Abstract
An experiment was conducted to study the production performance of broiler breeder females (25 to 40 weeks of age) fed either reference diet or low non-phytate phosphorus (NPP) diet with or without microbial phytase (500 FYT/kg) supplementation. A weighed (160 g/b/d) quantity of feed from each diet was offered daily to 40 replicates of one bird each housed in California type cage having individual feeders. Each cage was considered as a replicate. A continuous 16-h light per day was provided using incandescent bulbs. Body weight, egg production, egg weight, feed per egg mass, egg specific gravity, egg breaking strength, shell thickness, tibia ash and serum Ca and protein concentrations were not affected by reducing the NPP level from 0.30 to 0.18% in the broiler breeder diet. Supplementation of phytase (500 FYT/kg) enzyme to the diet containing 0.18% NPP had no added advantage on any of the above production parameters. The serum inorganic P was increased significantly (p<0.05) by either enhancing the NPP content from 0.18 to 0.30% or supplementing phytase @500 FYT/kg to the diet containing low P which were found comparable. Retention of Ca and P was positive on all the diets. P retention decreased significantly (p<0.05) with either increase in NPP content or phytase supplementation in the diet. Neither NPP nor phytase supplementation influenced bone mineralization in terms of tibia ash and strength. The hatchability was not influenced by either increasing the NPP content or supplementing the enzyme phytase. Similarly, the P concentration in the egg yolk and day old chick, day old and 14 th day body weight and leg score was not altered by increasing the level of NPP or supplementing phytase enzyme. The mortality was within the normal limits in all the three dietary groups. Thus, it can be concluded that 0.18 %N PP (288 mg NPP intake/b/d) in the broiler breeder's diet is adequate in sustaining the optimum performance from 25 to 40 wks of age. Enhancing the NPP content or supplementation of phytase (500 FYT/kg diet) to diet containing 0.18% NPP had no added advantage on performance. (Asian-Aust. J. Anim. Sci. 2005. Vol 18, No. 9 : 1299-1304)
Highlights
Phytic acid with divalent cations and amino acids reduces the availability of P and reduces the Phosphorous (P) is an essential mineral required in digestibility and availability of amino acids and cations to poultry for normal physiological functions and optimum the birds (Sebastian et al, 1998)
Egg production, egg weight, feed per egg mass, egg specific gravity, egg breaking strength, shell thickness, tibia ash and serum Ca and protein concentrations were not affected by reducing the non-phytate phosphorus (NPP) level from 0.30 to 0.18% in the broiler breeder diet
Key Words : Non Phytate Phosphorus, Phytase, Broiler Breeders, Production Performance phytic acid with divalent cations and amino acids reduces the availability of P and reduces the Phosphorous (P) is an essential mineral required in digestibility and availability of amino acids and cations to poultry for normal physiological functions and optimum the birds (Sebastian et al, 1998)
Summary
Phytic acid with divalent cations and amino acids reduces the availability of P and reduces the Phosphorous (P) is an essential mineral required in digestibility and availability of amino acids and cations to poultry for normal physiological functions and optimum the birds (Sebastian et al, 1998). (Kornegay and Denbow, 1996; Sebastian et al, 1996; The concept of non-phytate phosphorus (NPP) Zhang et al, 1999; Ravindran et al, 2000) and layer requirement of chickens is gaining importance because of chickens (Carlos and Edwards, 1998; Um and Paik, 1999; increasing use of vegetable protein supplements in place of Boling et al, 2000; Keshavarz, 2000) the effect animal protein supplements in poultry diets. The of supplemental phytase on production performance of majority of P is in the form of phytic acid (PA) and it salts broiler breeders fed low P diets is yet to be investigated. Phytate phosphorus the effect of phytase supplementation on production (PP) is not available to the poultry because they do not performance of broiler breeders in terms of egg production, contain sufficient amounts of intrinsic phytase required to shell quality, bone mineralization, retention of calcium (Ca) hydrolyze the PP (Nelson, 1976; Schwarz, 1994).
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