“…However, studies have shown that the addition of 2–6% rapeseed oil to the diet of laying hens reduces egg production, egg weight, feed intake, and the feed-to-egg ratio [ 12 , 82 , 150 ]. In general, the addition of 2–6% rapeseed oil to the diet of laying hens exerts a limited effect on conventional parameters of egg quality, such as albumen weight, egg yolk weight, albumen height and, therefore, HU [ 12 , 13 , 83 , 84 , 150 , 153 ]. The addition of rapeseed oil might increase the lipid content and composition of the egg yolk and increase the contents of oleic acid, linolenic acid, DHA, and total n − 3 PUFAs in eggs, but it does not significantly change the cholesterol content [ 11 , 13 , 150 ].…”