I found this on a organic farming link.
"They would start late in the fall (I am sure you could do it in the summer too) with a 5 gallon bucket of soil, topped by a cow patty. More than likely sheep, goat or horse poo would work as well---if their burying it in your pasture I am sure they will bury it in the bucket. However quantities and moisture may need to be adjusted? Anyway---add 5 or 6 pair of beetles (or as many as you can collect--search on line for how to collect, but usually pit traps with a bit of manure pat inside are used ( Nobody said it was going to be a clean job)."
I was aware of scientific studies of dung beetles using
Onthophagus taurusin short, the methods are...
"beetles are kept at a constant
temperature room at 26°C and 60% relative humidity (RH)
under a LD 16 : 8 h photocycle.
We obtained larvae by allowing five pairs of adult beetles,
selected at random from the colony, to breed in plastic
containers (25 cm tall, 20 cm diameter) filled with a moist
sand-soil mixture and provided with 0.5 L of cow manure
enriched with 4% wheat germ and 1% torula yeast. Breeding
containers were kept at 26°C and 60% RH under a LD 16 : 8 h
photocycle. A total of approximately 190 containers and 950
beetle pairs was used to produce over 5300 brood balls over the
course of this study. "
Thus, one pair gets 5 brood balls containing many larvae. They then take individual larvae to seed individual dung balls (around 2 cm) which were pressed into indentations of a 12 well cell culture plate (basically the size of a small water bottle cap). THey didn't say how long it would take to hatch.
rob