Abstract
Two samples of 170 laying hens (R.I.R. and W.P.R.) were subjected to two kinds of nest sets which visually differed in the chromaticity. The set designated as “coloured” contained randomly ordered individual nests of five colour alternatives. The set designated as “plain” consisted of the common galvanized nests.The total egg production and the frequency of nest eggs favoured the coloured nests. The relative difference between these two kinds of nests was most pronounced during the first week of observation. The periodical exchange of these nests did not show any significant systematical trend. Positional variability of nest eggs was significantly affected by colouring. This variability did interact with the two levels of the nests in the set.
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