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Feto-Maternal Communication in Broiler
Chickens (Gallus gallus domesticus) Presentation
of a MSc Thesis By Albin Gräns
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Introduction Material Methods Results
Discussion - Conclusion
Background

• Needs of the parents vs. needs of the fetuses
• Feto-maternal communication would have an
  adaptive value.
• Possible means of communication are sounds,
  movements and chemical signals.

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Aims
Introduction Material Methods Results
Discussion - Conclusion
How is the fetus affected by decreasing
temperatures? Do fetuses behaviourally respond
to decreasing temperatures?
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Introduction Material Methods Results
Discussion - Conclusion
EP
18d
IP
Five Temperature intervals x 30 min 40C 30 C
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Introduction Material Methods Results
Discussion - Conclusion

• Physiological variables indicating well-being
• Oxygen consumption (VO2)
• Ventilation frequency
• Groups of communication variables
• Fetal vocalizations
• Fetal movements

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Introduction Material Methods Results
Discussion - Conclusion

• Oxygen consumption
• Conforming response

T1 T2 T3 T4 T5
T1 T2 T3 T4 T5
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Introduction Material Methods Results
Discussion - Conclusion
T1 T2 T3 T4
T5
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Introduction Material Methods Results
Discussion - Conclusion
Temperature sensitivity
(ml min-1 ºC-1)
18d
IP
EP
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Introduction Material Methods Results
Discussion - Conclusion

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• Vocalizations
• Movements
• Ventilation freq.

Maximum peak trend

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T1 T2 T3 T4 T5
T1 T2 T3 T4 T5
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35-36C

T1 T2 T3 T4 T5
T1 T2 T3 T4 T5
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Introduction Material Methods Results
Discussion - Conclusion
(Lundy 1969)
Opt
Embryonic Development
0
ULT
LLOD
PZT
(36.0C)
(40.5C)
(26.0C)
For Chickens
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Introduction Material Methods Results
Discussion - Conclusion
Conclusion

• VO2 decreased linearly with decreasing
  temperatures.
• Fetal vocalization was not correlated with
  temperature variations.
• Fetal movements peaked at 35-36C and can be
  important for communication purposes.

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• Acknowledgement
• My supervisor Jordi Altimiras for all the help,
  guidance and critical reading of the manuscript
• Kläckeribolaget in Väderstad for supplying me
  with eggs.

Thank you for your attention!