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Performance and bone development in broiler chickens given 25-hydroxycholecalciferol.

A Bar1, V Razaphkovsky, E Vax

  • 1Institute of Animal Science, Agricultural Research Organization, the Volcani Center, Bet Dagan, Israel. ariebar@agri.gov.il

British Poultry Science
|June 28, 2003
PubMed
Summary
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25-hydroxycholecalciferol (25OHD3) showed similar effects to vitamin D3 on chicken growth and bone health. However, 25OHD3 mitigated the negative impacts of phosphorus restriction on performance.

Area of Science:

  • Animal Nutrition
  • Poultry Science
  • Nutritional Biochemistry

Background:

  • Vitamin D3 is crucial for calcium and phosphorus metabolism in poultry.
  • 25-hydroxycholecalciferol (25OHD3) is an active metabolite of vitamin D3 with potential benefits.
  • Understanding the comparative efficacy of 25OHD3 and vitamin D3 is important for optimizing poultry diets.

Purpose of the Study:

  • To evaluate the effects of 25OHD3 compared to vitamin D3 on Cobb chicken performance and bone development.
  • To investigate the efficacy of 25OHD3 under adequate and restricted calcium (Ca) and phosphorus (P) dietary conditions.

Main Methods:

  • Five trials were conducted with Cobb chickens using formulated beadlets of 25OHD3 (HY-D).
  • Dietary treatments included varying levels of vitamin D3 or 25OHD3 supplementation (5-10 microg/kg or 75 microg/kg).

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  • Performance parameters (body weight, weight gain) and bone development indicators (bone ash, tibial dischondroplasia) were assessed.

    • Main Results:

    • Both vitamin D3 and 25OHD3 at 5-10 microg/kg were sufficient for normal body weight and bone ash.
    • 25OHD3 demonstrated a similar or slightly negative effect on body weight compared to vitamin D3 in some trials.
    • 25OHD3 significantly mitigated the negative effects of moderate phosphorus restriction on body weight gain and bone ash, but not calcium restriction.

    Conclusions:

    • 25OHD3 and vitamin D3 exhibit comparable effects on chicken growth and bone parameters under standard conditions.
    • 25OHD3 offers a potential advantage in alleviating the detrimental effects of phosphorus deficiency in poultry diets.
    • The mechanism by which 25OHD3 restrains P restriction effects requires further investigation, as increased P bioavailability was not evident.