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Layer 3 (Bone biology (Skeleton development (出雏0-6周先发育: GIT, immune and…
Layer 3
Bone biology
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Feed consumption
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Only 1 peak diet for 110–115g/d intake (brown) & 100–105g/d (white).∴FI start lay=80–90g/d=20–25% deficiency of Ca, P, AA
Solution=3 peak feeds (FI 90; 100; 110 g/d) then lay diet 2#, 3#, 4#
Skeleton development
出雏0-6周先发育: GIT, immune and skin and feathers（体温）
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12 wk age = skeleton 95% devlp, but only 75% mature BW
12-18 wk BW+= muscle, medullary bone&reproductive tract dev.
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3 types of bone: cortical, trabecular and medullary
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Diseases
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↓oviduct= infectious bronchitis, ND, Mycoplasma synoviae, egg drop syndrome (EDS) and avian influenza
Feed particle
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Influences
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++ fine particles →-gizzard, +proventriculus &-intestine length
Vaccination
Gumboro: drinking water, 15–18, 21–25, 28–32d
Use Newcastle-bronchitis combination vaccines; 2-3 live vaccination, drinking water or spray
Marek is vaccinated in hatchery, subcutaneous
AE-Fowl pox combination vaccination, wing web inoculation
Must: Marek’s , Newcastle (NDV), infectious
bronchitis (IB), infectious bursal (IBD or Gumboro), avian encephalomyelitis (AE, 禽脑脊髓炎) and fowl pox
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Molting (65 or 75 wk)
Improve laying %, shell quality, and albumen height
But egg size remains
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