51. Rearing houses are relatively barren. They provide for the birds' basic environmental comfort and nutritional needs but offer little in the way of additional novel stimuli. Even the feeders and drinkers may be raised for part of the day in some systems. We discuss access to feed and water later but this section is concerned with stimulation provided for the birds.
52. To create enrichment, it is good practice to offer insoluble grit (spread on the litter) from about 6 weeks of age. This will also help to enable the gizzard to break down any litter or feathers that may have been consumed and encourage scratching and foraging behaviour which has the added advantage of improving litter quality. Perches in the rearing house may provide a form of enrichment to aid the birds in performing another of their natural behaviours. Perches will also aid the birds' adaptation from litter to raised, perforated floors when they move to the laying house.
53. Environmental enrichment, such as the provision of perches and the scattering of grit on the litter, should be available in rearing houses.
54. Studies should be undertaken to ascertain the materials and means which most effectively enrich the environment for broiler breeders.