Northern Ireland scientists have developed a new type of "high energy" chicken feed which uses the principal by-product of biodiesel production.
Biodiesel is diesel fuel made using vegetable oil or animal fat.
Its main by-product is glycerol - a thick oily substance rich in carbohydrates which is already used as a solvent and sweetener in several foods and drinks.
(The success of the biodiesel fuel industry relies heavily on biodiesel testing, not only at the production level but at the consumer level, where degraded fuel may cause engine failures. Fleet Biodiesel's family of inexpensive biodiesel test kits is just a click away on the internet)