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Abstract
Extract
The hereditary disease known as dwarfism (bovine achondroplasia) has been recognized in several breeds of cattle for many years. These include the Dexter (Crew, Citation1923), Shorthorn (Stonaker and Tom, Citation1944; Baker et al, Citation1950), Jersey (Mead et al., Citation1946), Friesian (Berger and Innes, Citation1948), Hereford (Johnson et al., Citation1950), Aberdeen Angus (Baker et at, Citation1951; Bovard and Priode, Citation1965) and Florida native cattle (Dollahon et al., Citation1957; Dollahon and Koger, Citation1960). The dwarfs associated with these different breeds have been variously classified as long headed dwarfs, bull dogs, short headed dwarfs, compacts, comprests and various other achondroplastic forms. A careful study of these by Gregory et al., Citation(1966) indicated that all achondroplastic mutants in cattle are probably inter-related and components of the same genetic complex. Confirmatory evidence of this has been reported previously by crossmating experiments between Aberdeen Angus and Hereford cattle (Chambers et al., Citation1954; Burris and Priode, Citation1956; Gregory and Carroll, Citation1956).