Studies on the pathogeneis of tibial dyschondroplasia in chickens. IV. Some features of the vascular supply to the growth plates of the tibiotarsus.

Several features of the vascular supply to the growth plates of the tibiotarsus were compared in two strains of broiler chickens selected for a high and low incidence of tibial dyschondroplasia. No difference was found between the two strains in the area of the proximal growth plate of the tibiotarsus or in the distance of the nutrient foramen from the same growth plate. Vascular tunnels invading the zone of hypertrophy were significantly fewer in the proximal growth plate than in the distal growth plate, and tunnels invading the zone of hypertrophy of each growth plate were also fewer in the high-incidence chickens than in the low-incidence chickens.