Original scientific paper

https://doi.org/10.24099/vet. arhiv.1662

Evaluation of different levels of Bacillus sp. (HCYL03) phytase in broiler chickens fed maize-soyabean meal based diets with a low non-phytate phosphorus content

Rozina Sardar ; University Institute of Biochemistry and Biotechnology, Pir Mehr Ali Shah-Arid Agriculture University Rawalpindi, Rawalpindi, Pakistan
Muhammad Javaid Asad ; University Institute of Biochemistry and Biotechnology, Pir Mehr Ali Shah-Arid Agriculture University Rawalpindi, Rawalpindi, Pakistan
Muhammad Sheeraz Ahmad ; University Institute of Biochemistry and Biotechnology, Pir Mehr Ali Shah-Arid Agriculture University Rawalpindi, Rawalpindi, Pakistan
Tanveer Ahmad ; Department of Livestock Production and Management, Faculty of Veterinary and Animal Sciences, Pir Mehr Ali Shah-Arid Agriculture University Rawalpindi, Rawalpindi, Pakistan
Syed Muhammad Kamal Nasir ; Poultry Research Institute, Murree Road, Shamsabad, Rawalpindi, Pakistan

Abstract

The objective of the present study was to evaluate the impact of various levels of phytase derived from Bacillus sp. (HCYL03) in corn-soy diets fed to broilers. Experimental treatments included a positive control (PC) with a calculated non-phytate phosphorus (nPP) level of 4.0g/kg for the 35 days of trial. The negative control (NC) diet included a reduction in nPP to 3.0g/kg during the experiment, and commercially available phytase (@500FTU/kg), as well as new bacterial phytase added to the NC diet in increasing amounts of 500, 800, and 1100FTU/kg. Treatment effects on growth performance, the apparent digestibility of P, tibia mineralization, and Ca and P status in blood plasma were evaluated on day 35. The NC diet decreased feed intake (P<0.05), body weight gain (BWG) (P<0.05), and improved feed conversion ratio (FCR) (P<0.05) compared to the PC. Phytase addition improved all growth parameters. Birds fed the NC diet displayed lower (P<0.05) digestibility of P, reduced (P<0.05) tibial mineralization, and decreased (P<0.05) P and Ca concentrations in blood plasma compared to birds fed the PC diet. Improvements in digestibility of P, tibia mineralization, and mineral contents in blood plasma were observed with phytase addition. High level inclusion of phytase (1100FTU/kg) yielded the greatest improvement in bird performance, nutrient digestibility, and bone mineralization in the NC group and low levels of phytase treatments. It may be concluded that inorganic P incorporated in the normal-nPP diet of chickens could be effectively replaced by a Bacillus sp. (HCYL03) phytase diet without any adverse effect on the performance and nutrient use of broilers.

Keywords

Bacillus sp. (HCYL03); bacterial phytase; non-phytate phosphorus; growth performance; digestibility

Hrčak ID:

283897

URI

https://hrcak.srce.hr/283897

Publication date:

26.9.2022.

Article data in other languages: croatian

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