Difference between revisions of "Skin Nutritional - Pathology"

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Revision as of 12:35, 29 October 2008


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()Map INTEGUMENTARY SYSTEM (Map)



General

  • Often combined deficiency which improves when animal is fed a balnced diet
  • Sometimes caused by change in demand (pregnancy, growth, cold weather) or due to disease

Zinc deficiency

  • Mainly in dogs and pigs, sometimes ruminants
  • In pigs:
    • Grossly:circumscribed reddened papules and plaques, thick crusting and scaling, fissures along ventral abdomen and medial thighs, sometimes generalised
    • Microscopically: parakeratosis, acantosis, pseudoepitheliomatous hyperplasia, hypergranulosis
    • Commonly secondary bacterial dermatitis
  • In dogs:
    • Siberian huskies and Alaskan malamutes:
      • Grossly: scales and crusts around mouthm chin, eyes, joints, prepuse, scrotum, vulva
      • Microscopically: diffuse hyperkeratosis extending to follicles, superficial perivascular dermatitis with eosinophils
    • Rapidly growing puppies:
      • Grossly: scaly plaques on skin, nasal planum and foot pads
  • In ruminants:
    • Grossly: alopecia, crusts and scales on face, neck and distal extremities and mucocutaneous junctions
    • Microscopically: parakeratosis, sometimes hyperkeratosis


Copper deficiency

  • Hair or wool depigmentation
    • Black sheep develop bands of lighter colouring
    • Cattle develop spectacle pattern of depigmentation around eyes)
    • Coat colour may change from black to reddish brown

Vitamin A deficiency

  • In dogs
  • Grossly: generalised scaling
  • Microscopically: marked follicular hyperkeratosis

Vitamin E deficiency

  • Steatitis may develop in cats fed excess fatty acids or with vitamin E deficincy
  • Grossly: firm, yellow or orange nodules in subcutaneous tissue
  • Microscopically: nodular to diffuse granulomatous panniculitis, macrophages and giant cells, oedema, fat necrosis, neutrophils and ceroid pigment