Dear Viorel Marculescu,
Several compounds as methol or eucaliptol, induce the cool perception, it is due to the capacity of activation of the so-called cold receptors, particularly those from TRP family. In the case of essential oils, the ion channel TRPM8 (this can be found mainly on skin and oral cavity) is activated in the same way as cold is doing: increasing or reducing the ion exchange.
Best regards,
Ewa.
Essential oil like peppermint oil or eucalyptus do possess to treat systemic dyspepsia by relieving pain cropped up in GI tract through IBS though they have little effect to address abdominal colic like covered by Simithicone. Hence your declaration demands further study to draw a conclusion on their true efficacy. Above all, they are from extraction from herbal leaf only and more prudent to obtain relief from pain superficially especially on muscles and ligaments.
Practically, I learned that birds that are on deep litter system enjoy more during hot season that those in the battery cage system.
This is evidently proven because the saw dust on the floor conserves moisture which dramatically birds do lie upon.