Abstract
The objective of this study was to evaluate the physicochemical and nutritional characteristics of meat from three muscles of Ile de France lambs fed diets containing different levels of glycerin as an alternative to corn. Thirty non-castrated feedlot Ile de France lambs weighing 15±0.2 kg were housed in individual pens and slaughtered at 32±0.2 kg. Treatments consisted of three diets: sugarcane + 0% glycerin; sugarcane + 10% glycerin; and sugarcane + 20% glycerin; and three muscles were evaluated: triceps brachii, semimembranosus, and longissimus lumborum. No interactions were observed among glycerin levels and muscle types for the quality characteristics evaluated. Muscles were similar in terms of physicochemical and nutritional characteristics, and only differed in sarcomere length, diameter of muscle fibers, and cholesterol content. Dietary glycerin did not affect pH, water holding capacity (24 h and 30 days after slaughter), weight loss by thawing and cooking, shear force, diameter of muscle fibers, sarcomere length, lipid oxidation, chemical composition, or meat cholesterol content. Dietary glycerin resulted in a linear decrease of muscle yellowness from 3.99 to 3.29. Dietary glycerin altered intramuscular fat fatty acid profile, increasing the concentration of margaric acid (1.47 to 2.61%). Up to 20% glycerin can be included in the diet of feedlot lambs without any harm to meat quality.
Highlights
The demand for animal protein has increased worldwide in the past decades (Tilman and Clark, 2014)
Treatments consisted of three diets: sugarcane + 0% glycerin; sugarcane + 10% glycerin; and sugarcane + 20% glycerin; and three muscles were evaluated: triceps brachii, semimembranosus, and longissimus lumborum
Up to 20% glycerin can be included in the diet of feedlot lambs without any harm to meat quality
Summary
The demand for animal protein has increased worldwide in the past decades (Tilman and Clark, 2014). This recent development has pushed producers in the search for better and cheaper practices. Better diets shorten time to slaughter and produce better-quality lambs for an ever-more demanding consumer market. This production system is costly, and the use of alternative feeds that do not affect meat quality is greatly needed. The growing Brazilian biodiesel industry has become a source of the alternative feed glycerin, a biodiesel co-product that can substitute corn and sorghum with the advantage of being sweet-tasting and well accepted by animals (Schröder and Südekum, 1999)
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