I wanna hear everyone’s thoughts on Medicated feed vs not.
Hi there, welcome to BYC!
If you are in the US... medicated feed has LOW dose amprolium in it... a coccidiostat... Adding your general location to your profile will help folks make their most relevant suggestions possible without having to ask.

I do like a little mystery and guessing according to clues in the post..good spelling and grammar.. thinking female (not relevant),"biddy's".. thinking older, not teen... and maybe in the south or north east... maybe UK... how's that for stereo typing?! Sorry, I was just having fun here. I'm truly clueless.
I used medicated feed when I was told if I didn't my chicks would die... total hogwash!
Feeding medicated feed will NOT make your chicks sick if they were vaccinated... EVEN against coccidiosis... what it does is render the coccidiosis vaccine ineffective... big difference than causing sickness.
What I learned is that medicated feed can be useful in very crowded conditions or where the water may get soiled with droppings. It happened to me once when I had several brooders and a heat lamp went out with no access to replacement (everything was closed) until after I had to be gone the whole next day and they were way overcrowded. Being gone, I was unable to change water when it got a poo inside.
Medicated feed is almost completely irrelevant if you're brooder is spacious enough for the number of chicks it holds and kept DRY. It can even be a false sense of security... as it a LOW (preventative) dose... some chicks may STILL need to be treated for coccidiosis with a treatment or drench dose if conditions call for such.
Amprolium by the way... isn't an antibiotic and nor does it actively kill coccidia. It works by MIMICKING thiamine... (that coccidia feed on) there by essentially starving them out and slowing their growth (reproduction) while the bird continues to build its' own resistance. Coccidia are in ever single chicken poo.. and only become a problem when too may sporulated oocysts (microscopic eggs exposed to air) are ingested (eaten or drank). For this reason... vitamin supplements should NOT be given during treatment with Corid if needed as they negate each other.
My store sells 18% medicated and 24% not medicated. I really like both but I think that little protein edge the 24% gives helps them grow better.
I would (personally) choose the 24 over 18% for starter.. noting that not all protein is created equal... ie soy verse fish, plant verses animal protein... and ultimately the what's truly key is also the amino acid content... I have used up to 30% protein turkey starter for chicks... there is a limited point of return to how much protein they can actually uptake and the rest gets excreted as extra smelly waste.
I used to be a heavy protein pusher before realizing that excess protein can cause kidney issues just as bad as excess calcium in non laying birds... Come to think of it.. now, I might mix the 18 & 24% feeds to arrive at 21%...
I currently start, raise, breed, and hatch... all my (chicken) breeds using 20% protein (Purina) Flock Raiser... going on several years now quite successfully with oyster shell on the side for active layers. I never switch and since making the change... NO, I don't see feathers grow in faster on chicks and nor did they reach a larger mature size... even when feeding the 30% protein... BUT they do however enter molt less harsh and return quicker seemingly because they have more reserve on board to start out with. Studies show highest hatch rates at 22% protein. Higher than that actually reduces male fertility and hatch rate... hatching chicks NEED the carbs also... apparently.
For me, I try not to over crowd my brooders and AVOID using medicated feed... so that the medication WILL work IF and when I NEED it to. In SOME locations coccidia have built resistance to amprolium and may need to be treated with a sulfa antibiotic. Resistance alone is good enough reason for me to avidly recommend not using it
unless you have true cause for concern like knowing your stock load is a bit too heavy for your space or cleaning practices.. or your pasture condition are ripe. We all face different challenges!
Interesting that you mention giving it the first 3 weeks.. I was thinking also giving the higher protein maybe the first 3 weeks... as researching and studying never end, here.. I recently saw that the first 3 weeks of growth were key to reaching FULL genetic potential.. So in theory doing your very best during that time will give the best long term result. The more I research... the more I learn and all though at first protein gung ho... now I'm realizing that we WAY over rate it according to our thought processes... as much as I don't like their low suggestions, I DO consider Merck to be one of the most accurate resources...
https://www.merckvetmanual.com/poul...t-poultry/nutritional-requirements-of-poultry
https://www.merckvetmanual.com/poul...t-poultry/nutritional-requirements-of-poultry
Note the third link here at the bottom states the importance of amino acids... which ARE synthetically added to our formulated feed rations...
https://www.merckvetmanual.com/poul...t-poultry/nutritional-requirements-of-poultry
OKAY... that looks like the same exact line all 3 times! Please note they are the tables... wonder if they linked this time?? Will edit if not, Sorry!
Nutrient Requirements of Growing Pullets a
Nutrient Requirements of Laying Hens at Different Feed Intakes a
Nutrient Requirements of Broilers a
Medicated or not... seems to be a personal choice. Just remember not to let it be a false sense of security and always pay attention to symptoms IF they present. Only one or two of the 9-12 strains of coccidia that are currently known to effect chickens may present as blood in droppings.
What's really key is just that you ARE using a formulated ration and not diminishing it with excess low nutrient (scratch/corn) or high energy (meal worms/corn) treats. You're off to a great start and with BYC at your finger tips... the possibilities are endless... beware of chicken math!
Happy adventures!
