أمراض الدواجن الناتجة عن سوء الرعاية2

أمراض الدواجن الناتجة عن سوء الرعاية2

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FatigueFatty Liver Hemorrhagic Syndrome
Fatty liver syndrome is a condition that affects only hens. The basic
cause is thought to be excessive dietary energy intake. Hereditary
tendencies vary among various strains of egg production stock, but
heredity is not the entire cause for this malady. Laying hens housed in
cages are most often affected since they are less able to get sufficient
exercise and dispose of the extra dietary energy.
Birds within a flock that are most often affected are the high
producers. This indicates that physiological energy metabolism and
production are closely associated with this condition. Mortality varies
considerably among flocks but can become excessive in some cases.
Lesions include accumulation of large amount of abdominal fat; enlarged,
easily damaged liver and presence of blood clots that indicate that
hemorrhages have occurred prior to death. Death usually is caused by a
fatal internal hemorrhage originating in a portion of the liver. This
hemorrhage is often caused as the hen is straining to lay her egg and
the enlarged, friable liver is more vulnerable to injury. When a large
blood vessel ruptures, sufficient blood is lost to cause death of the
hen.
The primary treatment for this condition requires an alteration of the
diet or amount of dietary energy consumed. Replacement of some of the
corn in the diet with lower energy feedstuffs like wheat bran can
provide a lower energy diet. If a complete layer ration is being fed,
addition of vitamins can be of benefit. If grains are the primary
feedstuff, it is suggested that the birds be switched to a complete
layer diet. Control of body fat is the only successful remedy for this
condition and is best accomplished by regulation and reduction of total
energy intake