Abstract
This study was conducted to evaluate the effects of the inclusion of low-purity crude glycerin (CG, 63.1% of glycerol) in the diets of feedlot-finished goats on the weights and yields of the non-carcass components, with are frequently used in regionals dishes (buchada and panelada). Forty castrated male goats with the initial mean body weight of 19.70 ± 2.30 kg were used. Experimental treatments consisted of inclusion of CG at levels of 0, 6, 12, and 18%, based on dry matter. The weights of the lungs, spleen, total organs (TWO), and TWO yield, as a function of the slaughter body weight, decreased linearly. It was shown that the rumen portion of the weight showed a quadratic effect, at the level of 10.71% of CG, with a minimum point of 0.37 kg. Similar behavior was observed for the reticulum, with a minimum point of 0.08 kg, at the level of 7.5% of CG. The weights and yields of the buchada and panelada were negatively influenced by the experimental diets. Low-purity crude glycerin may partially replace corn and be included in up to 6% of the dry matter of the finished goats' feedlot diet without adversely affecting weights and yields of organs, viscera, and regional dishes, such as buchada and panelada.
Highlights
Goat farming is an activity of great importance in the Brazilian Northeast, providing employment and income for the local residents through the commercialization of meat, milk and skin
Crude glycerin is a co-product of the biodiesel industry that has been widely used as a substitute for corn in ruminant diets as an alternative source of energy, primarily during periods of drought in semi-arid regions (Eiras et al, 2014; Carvalho et al, 2015; Lage et al, 2017)
Gastrointestinal tract content (GTC) showed increasing linear behavior (p < 0.05); for every 1% increase of GB, GTC increased by 0.092 kg, and the goats that received 18% crude glycerin (CG) differed from the control treatment
Summary
Goat farming is an activity of great importance in the Brazilian Northeast, providing employment and income for the local residents through the commercialization of meat, milk and skin. One of the alternatives could be the finishing of goats using a feedlot, making for good the supply and uniformity of carcasses and meat cuts for the consumer market; there is a need to reduce production costs. Mach, Bach, and Devant (2009) reported no effect of dietary glycerin inclusion (4, 8, 12 and 16% DM) on performance and feed intake of cattle finished in a feedlot and fed on a high-concentrate level. On the other hand, Parsons, Shelor, and Drouillard (2009) found that the addition of glycerin (8% on DM) to the diet reduced the final body weight (BW) and decreased the feed efficiency of cattle fed a high-concentrate level in a feedlot
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