Fig. 3From: Age-related changes in the shell gland and duodenum in relation to shell quality and bone strength in commercial laying hen hybridsMucosal height in the duodenum of Lohmann Selected Leghorn (LSL) and Lohmann Brown (LB) hens at different ages during the production period. The height of mucosa in the duodenum was measured in five fields/section, measured from muscularis mucosa to top of the villi, and a mean was calculated for each birdBack to article page