title: Influence of vitamin deficiency and level of dietary protein on the incidence of leg problems in broiler chicks.
abstract: Diets containing either 22 or 30% protein were supplemented with a vitamin mix where one of 11 added vitamins were singly eliminated from the mix. Male, day-old broilers were fed these diets to 3 weeks of age, and weight gains, feed utilization, and leg problems were recorded. In general, the higher protein diet did not result in a greater incidence of leg problems; however, it did alter performance of several of the vitamin-deficient diets as compared to the lower protein diet. Of the 11 vitamins studied only nonsupplementation of riboflavin markedly reduced weight gain and feed utilization during the 3-week feeding period. However, deletions of vitamin D3 and niacin also resulted in reduced performance. Riboflavin deficiency resulted in paralysis in a high percentage of the birds while the niacin-deficient diet gave a high percentage of birds with deformed legs and problems of mobility. The results demonstrate that a high incidence of leg problems may be present in a flock with little or no signs of reduced gain or feed utilization. The data suggest that under practical conditions the elimination of a particular vitamin from a diet for a short period of time would probably have a negligible effect on performance.
mesh_terms: D000818:Animals; D001361:Avitaminosis / Q000662:veterinary*; D001835:Body Weight; D001851:Bone Diseases, Metabolic / Q000453:epidemiology / Q000662:veterinary*; D002645:Chickens; D004044:Dietary Proteins / Q000008:administration & dosage*; D005121:Extremities; D008297:Male; D011201:Poultry Diseases / Q000453:epidemiology*
chemical_list: D004044:Dietary Proteins