- Congenital myotonia is an inherited neuromuscular disorder known to occur in Nigerian Dwarf goats. It causes delayed muscle relaxation following voluntary movement, and sudden stiffness may cause an affected animal to fall briefly.
- Congenital myotonia is considered an undesirable genetic disorder by ADGA.
- The disorder is autosomal recessive — an animal must inherit two copies of the defective gene to be affected. Carriers possessing only one copy of the gene are phenotypically normal.
- Results from ADGA-approved laboratories for tests performed before January 1, 2026, may be added to the ADGA database at no charge when submitted directly by the laboratory. Tests requested on or after January 1, 2026, can be transferred for the current DNA Transfer Fee.
- Results from all tests conducted on or after January 1, 2021, by the breeder or any owner of record, will be publicly accessible to all ADGA members in the NG database.
- This testing is intended to assist ADGA members in managing their breeding programs. Test results will not affect an animal’s eligibility for registration with the Association.
Image credit: Rebekah Rupchis
Clear: No copies of the tested variant were detected.
Carrier: One copy was detected. The animal is not expected to be affected but may pass the variant to offspring.
Affected: Two copies were detected, and the animal may show signs of congenital myotonia.