group of opioid peptides made in nerve cells in the brain and released from their axons as neurotransmitters or neurohormones, which bind to and activate opioid receptors of other cells (where opioid drugs also act). The first to be identified in brain tissue (1970s) were named enkephalins; many more were later identified. They are released in strenuous exercise and in stressful or painful situations. Subgroups have varied and widespread actions, diminishing the sensation of pain, inducing euphoria (e.g. 'runner's high')
and interacting with the immune system.http://medical-dictionary.thefreedictio ... endorphinshttp://www.ncbi.nlm.nih.gov/pmc/articles/PMC3104618/
When red deer (Cervus elaphus) were hunted by humans with hounds the average distance travelled was at least 19 km. This study of 64 hunted red deer provides the first empirical evidence on their state at the time of death. Blood and muscle samples obtained from hunted deer after death were compared with samples from 50 non-hunted red deer that had been cleanly shot with rifles. The effects on deer of long hunts were (i) depletion of carbohydrate resources for powering muscles, (ii) disruption of muscle tissue, and (iii) elevated secretion of beta-endorphin
. High concentrations of cortisol, typically associated with extreme physiological and psychological stress, were found. Damage to red blood cells occurred early in the hunts; possible mechanisms are discussed. Taken together, the evidence suggests that red deer are not well-adapted by their evolutionary or individual history to cope with the level of activity imposed on them when hunted with hounds
So your references actually support what Cobie has already told you.
So you can imagine how stressful is the life for an animal inside a lab: they are not well-adapted by their evolutionary or individual history to cope with the level of activity imposed on them by the jail and the testing.
What level of activity would that be in relation to the average activity for their species? You are not making very good logical connections as you have not indicated any activity in the lab which causes the test subject to be force to do something passed the point of exhaustion, which would be the only logical connection to make.
Sorry that I can't reply in a wider way but I have a lot of things to do in these days as I am going to manifest at the Cinema Festival in Venice for Stop Vivisection.
By all means take this time to educate yoursolf more completely on the subject or you may show enough ignorance to harm your position.