Abstract
Four Holstein cows were used in a 4 × 4 Latin square design to investigate the effects of soybean hulls and lignosulfonate-treated soybean meal on ruminal fermentation and nutrient passage to the duodenum. Diets contained 32% corn silage, 19.8% alfalfa-grass hay, and 48.2% concentrate (DM basis). Treatments, arranged in a 2 x 2 factorial, were concentrate mixes based on 1) corn and soybean meal, 2) corn and treated soybean meal, 3) soybean hulls and soybean meal, and 4) soybean hulls and treated soybean meal. Individual protein supplements supplied 40% of dietary CP, and corn or soybean hulls constituted 28% of dietary DM. Intake of OM (mean 18.9 kg/d) was similar among treatments, but intake of NDF was 42% greater, and intake of nonstructural carbohydrate was 55% less, for cows fed soybean hulls. Passage of OM to the duodenum was similar among diets, but flow of NDF was 43% greater, and flow of nonstructural carbohydrate was 56% less, for cows fed soybean hulls. Ruminal pH was similar, but total concentrations of VFA increased 7% when soybean hulls replaced corn. Ruminal digestion of dietary CP was 15% less for cows fed treated soybean meal, but bacterial N flows were similar among treatments. Soybean hulls were digested to a similar extent as corn, but few interactions occurred between supplemental carbohydrate and protein sources.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 1070-1083 |
| Number of pages | 14 |
| Journal | Journal of Dairy Science |
| Volume | 77 |
| Issue number | 4 |
| DOIs | |
| State | Published - 1994 |
Bibliographical note
Funding Information:The authors thank the Minnesota Soybean Research and Promotion Council, Archer Daniels Midland Co. Inc., the Agricultural Utilization Research Institute, and United Market Services Co. for financial support. We also thank Archer Daniels Midland for supplying SH and CenexlLand O'Lakes for supplying LSBM and SBM.
Funding Information:
Received September 20, 1993. Accepted December 10, 1993. lPublished as Paper Number 20,842 of the scientific series of the Minnesota Agricultural Experiment Station on research conducted under Minnesota Agricultural Experiment Station Project Number 16-048 supported by Minnesota Soybean Research and Promotion Council, Mankato, MN; Archer Daniels Midland Co., Decatur, IL; Agricultural Utilization Research Institute, Crookston, MN; and United Market Services Co., S. St. Paul, MN. 2Send reprint requests to M. D. Stem, 130 Haecker Hall, Department of Animal Science, University of Minnesota, 1364 Eckles Avenue, St. Paul 55108.
Keywords
- LSBM
- MCP
- NFC
- SBM
- SH
- TNC
- lignosulfonatetreated SBM
- microbial CP
- nonfibrous carbohydrates
- ruminal fermentation
- soybean hulls
- soybean hulls
- soybean meal
- total nonstructural carbohydrates
- treated soybean meal