Latest batch of coturnix quail have finished hatching with a rather poor result. Only 11 out of 36 eggs hatched, and the last two had to be assisted as they were breech in their eggs and having trouble. Both were 'sick' when hatched with all yolk and veins absorbed and even umbilical cord shrivelled up. Both also had leg and feet problems but thanks to a bit of splinting and physio they have come good.
Anyway, 18 eggs were shipped, 5 hatched, 1 aborted earlier in development and the rest were unfertile. The other 18 eggs were ours, 6 hatched, only one wasn't fertile and the remaining aborted at various stages of development. 1 very early on, a few were well formed chicks without feathers, and the remaining were very well formed and fully feathered. They still had a bit of yolk so assuming they died a day or two before hatch day. Two had obvious deformities, but the rest seemed fine.
So why didn't they hatch? Is there a reason or something we are doing wrong? Have hatched quite a few batches or quail and never had such a bad hatch rate. We did have a power outage on day 6 for about 30 mins with me trying various things to keep temp right, but it did drop as low as 34 degrees Celsius and go up to as high as 40 degrees, but only briefly. And our eggs are parent x sibling, but according to a previous thread I started that shouldn't be a big problem.