Fig. 3From: Nest preference and laying duration traits to select against floor eggs in laying hensGenetic (\({\sigma }_{a}^{2}\)) and residual (\({\sigma }_{e}^{2}\)) variances of laying duration traits by line and 28-day period. MLD mean laying duration, MDB mean duration in the nest before laying, MDA mean duration in the nest after laying. Different letters indicate a significant difference between periodsBack to article page