Effects of high non‐phytate phosphorus starter diet on subsequent growth performance and carcass characteristics of broiler chickens

• Published in: Journal of animal physiology and animal nutrition Vol. 98; no. 4; pp. 643 - 650
• Main Authors: Baradaran, N, Shahir, M. H, Asadi Kermani, Z, Waldroup, P. W, Sirjani, M. A
• Format: Journal Article
• Language: English
• Published: Germany Blackwell Science 01.08.2014; Blackwell Publishing Ltd; Wiley Subscription Services, Inc
• Subjects: Animal Feed - analysis; Animal Nutritional Physiological Phenomena; Animals; Body Composition - drug effects; broiler chickens; broilers; carcass yield; Chickens - growth & development; Diet - veterinary; experimental diets; feed intake; grower; grower diets; growth performance; heart; liver; Male; non-phytate phosphorus; nutritional intervention; phosphorus; Phosphorus, Dietary - pharmacology; phytases; starter; starter diets; tissue weight; weight gain; broilers; performance; starter; grower; non-phytate phosphorus; carcass yield
• ISSN: 0931-2439; 1439-0396
• DOI: 10.1111/jpn.12106

The trial was performed to investigate the effects of different concentrations of non‐phytate phosphorus (nPP) in the starter and grower (with phytase inclusion) periods on carcass characteristics, organ weight and weekly variations of growth performance in the grower period. Seven hundred and twenty‐day‐old male broiler chickens were randomly assigned to 12 treatments in a completely randomized design. Chickens received two dietary treatments (4.5 g/kg and 6 g/kg nPP) in the starter (0–21 days) and six experimental diets (4 g/kg, 3.1 g/kg, 2.3 g/kg and 2.3 g/kg + 1000 FTU/Kg of feed phytase, 1.5 g/kg, 1.5 g/kg nPP + 1000 FTU/Kg of feed phytase) in the grower period (22–42 days). Results showed that phytase inclusion in the second and third weeks of grower period could increase feed intake significantly. Also, decrease in the concentrations of nPP to 1.5 g/kg caused to decline body weight gain markedly. Moreover, there is a significant difference between 4.5 g/kg and 6 + 4 g/kg nPP (starter+grower) and 1.5 g/kg nPP. Phytase inclusion increased carcass yield and declined liver weight significantly. Dietary treatment of 4.5 + 1.5 g/kg nPP enhanced heart and liver weight markedly. It is concluded that starter diets with increased concentration of nPP (6 g/kg nPP) had no beneficial effects on growth performance in the starter and grower period in the total (0–42 days). Also, it is possible to decrease nPP concentration of grower diets to 1.5 and 2.3 g/kg with and without phytase inclusion respectively.