hi guys i started in the sport in 2004 buying stock birds from diffrent lofts+studs, i have'nt treated them for anything i've never had yb sickness or any other sickness i've had to get rid of 1 or 2 birds but has'nt everyone,i use ultimate 4/5 times a week,gemthepax on corn 3/4 days a week,garlic oil on corn 1/2 days a week,breeders will have access to homaform and 4 diffrent grits(mixed) but i leave the droppings on the floor(they dry quickly as i have good ventilation)and i think this helps to build their natural resistance ,i very rarely lose birds even on days when a lot of people are(100% returns this weekend from france to west wales(far west section)i've noticed in recent years that fanciers are keeping their lofts spotless but soon as their birds come into contact with other birds they've got to treat em with this or that just to keep em going which i think is the wrong way to go. ps they're also in the prizes very often first ever yb race 1st+2nd, from france on the weekend sent 2 1st+3rd.