Abstract
The aim of this study was to determine the values of apparent digestible energy (DE) and metabolizable energy (ME) for crude glycerin derived of biodiesel based on pork fat for finishing pigs. The diets consisted of a basal diet and four levels of crude glycerin (0, 5, 10 and 15%). Twelve pigs were housed individually in metabolic cages and after seven days of adaptation, total collections of urine and feces for four consecutive days were performed. Gross energy (GE) of crude glycerin, diets, urine and fecal samples from each animal was determined. The crude glycerin used in this experiment presented 74.74% glycerin and 6,500 kcal kg -1 gross energy. The values of digestible energy (DE) and metabolizable energy (ME) were estimated by difference in the DE, and content of the basal diet was subtracted from the test diets containing the ingredient. The amount of GE, DE and ME for finishing pigs was 6,500, 5,839 and 5,509 kcal kg -1 , respectively, with a coefficient of 91.0% of DE and 94.0% of ME. The energy of crude glycerin is based on the levels of fatty acids and GE depends on the concentration of fatty acids and glycerin, ME being a percentage of GE averaging is 84.75%.
Highlights
Throughout the world, biodiesel has been one of the most widely used alternative energy source
The crude glycerin used in this experiment contained glycerin, moisture, fatty acids, protein, sodium (74.74, 10.32, 14.0, 0.88, 0.065%, respectively) and 6,500 kcal kg-1 of gross energy
Considering the economic value of the crude glycerin used in this trial compared with oils or fats, is important to consider it as a source of energy and fatty acids in the diet due to its low costs
Summary
Throughout the world, biodiesel has been one of the most widely used alternative energy source. Most of the countries recommend that diesel must contain some amount of biodiesel, and Brazil has abundant raw material, technological resources and framework with high capacity to develop its production (Ferreira-Leitão et al, 2010). Animal Sciences high production of biodiesel in the country is the destination of the crude glycerin, a by-product of biodiesel, that represents approximately 10% of the biodiesel produced (Bowker et al, 2009). An effective alternative may be it use in animal production (Eiras et al, 2014; Françozo et al, 2013). Pure glycerin is a colorless, odorless, and a sweet-tasting viscous liquid, containing approximately 4.3 Mcal of gross energy (GE) kg-1 as basis (Kerr et al, 2009)
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