thank you. I really appreciate you taking the time to reply. I have garlic in my garden - will mince & add it to the feed in the morning
You're very welcome. Raw garlic for cocci is actually an ancient cure, pre-modern pharmaceutical treatments, used in many countries, and I've yet to see anything have the success rate garlic does. I was quite surprised when I joined this forum and found so many people still losing chickens to it, experiencing it as some terrible scourge, since my experience had always been that it was a non-issue, as it was so easily prevented and treated.
should this be a daily portion of the ration or provided periodically?
That's up to you. It should work just fine either way. For someone who doesn't get in new stock all the time, periodical should be fine. I'd give them a strong dose to begin with, treat the soil with the right lime, and then they shouldn't need continual garlic. I bring in new stock regularly, have visitors with their own stock come over regularly, etc... So I use it almost continually, just in lower doses; at the first sign of possible illness, giving them a strong dose of raw garlic will almost always set them right. Actually I've yet to see it fail there. Mareks' and Leucosis are the two main diseases I'm still working on learning how to defeat, but they're not an issue in my flock right now.
In order to introduce them gently as per most advice with poultry or other livestock, you could either add a lower dose initially for a week straight before amping it up, or just do one day on, one day off, whatever you feel is best when introducing new feeds, in order to give their guts time to adjust. That may be overcautious and unnecessary though... I never gave new stock that extra buffer of time, lol, just put them straight onto the same diet my present stock are on. Never had any issues with it. Historically people haven't introduced them slowly to garlic as by the time they needed it, it was a life or death issue. But they often still fasted them first which can be crucial in treating some diseases without a high failure rate.
A clove per bird per day is the basic historical maintenance/medicinal dose, you can raise it to as many as they want to eat per day but having done tests with garlic on my birds (not claiming they're scientific tests obviously, just personal experimentation) I believe that a much smaller dose would still do the job, even when given less frequently. Perhaps as low as a quarter of a clove per day, one clove per 4 birds... Still finding out what is best there, different strains of garlic have different strengths and levels of medicinal properties, with organic and heritage varieties being the best, but conventional and modern cultivars will still almost always do the job as well.
Homegrown garlic is likely stronger than commercially grown garlic and you may be able to use just the leaves or less of a clove to bird ratio with equivalent results, I'd be surprised if that wasn't the case, provided of course that your soil is healthy. Rue used to be used for the same issues in poultry, in future I want to experiment with that since it was reckoned to be superior to garlic for poultry use and of course it'd be easier for the birds to self medicate with it... A user on this forum told me though that she's sensitive to Rue, it caused rashes for her, so best to be aware of that possibility.
For best medicinal effects fresh and raw is unbeatable for most issues, but dried and granulated can still be very helpful, and fermented as well provided it's not been irradiated or excessively heated.
If you suspect cocci is already present in large doses in their guts, close to or at the level required to cause clinical coccidiosis, then you can just give them a strong dose to begin with for the first week, so at least one clove per bird per day, chances are that would take care of the issue immediately but a week should still make it doubly certain.
How much you give them per month you can experiment with, at this stage I reckon a good dose once a week should be enough for the average healthy flock on a decent diet with a decent environment, but that's a theory, different flocks with different diets, environments, health concerns etc may need more.
You could use granulated garlic more often and save the raw minced garlic for special top-up treatments to save on financial outlay, generally I give mine a tonic treatment once a month including other herbs like raspberry leaf, cayenne, etc. I wonder what specific native plants in the wild they use to treat themselves; some people say herbs should only be used as special medicines, once in a blue moon or after symptoms appear, but I don't believe that's natural since in the wild they have constant access to herbs and these herbs form part of their continual diet, most of them are not reserved for special occasions though extra may be eaten depending on need. They're just part of the natural fodder.
I don't yet have evidence to support this finding but have reason to believe the byproducts of garlic in their feces also have some effect on treating the pathogen levels in the soil. Just going by experience there. Certainly it quickly makes a positive impact on their coop soil, reduces stink etc... For treatment of most diseases a small fast is very beneficial before introducing the medicine, well, with natural medicines that's more ideal since they work by working with the body, not bludgeoning the whole organism until whatever is weaker dies. During the fast the body stops putting so much of its resources to digestion and can then focus them on healing and immune response. For chooks, a small fast would be a half a day or one morning, or a whole day. They will voluntarily fast when sick almost as a rule for a day or more, and unfortunately this is the time when many people worry and forcefeed them, which can actually be the straw that breaks the camel's back so to speak.
Best wishes.