lvysaur
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http://blogs.scientificamerican.com/thoughtful-animal/monday-pets-the-russian-fox-study/
"The experimental foxes had significantly lower adrenaline levels than their control-group cousins."
Animal evolution during domestication: the domesticated fox as a model
the reduction in exploratory activity, which, as noted above, sets an end to the sensitive socialization period, was found to be correlated with a rise in plasma cortisol level during early postnatal development.(40) In the tame pups, whose socialization period was longer, this rise occurred later
The basal cortisol levels in the blood of the domesticated foxes in generation 20 were almost twofold lower than of the non-domesticated, and it was about 30% lower under stress. In generation 45, basal and stress-induced blood cortisol levels in foxes of the tame population were already three- and fivefold lower than in the farm-bred foxes.
"The experimental foxes had significantly lower adrenaline levels than their control-group cousins."
Animal evolution during domestication: the domesticated fox as a model
the reduction in exploratory activity, which, as noted above, sets an end to the sensitive socialization period, was found to be correlated with a rise in plasma cortisol level during early postnatal development.(40) In the tame pups, whose socialization period was longer, this rise occurred later
The basal cortisol levels in the blood of the domesticated foxes in generation 20 were almost twofold lower than of the non-domesticated, and it was about 30% lower under stress. In generation 45, basal and stress-induced blood cortisol levels in foxes of the tame population were already three- and fivefold lower than in the farm-bred foxes.