The effects of excess non-phytate phosphorus from dicalcium phosphate or phytase supplementary sources on performance in laying hens fed reduced-protein diets
Summary: The rapid growth of industrial egg production has intensified environmental and economic pressures, prompting the adoption of reduced crude protein (CP) diets supplemented with amino acids to lower costs and nitrogen waste. However, CP reduction may limit phosphorus availability, potentiall...
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Elsevier
2025-12-01
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| Series: | Journal of Applied Poultry Research |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1056617125000595 |
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| author | Hazhir Mazhar Sina Payvastegan Mohsen Daneshyar Seyed Ali Mirghelenj |
| author_facet | Hazhir Mazhar Sina Payvastegan Mohsen Daneshyar Seyed Ali Mirghelenj |
| author_sort | Hazhir Mazhar |
| collection | DOAJ |
| description | Summary: The rapid growth of industrial egg production has intensified environmental and economic pressures, prompting the adoption of reduced crude protein (CP) diets supplemented with amino acids to lower costs and nitrogen waste. However, CP reduction may limit phosphorus availability, potentially impairing energy metabolism. This study investigates whether adding extra non-phytate phosphorus (NPP) from mineral (dicalcium phosphate, DCP) and enzymatic (phytase) sources can improve performance, nutrient use, and egg quality in hens fed reduced-CP diets. A total of 528 Hy-Line W36 hens (50 weeks old) were used in a 2 × 5 + 1 factorial design. The CP levels included 14 % and 15 % (2 % and 1 % below the recommended level), and excess NPP treatments consisted of: no additional NPP (recommended NPP level), 1 and 2 g/kg extra NPP via added DCP, and 1.6 and 2 g/kg extra NPP via phytase supplementation (250 and 500 FYT/kg). A control diet containing 16 % CP (recommended CP level) was included as the eleventh treatment. Key findings showed phytase at 250–500 FYT/kg significantly improved egg production, egg mass, and feed conversion ratio compared to unsupplemented diets. Notably, 500 FYT/kg phytase enhanced digestibility of gross energy, CP, ether extract, and calcium, whereas inclusion of NPP from DCP reduced calcium digestibility. Interactive effects between CP and excess NPP were observed: 500 FYT/kg phytase in 15 % CP diets improved P digestibility and eggshell strength, while both phytase levels increased eggshell thickness. In conclusion, phytase supplementation improved laying hen performance in reduced-CP diets through extra-phosphoric effects, while excess NPP from DCP was ineffective. |
| format | Article |
| id | doaj-art-7e1b0da42bba405598dc411eebd7f6e4 |
| institution | Kabale University |
| issn | 1056-6171 |
| language | English |
| publishDate | 2025-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Applied Poultry Research |
| spelling | doaj-art-7e1b0da42bba405598dc411eebd7f6e42025-08-20T04:00:27ZengElsevierJournal of Applied Poultry Research1056-61712025-12-0134410057510.1016/j.japr.2025.100575The effects of excess non-phytate phosphorus from dicalcium phosphate or phytase supplementary sources on performance in laying hens fed reduced-protein dietsHazhir Mazhar0Sina Payvastegan1Mohsen Daneshyar2Seyed Ali Mirghelenj3Department of Animal Science, Faculty of Agriculture, Urmia University, Urmia, IranCorresponding author.; Department of Animal Science, Faculty of Agriculture, Urmia University, Urmia, IranDepartment of Animal Science, Faculty of Agriculture, Urmia University, Urmia, IranDepartment of Animal Science, Faculty of Agriculture, Urmia University, Urmia, IranSummary: The rapid growth of industrial egg production has intensified environmental and economic pressures, prompting the adoption of reduced crude protein (CP) diets supplemented with amino acids to lower costs and nitrogen waste. However, CP reduction may limit phosphorus availability, potentially impairing energy metabolism. This study investigates whether adding extra non-phytate phosphorus (NPP) from mineral (dicalcium phosphate, DCP) and enzymatic (phytase) sources can improve performance, nutrient use, and egg quality in hens fed reduced-CP diets. A total of 528 Hy-Line W36 hens (50 weeks old) were used in a 2 × 5 + 1 factorial design. The CP levels included 14 % and 15 % (2 % and 1 % below the recommended level), and excess NPP treatments consisted of: no additional NPP (recommended NPP level), 1 and 2 g/kg extra NPP via added DCP, and 1.6 and 2 g/kg extra NPP via phytase supplementation (250 and 500 FYT/kg). A control diet containing 16 % CP (recommended CP level) was included as the eleventh treatment. Key findings showed phytase at 250–500 FYT/kg significantly improved egg production, egg mass, and feed conversion ratio compared to unsupplemented diets. Notably, 500 FYT/kg phytase enhanced digestibility of gross energy, CP, ether extract, and calcium, whereas inclusion of NPP from DCP reduced calcium digestibility. Interactive effects between CP and excess NPP were observed: 500 FYT/kg phytase in 15 % CP diets improved P digestibility and eggshell strength, while both phytase levels increased eggshell thickness. In conclusion, phytase supplementation improved laying hen performance in reduced-CP diets through extra-phosphoric effects, while excess NPP from DCP was ineffective.http://www.sciencedirect.com/science/article/pii/S1056617125000595Excess non-phytate phosphorusLaying hensProductive performancePhytaseReduced protein diets |
| spellingShingle | Hazhir Mazhar Sina Payvastegan Mohsen Daneshyar Seyed Ali Mirghelenj The effects of excess non-phytate phosphorus from dicalcium phosphate or phytase supplementary sources on performance in laying hens fed reduced-protein diets Journal of Applied Poultry Research Excess non-phytate phosphorus Laying hens Productive performance Phytase Reduced protein diets |
| title | The effects of excess non-phytate phosphorus from dicalcium phosphate or phytase supplementary sources on performance in laying hens fed reduced-protein diets |
| title_full | The effects of excess non-phytate phosphorus from dicalcium phosphate or phytase supplementary sources on performance in laying hens fed reduced-protein diets |
| title_fullStr | The effects of excess non-phytate phosphorus from dicalcium phosphate or phytase supplementary sources on performance in laying hens fed reduced-protein diets |
| title_full_unstemmed | The effects of excess non-phytate phosphorus from dicalcium phosphate or phytase supplementary sources on performance in laying hens fed reduced-protein diets |
| title_short | The effects of excess non-phytate phosphorus from dicalcium phosphate or phytase supplementary sources on performance in laying hens fed reduced-protein diets |
| title_sort | effects of excess non phytate phosphorus from dicalcium phosphate or phytase supplementary sources on performance in laying hens fed reduced protein diets |
| topic | Excess non-phytate phosphorus Laying hens Productive performance Phytase Reduced protein diets |
| url | http://www.sciencedirect.com/science/article/pii/S1056617125000595 |
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