Oxidative Breakdown of Carotenoids ...

Oxidative Breakdown of Carotenoids or Inadequate Pigment Ratios in Laying Hens

Oxidative Breakdown of Carotenoids or Inadequate Pigment Ratios in Laying Hens

Observed Clinical Signs Happenings

Internal Egg quality

  • Yolk Mottled, flaccid and fragile or Flecked Yolk (a very limited amount of mottling is normal)
  • Yolk colour Abnormal
  • Yolk colour variable
  • Pale yolks or yolk colour decreased or yolk discolouration

Diet or Feed Changes (Recent Feed delivery, Recent formulation /diet, Other silo or improper storage, another feed brand)

  • Ingredients which are potential oxidizing agents, such as minerals and certain fatty acids, has been shown to reduce pigmentation.
  • There are a number of dietary and management factors which can reduce the effective deposition of xanthophylls in the yolk.

 Oxidative Breakdown of Carotenoids or Inadequate Pigment Ratios in Laying show, exhibit, or manifest any of the following clinical signs happenings:

Observed Clinical Signs Happenings

ALWAYS

NEVER

SOMETIMES

Egg drop

 

  •  

 

Mortality above the standard

 

  •  

 

Visibly sick birds

 

  •  

 

Flock behaviour activity change

 

  •  

 

Decreased flock mobility or activity

 

  •  

 

Increase flock mobility or activity

 

  •  

 

Droppings abnormalities

 

  •  

 

Respiratory abnormalities

 

  •  

 

Neurological Nervous

 

  •  

 

Lameness or unusual movements, incoordination, reluctance to move

 

  •  

 

Eyes abnormalities

 

  •  

 

Head: Comb Wattles Face Nostrils Sinuses Mount Beak Earlobes (except eyes)

 

  •  

 

Body Parts (Neck, wings, breast, abdomen, shanks, legs, hocks, feet, joints, vent, and skin, abnormalities), skinny body, retarded growth, weight depression

 

  •  

 

Feathers abnormalities

 

  •  

 

Feed Consumption Changes

 

  •  

 

Diet or Feed Changes (Recent Feed delivery, Recent formulation /diet, Other silo or improper storage, another feed brand)

  • *

 

 

Shell quality

 

  •  

 

Internal Egg quality

  • *

 

 

* Sometimes has not been observed the relationship between any feed or diet changes and the observed clinical happenings in a flock or several other flocks or different farms

*Sometimes has not been observed or measured the internal egg quality changes yet or inadequacy of monitoring systems, and even the course time of the disease

 

Causing Agents
Oxidative breakdown of Carotenoids in Diet or Inadequate Pigment Ratios in Diet
Affected Systems/Organs
Internal Egg quality
Spread
N/A
Mainly Affects
Yolk Egg Quality, Yolk pigmentation
Solution
Inadequate xanthophylls source or storage. Adequate addition of antioxidant in the diet. Yolk colour seems to be enhanced when high levels of vitamin E are used, and when the diet contains antioxidant. Xanthophylls levels below 5g/tonne usually result in too pale a yolk. Check that a source of carotenoids is available in the feed. Adequate levels of supplemental xanthophyll in the diet. Levels below 5 g/tonne usually result in a too pale yolk
Suggested Actions
  • Technical assistance recommended
  • Can be managed with feed additives, off-the-shelf medications
  • Diagnosis should be confirmed with rapid assays and/or a certified laboratory

Impact on Egg quality

2

Impact on Liveability

0


Impact on Production

0

Overall Economic Impact

2



  1. Mark Pattison, Paul F. McMullin, Janet M. Bradbury. Dennis J. Alexander. 2008. Poultry Diseases. 6th Edition.page 30
  2. Steven Leeson, John D. Summers. 2008. Commercial Poultry Nutrition. Third Edition. page 96

 

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