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Open AccessArticle

Performance and Ruminal Parameters of Boer Crossbred Goats Fed Diets that Contain Crude Glycerin

Department of Animal Science, Federal University of Vale do São Francisco, Petrolina, Pernambuco 56304-917, Brazil
Department of Animal Science, Federal University of Paraíba, Areia, Paraíba 58397-000, Brazil
Department of Animal Science, Federal University of Bahia, Salvador, Bahia 40210-730, Brazil
Department of Animal Science, State University of Southwest of Bahia, Itapetinga, Bahia 45700-000, Brazil
Department of Animal Science, Federal Rural University of Pernambuco, Recife, Pernambuco 50670-901, Brazil
Department of Animal Science, Federal University of Maranhão, Chapadinha, Maranhão 65500-000, Brazil
Author to whom correspondence should be addressed.
Animals 2019, 9(11), 967;
Received: 12 September 2019 / Revised: 8 November 2019 / Accepted: 10 November 2019 / Published: 13 November 2019
(This article belongs to the Special Issue Small Ruminant Nutrition and Metabolism)
There is an increasing interest in the use of by-products, such as crude glycerin in animal feeding, and many studies emphasize that the addition of these ingredients can reduce feed costs, avoid environmental problems, and serve as good energy sources for ruminants. However, there is little information available on the replacement of ground corn with crude glycerin in goat diets. We analyzed the effects of replacing corn with crude glycerin up to 150 g/kg of diet on feed intake and growth performance of goats. This substitution reduced consumption, digestibility, and performance.
This study aimed to evaluate the effects of four levels of crude glycerin (0, 50, 100, or 150 g/kg on a dry matter basis) on intake, digestibility, production performance, and ruminal parameters for finishing Boer crossbred goats. Thirty-two crossbred, castrated Boer × undefined breed goat kids, with an initial average weight of 17.8 ± 2.2 kg and approximately four months old, were distributed in a completely randomized design, with four treatments and eight repetitions. The dry matter and neutral detergent fiber intakes, both in g/day and percent of body weight, linearly decreased (p ≤ 0.05) with increased inclusion levels of crude glycerin in the diet. The dietary crude glycerin levels linearly decreased (p ≤ 0.01) the digestibility coefficients of ether extract and quadratically increased (p = 0.04) digestibility coefficients of neutral detergent fiber. The final weight, total weight gain, and average daily gain for the animals showed a linear decrease (p ≤ 0.02) as dietary crude glycerin levels increased. The addition of crude glycerin caused a linear increase in ruminal pH (p ≤ 0.01), which ranged from 6.27 to 6.49 for diets with 0 and 150 g/kg crude glycerin, respectively. The concentration of ruminal NH3–N exhibited a linear decrease as the crude glycerin inclusion levels increased (p ≤ 0.01). Total short-chain fatty acid (SCFA) concentration, individual molar ratio, and the acetate: Propionate ratio in the ruminal fluid of the animals were not influenced (p ≥ 0.07) by the dietary crude glycerin levels. These data indicate that crude glycerin should not be used to replace ground corn in the diets of growing goats that are finished in a feedlot because the substitution reduces the intake and digestibility of several nutrients and decreases performance. View Full-Text
Keywords: alternative feed; biodiesel; feedlot; glycerol; weight gain alternative feed; biodiesel; feedlot; glycerol; weight gain
MDPI and ACS Style

Bezerra, H.; Santos, E.; Oliveira, J.; Carvalho, G.; Silva, F.; Cassuce, M.; Perazzo, A.; Zanine, A.; Pinho, R. Performance and Ruminal Parameters of Boer Crossbred Goats Fed Diets that Contain Crude Glycerin. Animals 2019, 9, 967.

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