Evaluation of the effect of a highly soluble calcium source in broiler diets supplemented with phytase on performance, nutrient digestibility, foot ash, mobility and leg weakness
E. J. Bradbury A , S. J. Wilkinson A D , G. M. Cronin A , P. Thomson B , C. L. Walk C and A. J. Cowieson A
+ Author Affiliations
- Author Affiliations
A Poultry Research Foundation, The University of Sydney, Faculty of Veterinary Science, Camden, NSW 2570, Australia.
B The University of Sydney, Faculty of Veterinary Science, Camden, NSW 2570, Australia.
C AB Vista Feed Ingredients, Marlborough, Wiltshire, UK.
D Corresponding author. Email: stuart.wilkinson@sydney.edu.au
Animal Production Science 57(10) 2016-2026 https://doi.org/10.1071/AN16142
Submitted: 6 March 2016 Accepted: 24 June 2016 Published: 30 August 2016
Abstract
High inclusion concentrations of dietary calcium (Ca) from limestone may have detrimental effects on broiler performance, such as increased gastric pH and a reduction in phosphorus (P) and amino acid digestibility. To assess the potential for feeding diets with lower total Ca concentrations, the effect of a novel highly soluble source of calcium (HSC) on bird performance, nutrient digestibility and skeletal integrity of 1120 male Cobb-500 broilers was compared with that of limestone. Eight dietary treatments in a 2 × 2 × 2 factorial design consisted of two sources of Ca (limestone or HSC), two concentrations of Ca (6.0 or 7.7 g/kg in the starter and 4.0 or 5.7 g/kg in the grower), two phytase levels (0 or 500 FTU/kg). The effect of dietary treatments on growth performance and feed intake were measured from Day 1 to Day 40 and foot ash and leg health on Day 40. At the end of the starter period, in the absence of phytase, changing Ca source from limestone to HSC at 6.0 g/kg total Ca decreased both bodyweight gain and feed intake (P < 0.05). The addition of phytase to diets containing 6.0 g/kg total Ca provided by HSC increased bodyweight gain (P < 0.05), as well as increasing feed intake (P < 0.05). At the end of the grower period, diets supplemented with phytase increased bodyweight gain (P < 0.001), birds fed the higher Ca concentration were also observed to have an increased bodyweight gain (P < 0.001). Apparent ileal Ca digestibility significantly increased with the addition of phytase to diets containing 4.0 g/kg total Ca provided by HSC (P < 0.05), this was also observed for P digestibility. Replacement of limestone with HSC when fed in conjunction with phytase has the potential to be an effective strategy to improve broiler performance and bone mineralisation.
Additional keywords: phosphorus, skeletal health.
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