Radiographic evaluation of the forelimb bone development in maned wolves (Chrysocyon brachyurus)

Area of Science:

• Comparative anatomy
• Veterinary radiology
• Canid developmental biology

Background:

• Understanding skeletal development in wild canids is crucial for conservation and veterinary care.
• Epiphyseal growth plates and secondary ossification centers are key indicators of skeletal maturity.
• Limited data exists on the specific timing of these developmental milestones in maned wolves (Chrysocyon brachyurus).

Purpose of the Study:

• To radiographically assess the fusion of growth plates and development of secondary ossification centers in maned wolf forelimb bones.
• To compare these findings with established data from domestic dogs (Canis lupus familiaris).
• To document species-specific timelines for skeletal maturation in maned wolves.

Main Methods:

• Monthly radiographic evaluations of forelimbs from three maned wolves (ages 3-4 months to 18-19 months).
• Systematic recording of growth plate closure and secondary ossification center development.
• Statistical analysis to compare epiphyseal areas and identify significant developmental differences over time.

Main Results:

• Specific closure times were determined for multiple growth plates, including the supraglenoid tubercle (7-8 months) and proximal humerus (17-19 months).
• Significant differences in secondary ossification center areas were noted in the proximal humerus and radius early in development.
• While overall radiographic appearance is similar to domestic dogs, distinct variations in growth plate closure timing were observed.

Conclusions:

• Maned wolves exhibit a unique pattern of epiphyseal growth plate fusion and secondary ossification center development compared to domestic dogs.
• The radiographic assessment provides valuable species-specific data for understanding maned wolf skeletal maturation.
• These findings contribute to the comparative anatomy and developmental biology of wild canids.