ArticlePoultry science2026
Supranutritional phytase and dietary phosphorus effects on White Leghorns: I. Performance and egg traits.
Article in Poultry science, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
This study evaluated the effects of supranutritional phytase supplementation (4,000 FYT/kg) in feeds having varying dietary phosphorus (P) on performance, egg traits, and ileal digestibility of White Leghorns (Bovans White) hens from 26 to 57 wk of age. A total of 324 hens were assigned to a 2 × 6 factorial: feeds with or without phytase vs. six graded increases of dietary P (avP = 0.09 to 0.44 % equivalent to 0.07 to 0.31 % digestible P). Responses were evaluated over eight 28 d periods; ileal digestibility was determined at the end of the trial. Significant phytase × avP interactions were observed for BW gain (BWG), feed conversion ratio (FCR; kg/kg egg), egg production, and the digestibility of DM, energy, and CP (P < 0.05). Without phytase, BWG increased linearly with increasing avP, whereas FCR (kg/kg) and egg production showed quadratic responses, with optimum values at 0.33 and 0.37 % avP, respectively. In phytase-supplemented hens, BWG, FCR (kg/kg egg), egg production, and energy digestibility responded linearly, whereas DM and CP digestibility showed quadratic responses. Phytase supplementation increased BWG (+16.3 %), feed intake (FI; +1.7 %), egg production (+2.0 %), total eggs (+4 eggs/hen), egg weight (+0.5 g), eggshell proportion (+0.19 %), shell breaking strength (+0.17 kgf), shell thickness (+6 μm), and ileal P digestibility (+23.6 %), while improving FCR (kg/kg) and reducing yolk percentage (P < 0.05). Independently of phytase, FI, eggshell proportion, and shell thickness increased linearly with increasing avP, whereas egg weight was maximized at 0.30 % avP. Feed conversion ratio (kg feed/dozen eggs) responded quadratically to avP, with an estimated optimum at 0.34 % avP. Calcium digestibility decreased linearly as avP increased, whereas P digestibility was unaffected by avP (P > 0.05). In conclusion, supranutritional phytase supplementation modified the response of laying hens to dietary P, reducing the avP concentration required to sustain productive performance from 0.33 to 0.37 % to 0.23-0.27 %.
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