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cold stress
how can be diagnosed the death of bird due to cold stress by post mortem?
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3 Replies
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Watery nostrils.
Coughing
Congested lungs at postmortem.
Expanded bronchioles.
Moisty and blocked tracheal.
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Laboratory test
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Empty or Partially Filled Crop
Cardiovascular System Auricular Dilation (especially Right Atrium). The atria may be dilated and filled with dark, unclotted blood. Contracted Ventricles (less consistent). Reflects cardiac failure and circulatory shutdown (likely cardiac arrest as the final cause of death).
Visceral Congestion Severe Congestion of the Liver, Spleen, and Kidneys. The entire carcass may show intense, generalised congestion. A major physiological effect of cold is peripheral vasoconstriction to conserve heat, leading to central organ congestion.
Lungs Pulmonary Congestion and Edema (Swollen, heavy lungs). Consistent with acute cardiac failure and the redistribution of blood volume to the central organs.
Fat Reserves Absence of Epicardial and/or Perirenal Fat (especially in young birds). The bird has rapidly utilized energy reserves (fat) in a desperate attempt to generate heat (non-shivering thermogenesis).
Gastrointestinal Tract Often non-specific or slightly empty, reflecting the bird’s systemic distress preventing normal eating and digestion.
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