I am not sure that I have ever used the word dregs in a post let alone posted about the dregs but it appears that there is something to them for the inventive or penny-wise brewer:

The brewing giant hopes the move would help cut congestion outside its Westgate site and offer an environmentally-friendly way of using the discarded sediment and beer remnants from the bottom of its casks. Because pubs are encouraged to use their 72-pint firkins of beer within three days - during which time the beer is in its best condition - there is usually some wastage. Rich in yeast, these leftovers have a high nutritional value. As a result, once it has been processed, the beer-based produce is being sent out to farmers for animal feed and to spray on crops.

That seems reasonable. I had heard about great beef being fed upon the spent grains from breweries, like at New York's Captain Lawrence. And I know the wee beasties out by the compost like when it is brewing day around here. But I did not know, for example, that the Department of Fisheries and Aquaculture of Uganda was using it - look at table 2 and the costs set out in table 4. Fish love dregs. Who knew?