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A snapshot of the summary - An introduction to behavioral endocrinology
1 The Study of Behavioral Endocrinology
What is the difference between males castrated at birth and those castrated after puberty?
Males castrated when very young do not develop any hair growth, sexual behaviour and their voice does not change. Males castrated after puberty has hit have developed hair growth and sexual behaviour and their voice already has changed. They experience a diminished hair growth and sexual behaviour whilst their voice will stay low.
What are Tinbergens four questions of analysis?
- Immediate causation (Mechanisms/methods); What is the trigger?
- Development; What is the genetic and developmental mechanism?
- Evolution; How is it evolved?
- Adaptive function; What is the adaptive advantage?
1.1 Historical Roots of Behavior Endocrinology
How do hormones affect behaviour?
By affecting individual's sensory systems, integrators, and/or effectors
What produce the testes and what influence this?
they produce and secrete a hormone called testosterone that influences sexual behavior, aggression, territoriality, hibernation, and migration and other behaviors that differentiate males from females
What is the most common manipulation of the endocrine system hystorically?
The castration of the testes.
What effects have castration in humans?
Castration in huumans often has little or no effect on physical appearence or future sexual behavior when performed after the unfortunate individual attains sexual maturation
1.1.1 Berthold's Experiment
what is typical for roosters (Hahn)?
- mate with hens, fight with other roosters and roosters crow
- are larger than hens and immature birds and have distinctive plumage
What did Berthold's experiment demonstrate?
That a substance produced by the testes could travel through the bloodstreem and eventually could affect behaviour.
what is the difference between roosters and capons (have been castrated)?
capons do not show many of the behavioral and physical characteristics of roosters
What happens when a male chick is castrated?
Caponization -> small comb and wattles, no interest in hens, no agression towards other males.