Polydactylism in a white-tailed deer from eastern Ontario.

Area of Science:

• Veterinary Anatomy
• Developmental Biology
• Wildlife Science

Background:

• Polydactyly, the presence of supernumerary digits, is a congenital anomaly observed across various vertebrate species.
• Understanding the genetic and developmental basis of polydactyly can provide insights into evolutionary processes and limb development.
• Cervids, or deer, are important components of North American ecosystems, and documenting anomalies contributes to wildlife health studies.

Observation:

• A right front foot from a white-tailed deer (Odocoileus virginianus) fawn displaying polydactyly was collected in eastern Ontario, Canada.
• Gross visual and radiographic examinations were performed to analyze the morphological characteristics of the extra digit.
• The polydactylous condition presented a complete extra digit situated in the anatomical position of the first (ancestral) digit.

Findings:

• The study documented a rare case of perfect polydactyly in a white-tailed deer.
• The extra digit was fully formed and located in the position of the ancestral first digit, suggesting a developmental reversion or anomaly.
• This represents the first confirmed instance of this specific type of polydactyly within the North American cervid family.

Implications:

• This finding contributes valuable data to the understanding of limb development anomalies in mammals, particularly ungulates.
• The case provides a unique opportunity to study the genetic and developmental mechanisms underlying polydactyly in cervids.
• Documenting such anomalies is crucial for wildlife conservation and veterinary research, aiding in the assessment of population health and genetic diversity.