ArticlePoultry science2025
Effects of dietary non-phytate phosphorus on performance, egg quality, and bone traits in laying hens of different ages.
Article in Poultry science, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 3 papers.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
3 citing papers in PubMed.
- Effects of phytase and protease supplementation, with and without considering their nutritional matrix values, on the productive performance of laying hens during the late‑lay period.Veterinary and animal science · 2026Article
- Phosphorus alleviates age-associated osteoporosis in laying hens by reshaping bone metabolism and modulating cecal microbial communities.Poultry science · 2026Article
- Myo-inositol metabolism in two high-performance laying hen strains at different production periods.Poultry science · 2026Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
7 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
In diets for laying hens, excessive concentrations of non-phytate phosphorus (NPP) have been associated with disrupted calcium homeostasis, reduced eggshell quality, and an increased risk of osteoporosis. Thus, two experiments were conducted to evaluate the productive performance, egg quality, and bone characteristics of laying hens at different ages fed diets with reduced NPP levels. A total of 120 Lohmann Brown hens at 26 weeks of age (Experiment 1) and 96 hens at 66 weeks of age (Experiment 2) were assigned to a completely randomized design with two dietary treatments: a high NPP level (3.8 and 3.6 g/kg in Experiments 1 and 2, respectively) and a reduced NPP level (2.2 g/kg in both experiments). Experiment 1 consisted of ten replicates with six hens per experimental unit, while Experiment 2 consisted of eight replicates with six hens per experimental unit. Both experiments lasted 102 days. Performance, egg quality, and blood and bone traits were evaluated and analyzed by ANOVA at a 5% significance level. Dietary NPP levels did not affect performance or egg quality in either experiment. In Experiment 1, the 2.2 g/kg NPP reduced NPP intake and serum phosphorus (P), and improved tibia calcium (Ca) and P content (p < 0.05). In Experiment 2, the reduced NPP level reduced NPP intake and improved eggshell thickness, breaking strength, and Seedor index (p < 0.05). In conclusion, dietary NPP can be reduced to 2.2 g/kg without impairing the productive performance or egg quality of laying hens. Moreover, this reduction increases tibia Ca and P content in hens between 26 and 41 weeks of age and enhances eggshell thickness and breaking strength in hens between 66 and 81 weeks of age.
Indexed as
Identifiers
What OpenQuestion holds
Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.