Vitamin D3 requirement of young chicks receiving diets varying in calcium and available phosphorus

D. H. Baker, R. R. Biehl, J. L. Emmert

Research output: Contribution to journalArticlepeer-review

Abstract

1. Three battery experiments were conducted with broiler chicks during the 2nd and 3rd week of life. Graded amounts of cholecalciferol (D3) were added to maize-soyabean meal diets that were designed to be (a) severely deficient in available phosphorus (P), (b) marginally deficient in calcium (Ca) or (c) adequate in both available P and Ca. 2. With diets containing 1·0 g available P and 6-3 g Ca/kg (assay 1), graded doses of D3 between 0 and 37·5 μ/kg produced linear (P<0·05) positive responses in both weight gain and tibia ash. With a D3 concentration of 1250 μg/kg, 250 times the requirement recommended by the NRC, bone ash was increased (P<0·05) over that of birds fed 37·5 μg/kg, and neither weight gain nor food intake were reduced. 3. With a P- adequate diet (4·5 g available P/kg) containing 8·5 g Ca/kg (assay 2), weight gain and bone ash increased linearly (P<0·05) upon supplementing the basal diet with , 2·5 and 5·0 μg D3/kg. Higher doses of D3 did not elicit further responses, and chicks fed on a diet containing 1250 μg D3/kg gained as fast and had bone ash values that did not differ from those of chicks receiving 5, 10, 20 or 40 μg D3/kg. 4. When the maize-soyabean meal basal diet was fortified with Ca and P to achieve adequate amounts of Ca (10-1 g/kg) and P (4·5 g available P/kg) in assay 3, dietary additions produced results similar to those obtained in assay 2 where P was adequate and Ca was slightly deficient. Again, chicks receiving a surfeit of D3 (1250 μg/kg) exhibited weight gains and bone ash values that were as great as those of chicks receiving 5, 10, 15 or 30 μg D3/kg. 5. It is apparent that young chicks have a high tolerance for excess D3, and chicks fed on diets that are severely deficient in available P continue to respond to D3 in excess of 37·5 μg/kg.

Original languageEnglish (US)
Pages (from-to)413-417
Number of pages5
JournalBritish Poultry Science
Volume39
Issue number3
DOIs
StatePublished - Jul 1998

ASJC Scopus subject areas

  • Food Science
  • Animal Science and Zoology

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