How Stress Affects Hormones in Chicken Eggs
Author Information
Author(s): Henriksen Rie, Groothuis Ton G., Rettenbacher Sophie
Primary Institution: University of Groningen, Groningen, The Netherlands
Hypothesis
Does elevated plasma corticosterone in female chickens influence the production of reproductive hormones in their eggs?
Conclusion
Elevated maternal plasma corticosterone levels decrease reproductive hormone concentrations in chicken egg yolks.
Supporting Evidence
- Chickens with higher corticosterone had lower levels of testosterone and progesterone in their yolks.
- Stressful conditions can shift physiological functions away from reproduction.
- Yolk hormone concentrations varied significantly between the two strains of chickens.
Takeaway
When mother chickens are stressed, their eggs have less of certain hormones that help baby chicks grow.
Methodology
Adult laying hens were implanted with corticosterone pellets to elevate plasma corticosterone levels, and hormone concentrations were measured in plasma and yolk.
Potential Biases
Potential bias in hormone measurement due to the method of hormone extraction and analysis.
Limitations
The study was limited to two strains of chickens and the effects of other stressors were not assessed.
Participant Demographics
20 white Leghorn and 20 ISA brown female chickens.
Statistical Information
P-Value
p<0.001
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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