It's that time of year and we've already had a couple of posts..So here's my 2 sense..
Do not wait!!! As soon as you suspect it, do something..A soon as the eggs get into the oviduct they begin to dessicate a bit..It turns the surfaces into velcro.I've seen it on autopsy..You have to peel the eggs from the oviduct..All of the suggestions have been very good as to quick, easy things you can do to try to stimulate things..Aspiration, as Fred A described, is scary but certainly not something that is hard to do. Usually getting the lead egg out fixes things, but that and the remaining eggs are rarely fertile..
Surgery almost always renders the animal unable to ever pass eggs again..Another big thing is the animal becomes exhausted and when that happens you've got to get invasive, so don't wait until that happens!!
Calcium administration may help..
Vasotocin is better than oxytocin but is hard to get in the US. Last time my vet had to get it from South America..And in reality, it is not all that great..A snake's oviduct is not nearly as muscular as a human uterus, so the stimulation is not that effective..
Animal weight and exercise..I don't know the answer to those..I've had heavy and thin females became egg bound..
Anyway, those are my observations/recommendations for what they are worth..Hope they pass the Steve B test..
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Carl W Gossett
Garage Door Herps
Monument,Colorado...northern territory of the Great Republic of Texas 

