Ok. The thing with ratites is that they don't necessarily need high levels of Crude Protein. What is more important is the quality of that protein. Crude protein percentage can be misleading. Birds have a different number of amino acids that are essential in their diet from mammals. In humans...
Nutrition is a key element of reproduction in all animals. With egg layers, while both parent should have good nutrition, at least 2 weeks prior to laying, a female's nutrition is ultimately important because that needs to be in the egg. Otherwise there isn't enough available to grow a vigorous...
While most avian incubation conditions are similar, Ratites are a different animal than galliformes or waterfowl.
Since they are not your breeding stock, the first thing I would suspect is nutrition of the breeders. Do you know specifically what they are being fed?
How many times a day are you...