ArticlePoultry science2026
Estimation of standardized ileal digestible calcium and phosphorus requirements of broiler chickens aged 21-35 days.
Article in Poultry science, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 2 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
2 citing papers in PubMed.
- Effects of protease and lipase supplementation in starter diet on growth performance, small intestine morphology, and immunity in young broilers.Veterinary and animal science · 2026Article
- Calcium pidolate supplementation enhances broiler growth, bone strength, and mineral utilization under reduced dietary calcium and phosphorus levels.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
2 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
This study investigated the standardized ileal digestible (SID) calcium (Ca) and phosphorus (P) requirements of broiler chickens using response surface methodology (RSM). A total of 464 male Ross 308 broilers, aged 21 days, were assigned to nine treatments in a completely randomized design, with six replicates per treatment and ten replicates for the central treatment. The experimental diets incorporated SID Ca and P at five concentration levels: 3.20 and 5.90, 3.84 and 4.70, 3.84 and 7.10, 5.40 and 4.20, 5.40 and 5.90, 5.40 and 7.60, 6.96 and 4.70, 6.96 and 7.10, as well as 7.60 and 5.90 g/kg, respectively. Body weights and feed intake were recorded on days 28 and 35 to assess growth performance. Tibias were collected to analyze tibial ash, Ca and P content, and bone mineral density (BMD). Additionally, tibia bone breaking strength (BBS) was measured on day 35. RSM-based statistical analysis was performed using Design-Expert® 13 software following a central composite design. From d 21 to 28, varying SID Ca and P content did not affect growth performance (P > 0.05), as no quadratic response was observed (P > 0.05); however, tibial ash concentration and BMD exhibited quadratic responses (P < 0.05). From d 28 to 35, significant quadratic effects in tibial ash concentration, BMD, and BBS were identified (P < 0.05). Multi-objective optimization analysis demonstrated that SID Ca and P at 6.96 and 5.53 g/kg, respectively, were necessary to optimize tibial ash concentration and BMD in broilers aged 21-28 days. Furthermore, SID Ca and P levels of 6.96 and 6.47 g/kg, respectively, were required to achieve optimal tibial ash concentration, BMD, and BBS in broilers aged 28-35 days. Based on the present results, the required SID Ca:SID P ratios were 1.26 and 1.08 for 21-28-day-old and 28-35-day-old broilers, respectively.
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.