In other species: cattle , sheep , horse , dog , alpaca , llama

Mendelian trait/disorder: unknown

Considered a defect: yes

Cross-species summary: Congenital abnormal shortness of the mandible (lower jaw), resulting in protrusion of the maxilla (upper jaw).

Markers: Using a comparative candidate gene strategy, based on evidence from humans, Rodrigues et al. (2013) could not identify any marker in the MATN1 gene (encoding Matrilin-1) to be associated with this disorder.

Breed: Zamorano-Leonés.