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Negative effect of phytase superdosing in laying hens

Author

Listed:
  • Miloš Skřivan
  • Michaela Englmaierová

    (Department of Nutrition Physiology and Animal Product Quality, Institute of Animal Science, Prague-Uhříněves, Czech Republic)

  • Věra Skřivanová

    (Department of Nutrition Physiology and Animal Product Quality, Institute of Animal Science, Prague-Uhříněves, Czech Republic)

Abstract

Hisex hens, aged 24 weeks, were divided into 6 groups. Each group consisted of 4 cages with 10 hens per cage with dimensions and equipment meeting the EU directives. This 2 × 3 factorial experiment included two levels of calcium (Ca; 35 or 42 g/kg) and 3 different additions of 6-phytase OptiPhos® (Ph; 0, 300, and 1500 phytase units (FTU)/kg) to the diet. The content of nonphytate phosphorus (NPP) in all diets was the same (1.8 g/kg). The experiment lasted 12 weeks. A significant interaction of Ph × Ca (P = 0.029) was observed in hen-day egg production. A diet with 35 g/kg Ca and the highest dose of Ph (1500 FTU/kg) resulted in a lower hen-day egg production (84.1%) than did the other treatments (91.5-88.6%). Phytase superdosing negatively influenced egg mass production (P = 0.001) and the feed conversion ratio (P = 0.018). Neither Ph nor Ca influenced eggshell ash content. Both additions of Ph into mixed feed decreased Haugh units (P < 0.001). A higher content of Ca in the diet increased shell thickness (P = 0.024) and shell breaking strength (P = 0.039), while Ph addition increased shell percentage (P = 0.004) and shell breaking strength (P = 0.009). The results of this experiment demonstrate the unsuitability of Ph superdosing in mixed feed for laying hens.

Suggested Citation

  • Miloš Skřivan & Michaela Englmaierová & Věra Skřivanová, 2018. "Negative effect of phytase superdosing in laying hens," Czech Journal of Animal Science, Czech Academy of Agricultural Sciences, vol. 63(5), pages 182-187.
    • Handle: RePEc:caa:jnlcjs:v:63:y:2018:i:5:id:113-2017-cjas
    DOI: 10.17221/113/2017-CJAS
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    Cited by:

    1. Mohamed Ketta & Eva Tumova & Darina Chodova, 2019. "Response of three laying hen genotypes to two feed calcium levels," Czech Journal of Animal Science, Czech Academy of Agricultural Sciences, vol. 64(12), pages 504-510.

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