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This experiment was conducted to determine whether dietary cholecalciferol will alleviate a calcium and phosphorous (Ca-P) deficiency when one-alpha-hydroxy-cholecalciferol, 1α(OH)D 3 , is supplemented, and to determine the effects of adequate and inadequate Ca-P when 1α(OH)D 3 is supplemented and vitamin D 3 is adequate. A total of 144 one-d-old broiler chicks (Ross 308) were allocated to 3 treatments. The dietary treatments were as follows: treatment A, adequate Ca-P + cholecalciferol + 5 μg/kg 1α(OH)D 3 ; treatment B, inadequate Ca-P + cholecalciferol + 5 μg/kg 1α(OH)D 3 ; treatment C, inadequate Ca-P + 5 μg/kg 1α(OH)D 3 . All diets were mixed with 500 FTU/kg of phytase, and cholecalciferol was provided in 5,000 IU/kg except for treatment C that fed diets without vitamin D 3. The Ca-P levels in the adequate diets were 0.90% Ca, 0.66% total phosphorus (tP); 0.75% Ca, 0.59% tP; 0.69% Ca, 0.54% tP for the starter, grower and finisher periods. At d 42 of age, broilers were inspected for incidence and severity of tibial dyschondroplasia (TD). The results showed that inadequate Ca-P supplementation with cholecalciferol significantly decreased the incidence of TD, score and tibia ash compared with broilers fed the same diet in the absence of cholecalciferol ( P  &lt; 0.05). The broilers fed inadequate Ca-P diets with cholecalciferol were unable to achieve the same tibia ash and incidence of TD as those fed Ca-P adequate diets ( P  &lt; 0.05). In conclusion, this trial suggests that broilers fed an inadequate Ca-P diet with 1α(OH)D 3 and adequate level of cholecalciferol are unable to sufficient bone formation. There was no indication that 1α(OH)D 3 in the absence of cholecalciferol was effective in reducing TD whereas it could improve tibia ash.

animal nutrition

Evaluation of one-alpha-hydroxy-cholecalciferol alone or in combination with cholecalciferol in Ca P deficiency diets on development of tibial dyschondroplasia in broiler chickens