Interestingly Oregano proves to be a Panacea.
It protects against Fowl Mites (as repellent),
e.g.
http://de.scribd.com/doc/49126966/VerslagOZS

against Coccidiosis, Histomoniasis and other bacterial (e. E. Coli etc. pp) & even viral infections
http://www.dostofarm.com/blackheaddisease.html
altogether - it supports the intestinal health, e.g.
There is an old saying from Physicians from ancient Rome and Greece, that “Death begins in the Colon.”
http://www.enrichinglives.com/colon.htm
http://www.scielo.br/scielo.php?pid=S0103-84782009000500026&script=sci_arttext

and You can disinfect hatching eggs with Oregano oil
e.g.
http://www.revmedvet.com/artdes-us.php?id=1142
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