Juvenile rickets and hyperparathyroidism in the Arctic fox

Area of Science:

• Veterinary Pathology
• Arctic Wildlife Biology
• Comparative Anatomy

Background:

• Arctic foxes (Alopex lagopus) inhabit diverse environments, including islands like St. Paul, Alaska.
• Nutritional deficiencies can significantly impact skeletal development in juvenile mammals.
• Previous studies on Arctic fox health in this region are limited.

Purpose of the Study:

• To diagnose and characterize skeletal abnormalities in Arctic fox kits from St. Paul Island.
• To investigate potential causes of observed diseases, focusing on nutritional and environmental factors.
• To document the pathological findings in affected individuals.

Main Methods:

• Radiographic examination of affected Arctic fox kits.
• Morphologic and histologic analysis of bone tissues.
• Clinical assessment for other potential abnormalities.

Main Results:

• Three out of seven Arctic fox kits showed radiographic and histologic evidence of rickets and hyperparathyroidism.
• Skeletal lesions included growth plate columnar hyperplasia and metaphyseal osteodystrophia fibrosa.
• One kit presented with bilateral metaphyseal fractures due to weakened bone structure.

Conclusions:

• The findings suggest a juvenile-onset skeletal disease in Arctic foxes, likely linked to calcium deficiency post-weaning.
• Rickets and hyperparathyroidism are significant health concerns for young Arctic foxes in this environment.
• Further research into the specific dietary and environmental factors is warranted.