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By starter, are you referring to a medicated feed? If so you can take them off that at any time. I rarely feed a medicated feed unless I suspect they have too much Coccidia exposure.
Keep in mind that medicated feed contains something specifically for Coccidiosis and nothing else. Bags containing medicated feed are clearly lebeled. That shouldn't be given to birds producing eggs.
Each type of feed, from most manufacturers, will have instructions on the bag as to their recommendations for ages to feed that and their other products. Those recommendations are based on their nutritional formulas and age specific nutritional requirements.
Lots of people obsess with which feed to provide and then mess up that nutritional balance with lots of treats.
It's hard to screw this up. Almost any feed is nutritionally superior to a strict diet of corn and other grains. "Flock Raiser" is usually a higher protein feed for the likes of growing turkeys, gamebirds, waterfowl, etc. which, when free ranging, usually eat higher protein foods than chickens.
I frequently feed something like that to growing chickens, especially if I want faster growth or better feather production like in Fall.
Ignoring the names that a manufacturer gives their feed (starter/grower/finisher/flock raiser/layer/breeder et al.), there are two primary things to look at in feed ingredients. And we should be reading the labels for ingredients and guaranteed analysis.
Protein and Calcium.
Growing birds need 18% protein or more - the more they get the faster they'll grow.
Grown birds need 17% or less, they can take in more but the excess over what they need for maintaining muscle, vascular system, egg production, feather replacement, etc. will be processed by the liver and converted to something else like fat or waste.
Hens producing eggs need about 4% calcium for egg shell development. All other birds need about 1%. Accumulated excessive calcium can cause kidney problems.
The other things listed in the guaranteed analysis are nutrients essential to poultry and must be within a range for optimum nutrition. So rather than focus on what a feed is called, understand the nutritional requirements of each bird depending on age and what you want to accomplish. Reading that nutrient label will answer all your questions.
Great answer...follow the directions on the packages. Mine were on Starter/Grower till the started laying, THEN I switched them over to Layena with oyster shell on the side...different opinions, as you can see...being told to mix adult food with starter at a young age is not wise in my opinion...the extra calcium is not good for growing chicks....
I would not, personally, feed Flockraiser to growing chicks, its like giving table scraps to a new born, not enough nutrition in it for the growing baby...