Causes of carcass condemnation in Norwegian aviary housed layers

Table 4 The effect of season on dead on arrival (DOA) and total carcass condemnation

Outcome	Variables	Prevalence ratio	SE	p-value
DOA	Seasons
	Winter	Baseline
	Spring	0.696	0.118	0.032
	Summer	0.873	0.172	0.491
	Autumn	0.847	0.183	0.442
	Random effect variances
	Farm	0.105	0.069
Total carcass condemnation	Seasons
	Winter	Baseline
	Spring	0.862	0.079	0.103
	Summer	0.971	0.105	0.782
	Autumn	0.792	0.093	0.046
	Random effect variances
	Farm	0.045	0.021

Mixed effect negative binomial regression models were used to assess the effect of season on DOA and total carcass condemnation. Both models included farm as random effect. Unit of analysis is based on delivered batch level. Study sample consisted of 98 batches and 53 farms

ISSN: 1751-0147