Feeding Crude Glycerin to Lambs: Crude glycerin is a byproduct of biodiesel production that represents a potential ingredient for use in animal nutrition. The objective of this study was to evaluate the effect of diets containing different levels of crude glycerin on nutrient intake in male lambs. Four castrated male lambs weighing about 25kg were used in a 4 × 4 Latin square design. The experiment was divided in 4 periods of 13 days. The lambs were fed a basal diet (50:50 forage to concentrate) consisting of chopped hay, ground corn, soybean meal, urea and a mineral and vitamin premix, Crude glycerin was added to the basal diet at either 0, 5, 10 or 15% of diet dry matter. Diets were made isocaloric and isonitrogenous by the addition of ground corn and urea, respectively.
Results indicated that the inclusion of crude glycerin influenced the intake of nutrients (P < 0.01). The highest theoretical nutrient intake in kilograms per day was between 3.81 and 5.14% glycerol inclusion. The researchers concluded crude glycerin, when fed to lambs in a 50:50 forage-to-concentrate diet, can be included up to 5.14% of diet DM without negatively affecting the nutrient intake.