POPM 4230 Lecture Notes - Lecture 3: Powdered Eggs, Free Range, Handmark

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9 d a t a i z e g. Layer flocks housing: conventional cages (~battery cages) 4-8 tiers high, 5-7 birds/cage, manure belts: furnished (enriched or enrichable) cages. 4 tiers high, 30-80 birds/cage, manure belts. ~ higher space allowance ~ perches, scratch areas, no litter area but plastic mat to forage and dust bath in: non-cages (free-run, aviaries, free-range) Free-run barn is similar to a breeder barn. *free range = free run but also has access to outdoors. Canadian agri-food research council space requirements for adult laying hens. Conventional cages white birds 432 cm2 (67in2), brown birds 483 cm2 (75 in2) Free run white birds 1700cm2 (264 in2) (all litter) or 850 cm2 (132 in2) (all wire/slats) Brown birds 1900 cm2 (295 in2) (all litter) 950 cm2 (147 in2) (all wire/slats) Calcium and vitamin d supplementation is critical to prevent cage layer fatigue (osteopenia) ~ white birds tend to be smaller = less space requirements.

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