Abstract
The objectives of this trial were to evaluate the fatty acid profile, chemical composition, and sensory effects of crude glycerin on the longissimus dorsi muscle of crossbred Boer goat kids. Twenty crossbred Boer goat kids (20.8±2.9 kg of BW at slaughter) were used in a completely randomized block design to determine the effect of partial replacement of corn by crude glycerin on chemical composition, longissimus dorsi muscle fatty acid profile, and sensory characteristics of meat. Kids were penned individually for 51 d and fed an isonitrogenous (140.0±2.0 g.kg-1 CP, DM basis) diet composed of 700 g.kg-1 concentrate and 300 g.kg-1 Tifton (Cynodon sp.) hay. Increasing levels of crude glycerin (80.0 g/100 g glycerol, DM basis) were 0, 40, 80 or 120 g.kg-1. There was no effect on the moisture, protein, or total lipids in the longissimus dorsi; however, the ash content decreased linearly with glycerin addition. Linear decrease for linoleic acid (3.57, 2.84, 3.76, and 2.33) and ω6:ω3 ratio (10.61, 9.71, 7.26, and 7.18 for CG0, CG40, CG80 and CG120, respectively) was observed with crude glycerin inclusion. Saturated, monounsaturated, and polyunsaturated fatty acids were not affected by treatments. In the sensory assessment, crude glycerin changed the toughness, color intensity, and overall appreciation of the longissimus dorsi muscle. The partial replacement of corn by crude glycerin has a low impact on chemical composition and meat fatty acid profile. Based on the overall appreciation, it is recommended to include 80 g.kg-1 crude glycerin in the diet.
Highlights
The increase in biodiesel production has led to increased stocks of glycerol with a subsequent price reduction, making glycerol a potential high-energy feed source for ruminants (Avila et al, 2011)
Twenty crossbred Boer goat kids (20.8±2.9 kg of body weight (BW) at slaughter) were used in a completely randomized block design to determine the effect of partial replacement of corn by crude glycerin on chemical composition, longissimus dorsi muscle fatty acid profile, and sensory characteristics of meat
The objective of this study were to determine the effects of the partial replacement of corn by crude glycerin on the chemical composition, sensorial characteristics, and fatty acid profile of the longissimus dorsi muscle in goat kids
Summary
The increase in biodiesel production has led to increased stocks of glycerol with a subsequent price reduction, making glycerol a potential high-energy feed source for ruminants (Avila et al, 2011). Crude glycerin is a co-product of biodiesel production with a high concentration of glycerol. Due to the high production of biodiesel, there is a wide availability of crude glycerin, and it is becoming an interesting ingredient for animal nutrition. A potential application for glycerin is as a gluconeogenic substrate for ruminants (Chung et al, 2007). Glycerol enters the gluconeogenic pathway at the level of dihydroxyacetone phosphate and 3-phosphoglyceraldehyde (Leng, 1970; Krehbiel, 2008). Glycerin could be used as an energetic ingredient in animal diets replacing cereals, which are usually more expensive
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