Amino Acids Essential Deficiencies ...

Amino Acids Essential Deficiencies in Diet of Laying Hens

Amino Acids Essential Deficiencies in Diet of Laying Hens

Observed Clinical Signs Happenings

Egg drop

  • Egg production drops gradually

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

  • weight depression
  • Loss of body weight in adults

Feathers

  • Dull feather condition
  • A poor feathering condition or uneven feathers
  • Malformed Feathers or feather growth and structure affected
  • Poorly formed feathers
  • Poor feather cover or feather loss

Feed Consumption

  • Feed intake reduced

Shell quality

  • Egg size reduced or decreased

Internal Egg quality

  • Watery White or White Haugh unit decreased score should be 70 poor 50 (3)

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

  • Practical ingredients usually are limiting in one or more amino acids. It is often cost effective to supply the limiting amino acids in the form of synthetic amino acids, especially lysine and methionine

Amino Acids Essential Deficiencies in Diet of 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

  •  

 

 

Feed intake increased

 

  •  

 

Feed intake reduced or refusal

  •  

 

  • *

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 Body parts abnormalities yet or depend on the course time of the disease

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

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

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

*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
Marginal amino acid deficiencies. Commercial diets usually are formulated using a "least cost" approach. for this reason, the limiting amino acids in the diet are typically supplied with very little margin of safety.
Affected Systems/Organs
Egg production System
Spread
N/A
Mainly Affects
Egg production, Egg Quality, Body Weight, Performance
Solution
Adequate levels of limiting amino acids in the diet. Fortifying the limiting amino acids in the diet with feed grade amino acid as required
Suggested Actions
  • Can be managed with feed additives, off-the-shelf medications
  • Veterinary intervention is recommended

Impact on Egg quality

2

Impact on Liveability

0


Impact on Production

2

Overall Economic Impact

3



  1. Y.M. Saif.2008.Disease of Poultry. 12th Edition. page 1121
  2. David E. Swayne. 2013. Diseases of Poultry 13th Edition. page 1207
  3. Mark Pattison, Paul F. McMullin, Janet M. Bradbury. Dennis J. Alexander. 2008. Poultry Diseases. 6th Edition. page 30

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