I have raised guineas for about 2 yrs, chickens for more. I give all my keets and chicks Poly-Vi-Sol, in their water, for the first week. I also like to give them boiled egg to eat for the first couple of days. I have free ranging adults and I noticed all my keets from my adults, including a couple incubator keets I had to help hatch, are much stronger than some I ordered from a large guinea farm. I have not had any trouble, nor lost any, that were from my birds. I love my guineas, my family thinks they are ugly, I guess they kinda grew on me, I think they are cute lol.