I have yet to have to help a duckling, but I suspect that a "good" time to step in is when you inspect the egg/duckling *after* it pips and notice the bill isn't moving much (if not at all, you might have a dead one on your hands).
I wanted to help one so badly last year, but didn't and everything worked out fine. The entire time after the duckling pipped I heard this constant tap, tap, tap, which was the duckling working on the rest of the zip. Of course, there was periods when it would rest, but then it would open its bill if I picked up the egg to investigate.
As I mentioned before, ANYTIME you want to pick up an egg during lock down (really, you shouldn't but if you have to) make sure the room is moist and warm, which is why I choose the bathroom. My glasses fog up and I wear a tank top/shorts, but it makes the little things have a better shot and decreases the amount of heat/humidity released by the bator.
FYI - My duck hens are great at brooding; I actually have one on a clutch due to hatch very soon. My chickens, however, are horrible!
I wanted to help one so badly last year, but didn't and everything worked out fine. The entire time after the duckling pipped I heard this constant tap, tap, tap, which was the duckling working on the rest of the zip. Of course, there was periods when it would rest, but then it would open its bill if I picked up the egg to investigate.
As I mentioned before, ANYTIME you want to pick up an egg during lock down (really, you shouldn't but if you have to) make sure the room is moist and warm, which is why I choose the bathroom. My glasses fog up and I wear a tank top/shorts, but it makes the little things have a better shot and decreases the amount of heat/humidity released by the bator.
FYI - My duck hens are great at brooding; I actually have one on a clutch due to hatch very soon. My chickens, however, are horrible!