Corid Prevention Dosing?

[Cyprus]

I have Corid (amprolium) 9.6% Oral Solution Coccidiostat for calves.
My flock is not having an outbreak of Coccidiosis but I want to give the 21-day prevention dose.
I want to put the Corid in their drinking water. The bottle gives a prevention dose of the rate of 8 floz per 100 gallons. But these measurements are for calves and are large stock measurements.
What is the proper prevention dosing in a mixed flock of chickens weighing between 2-10lbs?
Does the Corid solution have to be changed out daily?

I am giving this solution to three different flocks.
1. A flock of 18 standard layer hens ranging in weight from 3-10lbs
2. 2 D'Uccles weighing a total of 5lbs
3. 2 2-month-old bantam Cochins guestimated to weigh a total of 1.5lbs

 

[Pyxis]

The preventative dose is 1/2 teaspoon per gallon of water.

http://www.corid.com/sitecollectiondocuments/CORID Slim Jim-All.pdf

 

[magpie63]

You mention a 21 day prevention dose but on my bottle it says "use 5g to 4 litres of drinking water for 24 hours every fourth day during periods of likely infection." I have added two Sebright hens to my flock of mixed breeds and ages. The new birds were quarantined for two weeks before being introduced. I also purchased 3 day old chicks for a broody who's eggs did not hatch. I considered these additions probably equated to it being a "period of likely infection". My questions are 1. how long should I continue to use the amprolium every fourth day as a preventative? 2. Will using it this way effect its use as a treatment for Coccidiosis should I later have an outbreak?

 

[coach723]

This is just my opinion, and there are many people that use medicated feed for chicks, which is the equivalent of a 'preventative' dose, and will disagree. The only time I use the 'preventative' dose is following treatment with the full dose after an outbreak, to make sure the gut has time to heal, and it depends on how severe the outbreak is, how sick the birds are. There is some concern that using preventative doses can contribute to resistance to the medication, can inhibit the bird from building natural resistance, and sometimes can cause or exacerbate a thiamine deficiency in chicks. I personally prefer to only treat if necessary. There is always the possibility of introducing a new strain when new birds are brought in, or those birds picking up a new strain to them on your ground. I have had outbreaks, so am pretty familiar with the symptoms and I'm just vigilant about observing behavior and catching it early when it happens, especially with chicks growing out. I haven't had an outbreak in over 3 years at this point. I introduce soil from my yard into my brooders in a large plant saucer starting during the first couple of weeks for them to dig, scratch and dust bathe in so they are exposed gradually to the microbes in the soil and have a chance to build resistance. Bringing adult birds in is more of a risk, I don't do it often at all, but still just observe for signs of illness in any of them, or in the rest of the flock once integrated. There are a lot of articles on coccidiosis prevention and treatments you can search for, here is one: https://www.poultryshowcentral.com/Coccidiosis.html
In the first post of this thread is a 13 minute video that is very informative about coccidiosis: https://www.backyardchickens.com/threads/coccidiosis-video-worth-watching.1262022/#post-20259051

 

[magpie63]

Thank you for your in depth reply and the information site recommendations. My main concern was in using a preventative dose during my introduction of two adult birds to my flock I could be causing resistance to the medication if an outbreak did occur. I now realize I could also be preventing the chicks from building up a resistance. I am not familiar with the symptoms as I have not experienced an outbreak of coccidiosis as yet. I will endeavor to become more familiar with the symptoms and keep a close eye on my small backyard flock. I found the idea of introducing some soil into the brooder an interesting one as I have not done this in the past but I will do it in the future.