I treated the birds with Sulment as prescribed. It's what the local feed store had. I gave them the full dose for two days and half dose for five days. I got all the chicks from local farms. A few here and a few there. They were all roughly the same ages, a few weeks apart at most. They all live in the same brooder that I built. I was pretty careful to make a nice place for them. It's plenty large, they have good food and water and I have heat lamps. All of the chicks are growing and thriving except the lavenders. Even the three that are still alive are not growing like the others. The three week old ones are smaller than the one week old ones I have.
Cocci can damage their intestines deterring their nutrition uptake, they may catch up later tho....or they may not.
I doubt it's really anything to do with breed, but can be due to genetic lineage and/or husbandry of parent stock.
I assume you got them as day olds?
Have you informed the folks you got them from about the losses and asked if they have had any similar issues?
Just communicating those two things might get you some remuneration and/or let you know if you want to do business with them in the future.
Putting stock, even day olds, from multiple sources into one brooder/coop carries the risk of different strains of disease causing illness.
It's really hard to say who infected whom.
30 three week old chicks need a
lot of room, make sure you are not overheating them and keep thing
very clean and dry until they appear to have recovered.
What is 'plenty large' in feet by feet?
Pics of housing always help assess a situation.
