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CM is Congenital Myotonia - it is a recessive disease

Myotonia slows the relaxation of muscles after voluntary contraction or electrical stimulation this shows up as difficulty rising to the horses feet, abnormal vocalization, a stiff gait, and rigin dlimbs, neck and trunk.

Myotonia has been found in the New Forest Pony.

There is no effective treatment.

Genetic Testing is available.

Genetic Codes:

N/N The horse is normal, and cannot produce affected offspring.

N/cm This horse carries CM and will pass the allele on to approx. 50% of its foals. If bred to another N/cm carrier, approximately 25% of the offspring will be normal, 50% will be carriers, and 25% will be affected.

cm/cm The horse is affected with congenital Myotonia and will pass one copy of CM to every foal.

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