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Vitamin A Deficiency, Nutritional Roup

Extracted From:
A Pocket Guide to
Poultry Health
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By Paul McMullin
© 2004
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Vitamin A deficiency is occasionally seen in chickens and turkeys (insufficient vitamin A during 1-7 weeks of age). As in the case of other nutritional deficiencies, classic signs of deficiency are very rare in commercial poultry fed complete diets.


  • Poor growth.
  • Poor feathering.
  • Nasal and ocular discharge.
  • Drowsiness.
  • Pale comb and wattles.
  • Eyelids stuck shut with thick exudate.

Post-mortem lesions

  • Eyelids inflamed and adhered.
  • Excessive urates in kidneys and ureters.
  • Pustules in mouth and pharynx.
  • Microscopically - squamous metaplasia of epithelia.


Signs, lesions, feed formulation. Differentiate from Infectious coryza, chronic fowl cholera, infectious sinusitis etc.


Vitamin A in drinking water.


Supplementation of diet with vitamin A, antioxidant, good quality raw materials.

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