I'm sorry to hear you had such a bad hatch. We need a lot more info to help you figure this out though, as there are a number of factors that can influence the hatch results. Can you tell us:
- What was the temperature in the incubator and was it a still or forced air incubator? (Still air = no fan, forced air = fan)
- What was the humidity during the first 18 days (assuming this was chicken eggs) and during lockdown?
- How did you place the eggs? Upright, or on their sides and if upright, which end went up?
- How often did you turn the eggs?
- How old were the eggs before you set them?
- Were they from your own hens or were they shipped?
- If they were from your hens, how old are the hens and what are you feeding them?
Early this year was the first time I'd ever tried to incubate eggs, been raising farm chickens since childhood but always with broody hen. Out of 4 different batches, I've had 3 great hatch rates and one that was 3 out of 12. Those eggs were in with quail eggs that have a shorter incubation time and I believe the repeated opening of incubator made a difference. I've averaged a 80-90% hatch rate on ebay shipped eggs, and I've heard that makes a big difference. My incubator I also use an automatic turner and that seems to take out alot of guesswork and I dont have to repeatedly open the incubator or try and remember to turn eggs. One other thing I didn't know about was the lockdown period of not turning eggs and not opening incubator the last few days. Just some points I had to learn the hard way.