title: Effect of casein phosphopeptide and 25-hydroxycholecalciferol on tibial dyschondroplasia in growing broiler chickens.
abstract: 1. An experiment was conducted to investigate the influence of dietary casein phosphopeptides and 25-hydroxycholecalciferol on the incidence of tibial dyschondroplasia (TD) in 14-d-old commercial broiler chickens. 2. Three hundred and twenty broiler chicks (one day old) were randomly allocated to one of 4 dietary treatments. A standard broiler diet was used as the control with the three experimental treatments receiving the control diet supplemented with 10 g casein phosphopeptide/kg, 14 g casein phosphopeptide/kg or 69 microg 25-hydroxycholecalciferol/kg. 3. Those birds fed the diets supplemented with 14g casein phosphopeptide/kg or 25-hydroxycholecalciferol had a lower incidence of TD than both the control and 10g casein phosphopeptide/kg treatments when assessed grossly. 4. The body weight of birds fed the 10 g casein phosphopeptide/kg diet or the 25-hydroxycholecalciferol diet was higher than birds fed the control diet. Although not significant, the body weight of birds fed the 14 g casein phosphopeptide/kg diet was also greater than the control birds. 5. The current experiment demonstrated that both casein phosphopeptide and 25-hydroxycholecalciferol can reduce the incidence of TD in the young broiler chicken. More research is required to explain the unexpected increase in body weight described above.
authors.affiliation: Department of Primary Industries, Attwood, Victoria, Australia.
authors.forename: G B
authors.initials: GB
authors.lastname: Parkinson
authors.forename: P H
authors.initials: PH
authors.lastname: Cransberg
mesh_terms: D000821:Animal Feed / Q000032:analysis; D000818:Animals; D001835:Body Weight / Q000187:drug effects; D002112:Calcifediol / Q000627:therapeutic use*; D002118:Calcium / Q000032:analysis; D002364:Caseins / Q000627:therapeutic use*; D002645:Chickens / Q000254:growth & development*; D004305:Dose-Response Relationship, Drug; D005260:Female; D006614:Hindlimb / Q000254:growth & development; D008297:Male; D010009:Osteochondrodysplasias / Q000517:prevention & control / Q000662:veterinary*; D010748:Phosphopeptides / Q000627:therapeutic use*; D010758:Phosphorus / Q000032:analysis; D011201:Poultry Diseases / Q000517:prevention & control*
chemical_list: D002364:Caseins; D010748:Phosphopeptides; D010758:Phosphorus; D002112:Calcifediol; D002118:Calcium