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• Myotonia Congenita: delay in the ability to relax muscles after forceful contractions
• Occurs in a variety of animals.
• First documented in the 1880s
• Dr. H.H Mayberry began breeding them for meat.
• Easy to contain, and they had excellent meat quality
• There are two main strains of the goats found in Tennessee and Texas.
• Myotonia is caused by an irregularity in the gene called the Chlorine Channel 1 (CLCN1), located on the seventh chromosome, position 35.
• This gene controls the proteins that allow for the flexing and relaxing of muscles.
• CLCN1 affects the negatively charged chloride ions, which signal for the muscles to relax, with an imbalance of these ions, the muscles remain stiff.
Genetics
• Crossing these goats with
other breeds causes the
heterozygous condition (carriers)
• Testing for Myotonia in goats is not common, rely on symptoms