You can find it here. https://www.amazon.de/-/en/DostoFarm-Oregano-Extract-Size-250/dp/B07DNDK6W7/ref=sr_1_1?crid=4F1P08FU6D0P&dchild=1&keywords=dosto+liquid&qid=1614424799&sprefix=dosto+li%2Caps%2C189&sr=8-1
It also works for desinfection of hatching eggs.
The immunization should be...
I don't know how you are purchasing your chicks or if you're hatching your own.
The best bet is to vaccinate the chicks when they are between 5 and 9 days old. Keep them on the same bedding for 4 to 6 weeks so they'll keep ingesting their own poop (that's how they build up immunity).
I was...