Osteochondrosis in feedlot cattle.

Beginning in summer 1977 and continuing through four consecutive seasons, we examined lame limb joints from 106 partially fattened cattle and 28,235 pairs of occipital condyles from fully fattened cattle for osteochondrosis. Of the 106 lame cattle, nine (8.5%) had characteristic lesions, usually in their stifle joints, and of the 28,235 atlanto-occipital joints, 1063 (3.

Laryngeal diphtheria and papillomatosis in feedlot cattle.

In a random sample of 30,444 larynges from slaughtered beef cattle, 441 (1.4%) had chronic diphtheria and 1,345 (4.4%) had papillomatosis.

Laryngeal contact ulcers in feedlot cattle.

Of 30,444 larynges from fattened cattle at three companies, 3,985 (13.1%) had contact ulcers or ulcer scars in the mucous membranes over the vocal processes and medial angles of the arytenoid cartilages. The incidence was higher in cattle fed during fall than in cattle fed during other seasons.

Limb arthropathies and periarticular injuries in feedlot cattle.

Beginning summer 1977 and continuing through 4 consecutive seasons, we examined samples of at least 25, and a total of 106, lame limbs or joints from slaughtered beef cattle. Of this number about 64 (60%) were articular and 42 (40%) periarticular lesions. Fifty-three were caused by trauma and 9 by osteochondrosis.