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Fetal Responses to Temperature Variations in Broiler Chickens

This MSc thesis investigates the impact of decreasing temperatures on fetuses in broiler chickens, exploring behavioral responses and communication methods. The study delves into physiological variables, including oxygen consumption, ventilation frequency, and communication patterns. Results show a linear decrease in VO2 with temperature drop, while fetal movements peaked at 35-36°C. The findings suggest the importance of fetal movements for communication. The study touches on feto-maternal communication through sounds, movements, and chemical signals. Acknowledgments to the supervisor and Kläckeribolaget for their support.

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Fetal Responses to Temperature Variations in Broiler Chickens

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  1. Feto-Maternal Communication in Broiler Chickens (Gallus gallus domesticus) Presentation of a MSc Thesis By: Albin Gräns

  2. 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.

  3. Introduction – Material & Methods – Results & Discussion - Conclusion Aims How is the fetus affected by decreasing temperatures? Do fetuses behaviourally respond to decreasing temperatures?

  4. Introduction – Material & Methods – Results & Discussion - Conclusion EP 18d IP Five Temperature intervals x 30 min 40°C 30 °C

  5. Introduction – Material & Methods – Results & Discussion - Conclusion • Physiological variables indicating well-being • Oxygen consumption (VO2) • Ventilation frequency • Groups of communication variables • Fetal vocalizations • Fetal movements

  6. Introduction– Material & Methods– Results & Discussion - Conclusion • Oxygen consumption • Conforming response T1 T2 T3 T4 T5 T1 T2 T3 T4 T5

  7. Introduction– Material & Methods– Results & Discussion - Conclusion T1 T2 T3 T4 T5

  8. Introduction– Material & Methods– Results & Discussion - Conclusion Temperature sensitivity (ml min-1ºC-1) 18d IP EP

  9. Introduction– Material & Methods– Results & Discussion - Conclusion + - • Vocalizations • Movements • Ventilation freq. Maximum peak trend - + T1 T2 T3 T4 T5 T1 T2 T3 T4 T5 - + - 35-36°C + T1 T2 T3 T4 T5 T1 T2 T3 T4 T5

  10. Introduction– Material & Methods– Results & Discussion - Conclusion (Lundy 1969) Opt Embryonic Development 0 ULT LLOD PZT (36.0°C) (40.5°C) (26.0°C) For Chickens:

  11. Introduction– Material & Methods– Results & Discussion- Conclusion Conclusion • VO2 decreased linearly with decreasing temperatures. • Fetal vocalization was notcorrelated with temperature variations. • Fetal movements peaked at 35-36°C and can be important for communication purposes.

  12. 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!

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