Sex proportion as a covariate increases the statistical test power in growth performance based experiments using as-hatched broilers.

In addition to this, the fact that there was already a high model significance and observed power when ANOVA was performed, such as was the case in the grower period for experiments 1 and 3, where the treatment effects were highly significant, then the inclusion of male % as a covariate will result in very little improvements in model significance and increases in observed power.

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