Servicio de Información Comunitario sobre Investigación y Desarrollo - CORDIS

Incidence of tibial dyschondroplasia (TD) in turkeys

Three separate experiments investigated differences in TD incidence and severity between strains differing greatly in growth rate and conformation, whose body weight at 18 weeks ranged between 6.5 and 20kg and breast muscle mass as a proportion of body weight ranged from 17 -30%. The results indicated that TD occurred at an exceptionally high incidence across all turkey strains examined and peak incidence was similar (approximately 80%), in the commonly used commercial hybrid strain and the unselected Nebraska Spot strain. TD therefore appeared not to be influenced by selection for production traits.

A series of six experiments were conducted to determine the influence of sex, environmental temperature, light regimen and intensity and some nutritional factors on the development of TD in growing turkeys. Although TD incidence was high in both males and females, the incidence for males was significantly greater. TD incidence was not affected by light regimen or intensity, early qualitative feed restriction, dietary supplementation with 25(OH) D 3, or environmental temperature.

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