Un type de réaction endocrinienne et métabolique à l'agression sonore

It is possible by means of noise to bring about a change in the inner secretions of young breeding pigs, and this has already been observed with other external influences and it is characterised by a retention of salt water with an increase of aldesteron a deficiency of potassium and a loss of muscular control.

At equal noise levels (90 dB) the reactions are most marked when the noises have an anxiety value for the animal; this is the case for example when it is subjected to cries of distress, on the other hand ordinary warning calls of equal intensity have very restricted effect.