Calcium Tetany in Laying Hens

Calcium Tetany in Laying Hens

Calcium Tetany in Laying Hens

Observed Clinical Signs Happenings

Visibly sick birds

  • Marked leg weakness
  • Affected birds may be recover if removed to a recovery pen, usually, after they have laid an egg
  • Reluctant to move
  • Sometimes weak birds are found on the litter (It is presumed that they are too weak to jump up to the nest box).

Lameness or unusual movement incoordination ataxia

  • Marked leg weakness
  • Affected birds show marked leg weakness but many recover if removed to a recovery pen, usually after they have laid an egg

Neurological / Nervous

  • Paralysed birds are found on the nest. Sometimes weak birds are found on the litter (It is presumed that they are too weak to jump up to the nest box)
  • Paralysis in severe cases

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

  • Marked leg weakness
  • Leg paralysis

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

  • Recent formulation /diet
  • Changing to a layer diet before beginning to lay appears to predispose to this condition (happening in Broiler parent)

Calcium Tetany in Laying Hens 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

  •  

 

 

Few visibly sick birds

  •  

 

 

Many visibly sick birds

 

  •  

 

Flock behaviour activity change

 

  •  

 

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

 

 

Causing Agents
Metabolic disorder. Hypocalcemia. Low available calcium in the bloodstream. This indicates that the hen used all available calcium from the bloodstream in an effort to complete the egg shell.
Affected Systems/Organs
Locomotion system. Legs
Spread
N/A
Mainly Affects
Performance,
Solution
Supplementation of calcium in the form of shell grit from first egg. Vitamin D in drinking water. Increased vitamin D in the diet. Managing birds for maximum uniformity.
Suggested Actions
  • Can be confirmed with clinical signs and gross lesions
  • Can be managed with feed additives, off-the-shelf medications
  • Diagnosis should be confirmed with rapid assays and/or a certified laboratory
  • Veterinary intervention is recommended

Impact on Egg quality

0

Impact on Liveability

0


Impact on Production

0

Overall Economic Impact

1



 

 

  1. Y.M. Saif.2008.Disease of Poultry. 12th Edition.
  2. David E. Swayne. 2013. Diseases of Poultry 13th Edition.
  3. Mark Pattison, Paul F. McMullin, Janet M. Bradbury. Dennis J. Alexander. 2008. Poultry Diseases. 6th Edition. page 543
  4. Paul McMullin. 2004. A Pocket Guide to Poultry Health and Disease. First Edition. page 93
  5. B.S, Bains. 1979 A Manual of Poultry Diseases. Editiones <Roche>, page 216

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