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Effect of dietary calcium concentrations in low non-phytate phosphorus diets containing phytase on growth performance, bone mineralization, litter quality, and footpad dermatitis incidence in growing broiler chickens

  • Kim, Jong Hyuk (Department of Animal Science and Technology, Chung-Ang University) ;
  • Jung, Hyunjung (Animal Nutrition and Physiology Team, National Institute of Animal Science, Rural Development Administration) ;
  • Pitargue, Franco Martinez (Department of Animal Science and Technology, Chung-Ang University) ;
  • Han, Gi Ppeum (Department of Animal Science and Technology, Chung-Ang University) ;
  • Choi, Hyeon Seok (Department of Animal Science and Technology, Chung-Ang University) ;
  • Kil, Dong Yong (Department of Animal Science and Technology, Chung-Ang University)
  • Received : 2017.02.20
  • Accepted : 2017.04.11
  • Published : 2017.07.01

Abstract

Objective: An experiment was conducted to investigate the effect of dietary Ca concentrations in low non-phytate phosphorus (NPP) diets containing phytase on growth performance, bone mineralization, litter quality, and footpad dermatitis (FPD) incidence in growing broiler chickens. Methods: A total of 1,800 21-day-old Ross 308 growing broiler chickens were allotted to 1 of 6 dietary treatments with 6 replicated cages. Six diets were formulated to provide increasing Ca concentrations of 4.0, 5.0, 6.0, 7.0, 8.0, or 9.0 g/kg in diets. The concentrations of NPP in all diets were maintained at 3.0 g/kg, and phytase was supplemented to all diets at the level of 1,000 fytase units (FTU)/kg. At the end of the 14-d feeding trial, birds were euthanized for tibia sampling, and litter samples were collected from 3 areas in the cage. The FPD incidence was measured based on a 6-point scoring system. Results: Dietary Ca concentrations had no effect on growth performance of growing broiler chickens. However, a tendency (linear, p = 0.05) for decreased feed efficiency was observed as dietary Ca concentrations were increased. The concentrations of Ca and P in the tibia of broiler chickens increased (linear and quadratic, p<0.01) with increasing Ca concentrations in low NPP diets containing phytase. Litter pH, moisture, and N contents were not affected by increasing Ca concentrations in low NPP diets containing phytase. However, a tendency (quadratic, p = 0.10) for increased FPD incidence with increasing dietary Ca concentrations was observed. Conclusion: Dietary Ca concentrations from 4.0 to 9.0 g/kg in low NPP diets containing phytase have little effects on growth performance of growing broiler chickens. However, Ca and P concentrations in the tibia are decreased if dietary Ca concentrations are less than 5.0 g/kg. The FPD incidence for growing broiler chickens may be decreased if less than 9.0 g/kg of Ca is included in diets.

Keywords

Broiler Chicken;Dietary Calcium Concentration;Footpad Dermatitis;Growth Performance;Litter Quality;Phytase

Acknowledgement

Supported by : Rural Development Administration

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