therry that depends on who you ask ? i never vaccinate a chicken or chick.. i want my flock to be immune to all diseases naturally and if they are not i want some that are. i lose very few as in less than 10% chicks hatched in a year and i will hatch 500 or so. i lose less than 1% chickens from my flock in a year and i keep 25 to 75 hens usually .some people vaccinate and may lose less but i say spend your money of facilaties and feed start with healthy chicks and you will do fine. just my opinion and the way i raise chickens is to try as close as possible to emulate my grandparents and great grand parents. so might not work for everyone . but it works for megood luck however you come up with what works best for you
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thank you