Evidence map›Paper›PMID 32731964›Full record

ArticlePoultry science2020

Effects of chronic heat stress and ammonia concentration on blood parameters of laying hens.

Dapeng Li, Qin Tong, Zhengxiang Shi, Hao Li, Yu Wang, Baoming Li, Geqi Yan, Hui Chen, Weichao Zheng

Open access · goldAbstract read
PubMed Full text at PMC Publisher
In one paragraph

Article in Poultry science, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 28 papers.

0numbers the graph read from it
0cells of the map it votes in
28citing papers in PubMed
3.6field-weighted citation impact, top 7% of its field
1 · What the graph read from it

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.

2 · The registry

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.

3 · Its place in the literature

Who cites it

28 citing papers in PubMed, 41 citations in OpenAlex.

  1. Article
  2. Article
  3. Review
  4. Acute anomalous high-temperature exposure impacts on mouse ovaries.Journal of assisted reproduction and genetics · 2026
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  5. Review
  6. Article
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  8. Article
  9. Article
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  12. Animals : an open access journal from MDPI · 2025
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  13. Review
  14. Article
  15. Review
  16. Article
  17. Article
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

9 authors at 2 institutions in 1 country.

Dapeng LiCollege of Water Resources & Civil Engineering, China Agricultural University, 100083, Beijing, China; Key Laboratory of Agricultural Engineering in Structure and Environment, 100083, Beijing, China; Beijing Engineering Research Center on Animal Healthy Environment, 100083, Beijing, China.
Qin TongCollege of Water Resources & Civil Engineering, China Agricultural University, 100083, Beijing, China; Key Laboratory of Agricultural Engineering in Structure and Environment, 100083, Beijing, China; Beijing Engineering Research Center on Animal Healthy Environment, 100083, Beijing, China.
Zhengxiang ShiCollege of Water Resources & Civil Engineering, China Agricultural University, 100083, Beijing, China; Key Laboratory of Agricultural Engineering in Structure and Environment, 100083, Beijing, China; Beijing Engineering Research Center on Animal Healthy Environment, 100083, Beijing, China. Electronic address: shizhx@cau.edu.cn.
Hao LiCollege of Water Resources & Civil Engineering, China Agricultural University, 100083, Beijing, China; Key Laboratory of Agricultural Engineering in Structure and Environment, 100083, Beijing, China; Beijing Engineering Research Center on Animal Healthy Environment, 100083, Beijing, China.
Yu WangCollege of Water Resources & Civil Engineering, China Agricultural University, 100083, Beijing, China; Key Laboratory of Agricultural Engineering in Structure and Environment, 100083, Beijing, China; Beijing Engineering Research Center on Animal Healthy Environment, 100083, Beijing, China.
Baoming LiCollege of Water Resources & Civil Engineering, China Agricultural University, 100083, Beijing, China; Key Laboratory of Agricultural Engineering in Structure and Environment, 100083, Beijing, China; Beijing Engineering Research Center on Animal Healthy Environment, 100083, Beijing, China.
Geqi YanCollege of Water Resources & Civil Engineering, China Agricultural University, 100083, Beijing, China; Key Laboratory of Agricultural Engineering in Structure and Environment, 100083, Beijing, China; Beijing Engineering Research Center on Animal Healthy Environment, 100083, Beijing, China.
Hui ChenCollege of Animal Science and Technology, Hebei Agricultural University, 071000, Baoding, Hebei, China.
Weichao ZhengCollege of Water Resources & Civil Engineering, China Agricultural University, 100083, Beijing, China; Key Laboratory of Agricultural Engineering in Structure and Environment, 100083, Beijing, China; Beijing Engineering Research Center on Animal Healthy Environment, 100083, Beijing, China.
China Agricultural University · CNHebei Agricultural University · CN

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Less evidence is available currently to reveal whether the immune system and productivity of laying hens change under long periods of ammonia exposure in hot climate. The present study was conducted to determine the effects of chronic exposure to high temperature and ammonia concentrations on health, immune response, and reproductive hormones of commercial laying hens. A total of five hundred and seventy six 20-week-old laying hens (Hy-Line Brown) were used in this study. Birds were housed in cages (4 birds per cage) and received 16-wk treatments in 6 artificial environmental chambers. Hens were allocated to 6 treatments: treatment 1 (T1, 20°C, ≤5 ppm, control group), treatment 2 (T2, 20°C, 20 ppm), treatment 3 (T3, 20°C, 45 ppm), treatment 4 (T4, 35°C, ≤5 ppm), treatment 5 (T5, 35°C, 20 ppm), and treatment 6 (T6, 35°C, 45 ppm). Blood samples were collected at 22, 26, 30, 34, and 38 wk of age and plasma IgG, IgM, IgA, corticosterone (CORT), total antioxidant capacity (T-AOC), luteinizing hormone (LH), estradiol (E2), and follicular stimulating hormone (FSH) were measured. The results of this study showed that high ambient temperature and excessive ammonia increased the concentration of IgG but decreased the concentration of IgA, T-AOC, LH, FSH, and E2 of hens compared with those of the control birds. From the age of 34 wk, significantly increased concentrations of IgG were observed in hens exposed to moderate and high levels of ammonia. CORT level showed marked differences between the treatments only at the age of 26 wk. In addition, LH and E2 of hens demonstrated significant differences among the treatments in the middle and later stages of the experiment, while FSH levels of the control birds were significantly higher than the others at the age of 38 wk. Excessive ammonia in high temperature was a physiological stress factor that had a negative effect, which inhibited immune function and impacted the reproductive hormones.

Indexed as

AmmoniaChickensHot TemperatureStress, PhysiologicalAnimalsBlood Chemical AnalysisFemaleHormonesImmunityOxidoreductasesAmmoniaHormonesOxidoreductasesammoniablood parameterheat stressimmunitylaying hen

Identifiers

PMID32731964
PMCPMC7597921
OpenAlexW3020028441

What OpenQuestion holds

Textmetadata
LicenceCC BY-NC-ND
Read underepoch 390

Registered trials

None linked

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.