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Effects of high non‐phytate phosphorus starter diet on subsequent growth performance and carcass characteristics of broiler chickens
Author(s) -
Baradaran N.,
Shahir M. H.,
Asadi Kermani Z.,
Waldroup P. W.,
Sirjani M. A.
Publication year - 2014
Publication title -
journal of animal physiology and animal nutrition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.651
H-Index - 56
eISSN - 1439-0396
pISSN - 0931-2439
DOI - 10.1111/jpn.12106
Subject(s) - starter , broiler , phosphorus , food science , zoology , phytase , phytic acid , biology , chemistry , organic chemistry
Summary The trial was performed to investigate the effects of different concentrations of non‐phytate phosphorus (n PP ) 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 n PP ) 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 n PP + 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 n PP 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 n PP (starter+grower) and 1.5 g/kg n PP . Phytase inclusion increased carcass yield and declined liver weight significantly. Dietary treatment of 4.5 + 1.5 g/kg n PP enhanced heart and liver weight markedly. It is concluded that starter diets with increased concentration of n PP (6 g/kg n PP ) 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 n PP concentration of grower diets to 1.5 and 2.3 g/kg with and without phytase inclusion respectively.