Combined Immunodeficiency of Arabian Horses: Confirmation of Autosomal Recessive Mode of Inheritance

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Abstract
SUMMARY: A 3-year prospective breeding trial was designed to verify the mode of inheritance of combined immunodeficiency (cid) in Arabian horses. Twenty-six mares that had previously produced foals with cid were mated to a stallion that had sired foals with cid. Of 53 foals obtained, 15 (28.3%) had cid. The ratio of female to male foals was 28:25, and the ratio of female cid to male cid foals was 8:7. The results of this trial confirmed a suggestion that cid in Arabian horses is inherited as an autosomal recessive trait.

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