Known around here under the euphemism ‘poo-brew’. Mix it up in a 55 gallon barrel: cow manure, cow urine (we catch it in a bucket when someone forgets where she is and pees in the milking parlor), a couple of handfuls of dirt from an undisturbed site like maybe the woodlot, or under a bush, plus some jaggery (raw sugar) and bean flour. Recommended proportions vary widely. Top the barrel up with water and stir once a day for up to a week. The smell is more than intense! We used this on and under the winter squash lasts summer. Beautiful large crop, despite the fact that the soil in that bed was mostly clay.
We post this to say that we have had, we think, excellent success substituting whey (a gallon or two) for the jaggery and bean flour — still contains sugar and protein, but tons of probiotics, too.