Congenital chondrodystrophy (Chondrodysplasia) of unknown origin (CCUO) is a rare congenital disease of free range beef cattle herds in southeastern Australia.
Anecdotal evidence suggests that periods of drought during the gestation period may induce cartilage malformations in the fetus in utero.
Clinically affected calves present with disproportionate dwarfism and excessive extension of metacarpophalangeal and metatarsophalangeal joints. The limbs are often disproportionally short, compared with their trunk size, and wide epiphyses of the femurs and humeri.
A diagnosis is based on presenting clinical signs and histopathological features of chondrodysplasia in affected limbs.
No treatment is usually instigated as most calves cope with this disease adequately. Severely affected calves are usually euthanized.
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