375
Effect of crude glycerin concentration on growing steer performance in forage diets

Tuesday, March 15, 2016: 10:45 AM
308-309 (Community Choice Credit Union Convention Center)
Robert G. Bondurant , University of Nebraska, Lincoln, NE
J. C. MacDonald , University of Nebraska-Lincoln, Lincoln, NE
G. E. Erickson , University of Nebraska, Lincoln, NE
Terry J. Klopfenstein , University of Nebraska, Lincoln, NE
Abstract Text:

Crossbred steers (n = 60, initial BW = 361; SD = 42 kg) were utilized to evaluate increasing concentrations of crude glycerin (GLY) in forage diets on steer performance for a 91 d growing trial. Treatment diets consisted of 0, 4, 8, and 12% GLY (diet DM) in diets containing 50% wheat straw, wet corn bran, soybean meal, and 5% supplement. The GLY replaced wet corn bran in basal diets while soybean meal was increased to maintain equal dietary CP across treatments. Supplements were formulated to provide 200 mg/d monensin and equilibrate Na concentrations across treatment diets. Steers were limit fed for 5 d at the beginning and end of the trial with a 3 d BW collected to serve as initial and ending BW. Steers were implanted with Ralgro on d 1 of the trial. Steer final BW was not different (P = 0.40) among treatments. There was a quadratic increase (P = 0.03) in DM intake from 0% GLY to 8% GLY and subsequent decrease at 12% GLY. There was no difference in ADG or G:F (P ≥0.14) among GLY concentrations. Therefore, GLY appears to have a similar energy value to wet corn bran in a forage diet.

Glycerin Concentration (Diet DM)

P-value

0%

4%

8%

12%

SEM

Linear

Quadratic

Initial BW, kg

361

360

360

362

1

0.83

0.23

Final BW, kg

481

476

478

475

4

0.40

0.74

DM intake, kg/d

9.35ab

9.81ab

9.99a

9.26b

0.27

0.93

0.03

ADG, kg/d

1.32

1.27

1.30

1.25

0.05

0.37

0.99

G:F

0.142

0.131

0.131

0.136

0.005

0.50

0.14

ab Means within rows differ P < 0.05.

Keywords: crude glycerin, growing, forage