It looks like the paper says they were given 3mg/kg THC per day for 5 consecutive days. So it does seem the dose is specified.
It's pre clinical and far from surprising but 3mg/kg is a lot of THC, the equivalent of using ~1g of strong stuff by yourself (assuming no THC is lost during consumption).
After looking up the potency of currently popular edibles, the highest dosage I could find per item was the Cheeba Chew Deca Dose(http://www.cheebachews.com/wp-content/uploads/2015/02/deca_1...) @ claimed 175mg of THC per piece (actual was 162.1). As far as I know, this is a heroic dose of THC of which the typical user would not frequent. In order to match the dosage within the mice, I'd have to eat just over 6 of these per days for a working week to produce the same results (obviously without comparing intake medium).
I understand this was to attempt to see if there were any issues that should be researched further, but the Ars article took it at face value and claimed we should (as humans) avoid during pregnancy.
It's pre clinical and far from surprising but 3mg/kg is a lot of THC, the equivalent of using ~1g of strong stuff by yourself (assuming no THC is lost during consumption).