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1422
Effect of harvest method on digestibility of corn residue

Thursday, July 21, 2016: 3:45 PM
155 F (Salt Palace Convention Center)
T. M. King , University of Nebraska-Lincoln, Lincoln, NE
M. L. Jolly-Breithaupt , University of Nebraska Lincoln, Lincoln, NE
J. L. Gramkow , University of Nebraska, Lincoln, NE
J. C. MacDonald , University of Nebraska-Lincoln, Lincoln, NE
Terry J. Klopfenstein , University of Nebraska, Lincoln, NE
Audio File Recorded Presentation (mp4)
Abstract Text:

Advanced techniques of harvesting corn residue has led to improved residue quality by reducing proportion of stem in the bale.  The objectives of this study were to determine 1) the effect of harvest method on the digestibility and quality of corn residue and 2) the effect of drying method used to process feces on digestibility estimates.  An 85 d digestion study was conducted utilizing 9 crossbred wethers (initial BW = 42.4 kg; SD = 7 kg) blocked into 3 blocks based on initial BW.  Residue based diets contained corn residue harvested with 1 of 3 methods (low-stem, high-stem, and conventional) at 70:27:3 residue: Sweet Bran®: bromegrass hay (DM basis).  Five periods of 17 d provided 10 d for adaption and 7 d for total fecal collection.  Sweet Bran® and bromegrass hay were fed at a 9:1 ratio in the fourth period for determination of residue digestibility by difference.  Feces were collected twice daily, composited at the end of the period, and dried using 1 of 3 methods (60 degree C forced air oven, 100 degree C forced air oven, and freeze dry technique).  No differences in DM intake, OM intake, or NDF intake were observed amongst residue type (P > 0.05).  Low-stem had greater DM digestibility (DMD) than conventional (P = 0.02) and had a tendency to be greater than high-stem (P = 0.06).  There were no differences in DMD (P = 0.63) or OM digestibility (OMD; P = 0.86) between high-stem and conventional.  Low-stem had greatest OMD and NDF digestibility (NDFD, P < 0.05).  High-stem had a NDFD which was greater than conventional (P < 0.01).  Drying method had no effect on digestibility determination by lab assays for both OMD and NDFD (P = 0.99).  Overall low-stem had the greatest digestibility with high-stem being intermediate and conventional having the lowest digestibility.  Reducing the proportion of stem in the bale through changes in the harvest method can lead to an increased quality of corn residue.

Keywords: Corn residue, Digestibility, Harvest method

See more of: Ruminant nutrition: Forages and crop residues
See more of: Ruminant Nutrition
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