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Table 3.

Effect of carotenoid and melatonin supplementation on bill colour score

Sources of variationd.f.ϰ2P
Carotenois supplementation 19.92 <0.0001 
Melatonin supplementation 4.87 0.0273 
Carotenoid + melatonin supplementation 0.36 0.5501 
Sources of variationd.f.ϰ2P
Carotenois supplementation 19.92 <0.0001 
Melatonin supplementation 4.87 0.0273 
Carotenoid + melatonin supplementation 0.36 0.5501 

Differences in bill colour scores (post-experimental minus pre-experimental scores) were analysed using an ordinal model for multinomial data with a cumulative logit link function [PROC GENMOD (SAS Institute, 2001)].

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