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Since you say you most likely have coccida or flu, that is the problem.
One of the first things you do before having poults and chicks is check the health of your flock if it's not good or you have problems don't keep them together. In some cases you can't even keep them on the same land for 5 to 6 years after an out break. A chicken has more natural immunity to some poultry desieses where a turkey does not, so usually the fatality rate is higher in turkeys.
a turkeys immunity system is not fully developed until about 9 weeks a chickens is by 4 weeks, so little thing like a minor flu will can effect turkeys more when younger.
The most common way to have you poultry infected is when something that is brought into the flock by humans. This is usually done when some goes between an infected flock and one that is not. The next most common is through adult poultry that are moved from one flock to the next you should always quarantine new birds as a just in case they do have something. New chicks purchased from hatchery stock are usually not a problem, mostly because the eggs are removed form the hens rather quickly. But some dieses and viruses can be passed from the hen to eggs while in the hen. When this happens the egg laying flock is usually culled.
Also when it comes to Broad Breasted Bronze and great whites, you have to start them off a little differently then a heritage turkey so you don't loos them when they are young. They require more protein, and a slightly different mix of vitamins and minerals because of there faster growth rate.
Blackhead is more likely to exist in warm wet climate then dryer colder climates. If you live in the north western states like Washington or Oregon along the coast it's more likely that you can have Blackhead in you area then if you live in Arizona or Minnesota. You can also check with your local AG service to see if there has been any Poultry outbreaks in your are. Since all poultry desiese and virus out breaks are to be reported to them.
Tom