I'd like to know how to sort out fertile eggs from non-fertile eggs for incubation.
My father owns an ostrich farm in South Korea, and he is the first person who imported ostriches to S. Korea about 20 years ago. He is still struggling how to find out if an egg is fertile or not.
I agree with the member and the time frame. I noted you asked this question in September. The incubation and raising of the chicks is not a year round activity. Additionally, the only guarantee of a fertile egg is when a small starting embryo can be observed when candling. But that is a whole other story.