When laying hens were only housed in conventional cages, the most notable differences between strains came down to feeding, feed efficiency and the colour of their eggs. As the popularity of eggs from non-cage systems increases, an understanding of genetic differences in behaviour, especially between white- and brown-feathered strains, are critical for successful management. In today’s more complex housing systems, an understanding of genetic differences in behaviour, especially between white- and brown- feathered strains, are critical for successful management. White and brown strains of hens differ in physical ability and motivation to use furnishings, in their fearful reactions and even response to stress. View Dr. Tina Widowski's presentation.