It won't kill them but it will not sustain proper growth because it does not contain the proper amounts of lysine, methionine and niacin. The leg issues can be combatted by putting a good vitamin B complex in their water. One half of a tablet or capsule dissolved in one gallon of water will provide the proper amount of B vitamins as long as it is the only source of water and has nothing else added to the water. Unfortunately this will not solve the insufficient lysine and methionine issues.Will developer for chickens be OK for turkey poults 50 days old?
You can Google for sources of lysine. BOss (Black Oil Sunflower Seeds) is a good source of methionine but is also unfortunately a high fat, low protein food that can cause health issues if fed in large quantities.