The accuracy of the reference – calculations

Marjatta Oksama  

Results from dissection trials carried out in Sweden, Spain, Belgium and Netherlands.

The model, we have used, is a variance component model, which allows dependence between observations on the same carcass. With this model we can explain all systematic differences between left and right side, slaughterhouses and fat classes.

Model:

a » Country i = 1-4                             fixed

J » Fatgroup j = 1-3                            fixed

g » Abattoir k = 1-8                             fixed

V » Sex l = 1-3                                     fixed

x » Side m = 1,2                                 fixed

B » Butcher n = 1-8             random

C » Carcass o = 1-32          random

e » error                               random

All random effects are assumed to be normally distributed with mean 0 and variance s².

Definitions:

Repeatability standard deviation s_r

Reproducibility standard deviation  s_R

Reliability  =  

Dissection lean meat percent: estimated butcher- and carcassvariation, repeatability, reproducibility and reliability.