Calcium and Phosphorus Deficiency o ...

Calcium and Phosphorus Deficiency or Imbalance in Laying Hens

Calcium and Phosphorus Deficiency or Imbalance in Laying Hens

Observed Clinical Signs happenings

Egg drop

  • Egg production drops gradually
  • In laying hens, calcium deficiency results in reduced egg production and thin-shelled eggs

Egg quality

  • Thin-shelled and soft-shelled or porous eggs
  • May increase the incidence of thin-shelled eggs
  • Calcium and phosphorus deficiency results in reduced egg production and thin-shelled eggs
  • Ungraded or second's eggs increased
  • Egg specific gravity score lower (should be above 1.080 (1.068 thin shells)

Diet or Feed Changes

  • Recent Feed delivery
  • Recent formulation / diet
  • Sometimes it is difficult to find a relationship with the diet or feed origin

Calcium and Phosphorus Deficiency or Imbalance in Laying Hens show, exhibit, or manifest any of the following clinical signs happenings:

Observed Clinical Signs Happenings

ALWAYS

NEVER

SOMETIMES

Egg drop

  •  

 

 

Egg production declines rapidly

 

  •  

 

Egg production drops gradually

  •  

 

 

Mortality above the standard

 

  •  

 

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
Calcium (Ca) and Phosphorous (P) deficiency or imbalance in the diet. Decreased of normal mineralization of structural bone and egg-shell. According to Long et al. phosphorous deficiency (0.2% available dietary P) and calcium excess (2.24% Ca and 0.45% available P) resulted in similar abnormalities of the tibia. Birds die of right ventricular failure, often accompanied by ascities. Calcium and phosphorous are closely associated in metabolism processes, particularly in bone and eggshell formation.
Affected Systems/Organs
Reproductive and locomotor systems
Spread
N/A
Mainly Affects
Egg production, egg quality and performance
Solution
Supplementation of the diet with Vitamin D and appropriate Ca and P ratio and levels. The availability of phosphorous can be increased by inclusion in the diet of phytase of microbial or plant origin. The phosphorous in plant-base feedstuffs is poorly available because much of it is present in phytic acid and is not released by digestive enzymes.
Suggested Actions
  • Can be confirmed with clinical signs and gross lesions
  • 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
  • Veterinary intervention is recommended

Impact on Egg quality

3

Impact on Liveability

0


Impact on Production

3

Overall Economic Impact

2



  1. Y.M. Saif. 2008. Disease of Poultry. 12th Edition. page 1137,1157
  2. David E. Swayne. 2013.  Diseases of Poultry 13th Edition. page 1222,1240
  3. B.S, Bains. 1979 A Manual of Poultry Diseases. Editiones <Roche>, page 216

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