Failure of Bone Resorption in a Calf

The case concerns a 22 kg male Abcrdeen Angus calf which could not risc following dclivcry at term. I t was noted to have pronounced superior prognathia, the eyes bulgcd from the sockcts and the forehead was domcd. The calf lay flat on its side; opisthotonus and nystagmus werc present when thc calf was movcd. Aside from thc abnormalities of thc head the remainder of the skcleton was of normal conformation in the live animal. The herdsman rcported that four calves with a similar deformity of thc head had been delivered in the same herd of purebred Aberdeen Angus. Three were dead when expclled and one lived a few hours. Three of these four calves, as well as the one reported in this paper, had the same sire. Slaughter of the sire and dam of the case dcscribed in this paper prevented a test mating. The bones were not examincd on the previous four calves. Gross Examination 'The autopsy revealed pronounced superior prognathia. 'The teeth had not erupted completely and wcre not in a normal position in a single row. The surfac