أمراض الدواجن الناتجة عن سوء الرعاية1

أمراض الدواجن الناتجة عن سوء الرعاية1

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Caged Layer Fatigue
Cage layer fatigue is a condition that is unique to hens that are in a
high state of egg production, primarily caged layer hens. The cause of
the condition is thought to be associated in an imbalance of
minerals/electrolytes in the body.
Rickets and abnormal bones in adult birds is commonly present. In layers
under thirty weeks of age, the cause is usually a temporary calcium
deficiency when egg production reaches eighty percent or higher. If
intake of calcium does not satisfy the need for egg production, the hen
will remove calcium stored in the bones. Ultimately, osteoporosis
develops, bones become soft and hens are subject to bone fractures.
Crippled and unable to stand, the hen suffers from the caged fatigue
symptoms.
Many hens show spontaneous recovery if removed from the cages and
allowed to walk normally on the floor. This indicates that a lack of
exercise may be a partial cause. Cage layer fatigue is more prevalent in
single-hen cages than in multiple-hen cages. When two or more hens are
caged together, they get more exercise because of competition for feed
and water.
Supplementation of the diet with phosphate, calcium and vitamin D3 is
usually helpful. Adding calcium to young birds by top-dressing the feed
with twenty pounds of oyster shell or limestone per one thousand hens
will often help the condition. In older hens, calcium deficiency is less
likely than phosphorus or vitamin D3 deficiencies. Recommended
treatment in these birds is to remove the hens from cages and top-dress
feed with equivalent level of dicalcium phosphate. Adding a
vitamin/electrolyte supplement to drinking water is recommended in any
age bird suffering from this condition.
Flocks that do not respond to the above therapy should be submitted to a
poultry disease diagnostic laboratory to determine the cause of the
problems. Several diseases can cause symptoms similar to caged layer
fatigue. Flock treatment for the condition can be prescribed after
diagnosis is completed

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