Animal feed plays an important part in the food chain and has implications for the composition and quality of the livestock products (milk, meat and eggs) that people consume. Glycerine is commonly used as an animal feed. Researchers at Iowa State University (ISU) and the USDA found that pigs fed a 20% glycerine diet showed equal growth performance between the glycerine-supplemented diet and a more conventional corn/soy meal diet. Another study at ISU, using poultry fed a 5%, 10% and 15% glycerine diet found the energy was used with high efficiency by 48 laying hens with no adverse effects (McElroy 2007). A study conducted on cattle fed 5%, 10% and 20% glycerine at the university of Missouri-Columbia found for maximum results, feed efficiency on a 10% diet inclusion of glycerine produced a 12% improvement in feed efficiency and equal weight gains to a diet with no glycerine. The study also showed that at a 10% addition of crude glycerine to feed for cattle, the average daily weight gain was 635 grams compared to 590 grams without the glycerine (Fienman 2007).