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United States Department of Agriculture

Agricultural Research Service


Location: Livestock Nutrient Management Research

Title: Use of crude glycerin in steam-flaked corn-based growing diets

item Bondurant, Robby
item Luebbe, Matt
item Hales, Kristin
item Cole, Noel
item Macdonald, Jim

Submitted to: Journal of Animal Science Supplement
Publication Type: Abstract Only
Publication Acceptance Date: 2/15/2012
Publication Date: 3/19/2012
Citation: Bondurant, R.G., Luebbe, M.K., Hales, K.E., Cole, N.A., Macdonald, J.C. 2012. Use of crude glycerin in steam-flaked corn-based growing diets. Journal of Animal Science Supplement. 90: 45-46.

Interpretive Summary:

Technical Abstract: Three experiments were conducted to evaluate the use of crude glycerin in steam-flaked corn (SFC) based beef cattle growing diets. Experiment 1 utilized 50 crossbred steers (initial body weight (BW) = 282 +/- 2 kg) to determine the effects glycerin concentration (0.0, 2.5, 5.0, 7.5, and 10.0% dry matter (DM) inclusion) on steer performance. In experiment 2, 54 crossbred steers (initial BW = 283 +/- 1 kg) were used to determine the effects of replace SFC or alfalfa hay (ALF) with crude glycerin on animal performance. Dietary treatments consisted of 0.0% crude glycerin (CON) or 7.5% crude glycerin which replaced either ALF (REPALF) or SFC (REPSFC). In experiment 3, in-vitro volatile fatty acid (VFA) concentrations were determined after 48-h of fermentation comparing crude glycerin, SFC, and ALF as substrates. In experiment 1, increasing dietary crude glycerin concentration resulted in a linear decrease in BW gain: feed DM intake (P = 0.05). Steer average daily gain and final BW tended (P = 0.08) to increase in a quadratic manner with 7.5% crude glycerin resulting in the greatest responses among treatments. No difference was found for final BW and dry matter intake (P > 0.11). In experiment 2, final BW increased 12 kg (P =0.04) for steers fed REPALF vs. CON. Steers fed REPALF also had a greater average daily gain of 0.17 kg/day (P= 0.03) vs. CON. Final BW and daily gain were similar for CON and REPSFC (P > 0.51). No differences in dry matter intake or gain: Feed intakes were found among treatments (P > 0.25). In experiment 3, using glycerin as a fermentation substrate resulted in an 83% increase in total volatile fatty acid concentration compared to ALF (P < 0.01), and similar total volatile fatty acid concentration compared to SFC (P = 0.42). The acetate to propionate ratio was reduced 12-fold for glycerin vs. SFC (P < 0.01), and reduced 25-fold for glycerin vs. ALF (P < 0.01). Crude glycerin appears to have a minimal impact on animal performance when replacing SFC, although the weight gain: feed intake ratio may be reduced by up to 4.5% when including glycerin at 7.5% of the diet dry matter, where average daily gain appears to be maximized. The energy value of crude glycerin is greater than ALF but appears to be less than SFC.

Last Modified: 07/24/2017
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