p 2 σ l 1 2 σ l 2 2 σ e 1 2 σ e 2 2
Mod(7) = 1  
Mod(6) = 1 = 1  
Mod(5) = 1 = 1  
Mod(4) = 1 = 1 = 1  
Mod(3) = 1 = 1 = 1 = 1  
Mod(2) = 1 = 1 = 1
Mod(1) = 1 = 1 = 1 = 1
Mod(Coef) = 0.7 = 1 = 1 = 1
  1. in two cells indicates that the two components are equal; = × indicates that the component is fixed to x. for litter size i; σ e i 2 is the residual variance; σ d i 2 and ρ d 1 d 2 are the direct genetic variance and correlation; σ m i 2 and ρ m 1 m 2 are the maternal genetic variance and correlation; σ p i 2 and ρ p 1 p 2 are the maternal permanent variance and correlation; σ l i 2 is the litter variance