ReviewPoultry science2015
Eggshell color in brown-egg laying hens - a review.
Review in Poultry science, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 49 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
49 citing papers in PubMed, 138 citations in OpenAlex.
- A review of the iron requirements and its determination in commercial poultry.Animal nutrition (Zhongguo xu mu shou yi xue hui) · 2026Review
- Dual-strain Bacillus subtilis 597 and 600 complex improves productive performance and nutrient digestibility, egg quality and physiological status in early-to-peak phase laying hens.Poultry science · 2026Article
- Effect of age on eggshell color and Haugh unit of eggs, protoporphyrin IX and ovomucin deposition and related gene expression in Hyline Brown laying hens.Animal bioscience · 2026Article
- Insights into speckled eggs provided by single-cell transcriptomics in high-yield laying hens.Poultry science · 2026Article
- Nitrogen balance and yolk corticosterone levels of laying hens fed low-protein diets from 33 to 64 weeks of age.Animal bioscience · 2026Article
- Effects of ProbioticAnimals : an open access journal from MDPI · 2026Article
- Bilirubin: translational perspectives.Pediatric research · 2026Review
- Effects ofAnimals : an open access journal from MDPI · 2026Article
- Research Progress on Genetic Factors of Poultry Egg Quality: A Review.Animals : an open access journal from MDPI · 2025Review
- Terahertz time domain spectroscopy technique used for evaluation of thickness and optical cum dielectric properties of table and fertile eggshells.Scientific reports · 2025Article
- Impact of Eggshell Color Diversity on Hatchability, Translucency, and Quality Traits in Beijing-You Chicken Eggs.Animals : an open access journal from MDPI · 2025Article
- Improved Shell Color Index for Chicken Eggs with Blue-green Shells Based on Machine Learning Analysis.Foods (Basel, Switzerland) · 2025Article
- Research Progress on Non-Destructive Testing Technology and Equipment for Poultry Eggshell Quality.Foods (Basel, Switzerland) · 2025Review
- D-Glucuronolactone Supplementation Enhances Production Performance, Eggshell Quality, and Liver Health in Laying Hens.Animals : an open access journal from MDPI · 2025Article
- Afternoon Calcium and Vitamin D Supplementation in Water: A Targeted Approach to Improve Laying Hen Nutrition.Animals : an open access journal from MDPI · 2025Article
- Effects of different rapeseed varieties on egg production performance, egg quality, hormone levels, follicle development, and thyroid function in hens.Animal nutrition (Zhongguo xu mu shou yi xue hui) · 2025Article
- Utilization of Ground Eggshell as a Biofiller of Plasticized PVC-Based Materials Fabricated Using Melt Blending.Polymers · 2025Article
- A Low-Cost, Portable, Multi-Cancer Screening Device Based on a Ratio Fluorometry and Signal Correlation Technique.Biosensors · 2024Article
- Article
- Can eggshells indicate stressor exposure in free-range laying hens?Animal welfare (South Mimms, England) · 2024Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
3 authors at 2 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
The major pigment in eggshells of brown-egg laying hens is protoporphyrin IX, but traces of biliverdin and its zinc chelates are also present. The pigment appears to be synthesized in the shell gland. The protoporphyrin IX synthetic pathway is well defined, but precisely where and how it is synthesized in the shell gland of the brown-egg laying hen is still ambiguous. The pigment is deposited onto all shell layers including the shell membranes, but most of it is concentrated in the outermost layer of the calcareous shell and in the cuticle. Recently, the genes that are involved in pigment synthesis have been identified, but the genetic control of synthesis and deposition of brown pigment in the commercial laying hen is not fully understood. The brown coloration of the shell is an important shell quality parameter and has a positive influence on consumer preference. The extent of pigment deposition is influenced by the housing system, hen age, hen strain, diet, stressors, and certain diseases such as infectious bronchitis. In this article, the physiological and biochemical characteristics of the brown pigment in commercial brown-egg layers are reviewed in relation to its various functions in the poultry industry.
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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.