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Lignin Effects on Intake and Ruminal Digestion

OABP Spring Meeting April 13 & 14, 2011 Guelph Ontario. Lignin Effects on Intake and Ruminal Digestion. Dr. Mike Brouk. mbrouk@ksu.edu 785-532-1207. Lignin – Enemy of Digestibility. Lower fiber digestibility Increased retention time in rumen Increased gut fill Lower intake

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Lignin Effects on Intake and Ruminal Digestion

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  1. OABP Spring Meeting April 13 & 14, 2011 Guelph Ontario Lignin Effects on Intake and Ruminal Digestion Dr. Mike Brouk mbrouk@ksu.edu 785-532-1207

  2. Lignin – Enemy of Digestibility • Lower fiber digestibility • Increased retention time in rumen • Increased gut fill • Lower intake • Lower milk production • Reduced body condition score? • Reduced reproductive performance?

  3. Van Soest Fiber Analysis Ground forage material Digest with neutral detergent solution Neutral Detergent Solubles ( Cell Contents ) Neutral Detergent Insoluble Fiber (NDF) Digest with acid detergent solution Acid Detergent Solubles Hemicellulose, cell wall N Acid Detergent Insoluble Fiber (ADF) Digest with sulfuric acid Solubles ( Cellulose ) Acid Insoluble Lignin

  4. Application of Fiber Analysis

  5. NDF and Intake

  6. Digestibility • NDF Digestibility (NDFD) • 30 or 48 hours of incubation in rumen fluid • Estimation based on lignin content • in vitro procedure • 24, 30 or 48 hour

  7. Influence of NDFD on TDN

  8. Forage NDFD and DMI

  9. Responses of Cattle

  10. Grass Maturity and NDFD

  11. Legume Maturity and NDFD

  12. Corn Silage Maturity and NDFD

  13. Corn Silage Composition and Maturity(Bal, et al. 1997. JDS 80:2497-2503)

  14. Influence of Grain on NDF

  15. Alfalfa Maturity

  16. Reduced Lignin and Animal Performance Oliver, et al. 2004

  17. Lignin and Animal Performance Aydin, et al. 1999

  18. Application of Lignin in Formulation • How does lignin impact fermentation? • What is the interaction between lignin and intake regulation?

  19. Impact on Fermentation • Reduced digestibility • Increased retention time • Decreased intake Aydin, et al. 1999

  20. Control of Feed Intake • Dry Cow – Transition • Mobilization of body fat - NEFA • Fermentability of the diet • Early to Peak Lactation • Distension • Post Peak • Fermentability of the diet • Plasma insulin concentration • Tissue sensitivity to insulin

  21. Potential of Lignin to Influence Animal Performance • Early Lactation • Digestibility • Intake – Gut Fill • Post Peak • Digestibility

  22. Challenges to Using Lignin in Formulation • Methods of testing • Within lab variation • Between lab variation Oliver, et al. 2004

  23. Challenges to Using Lignin in Formulation • Grouping of animals • Single Lactation TMR’s • Lack of data on specific groups • Identification of first limiting factor of production or efficiency

  24. Challenges to Using Lignin in Formulation • Source of lignin • Cottonseed hulls • By-product feeds • Lack of specific recommendations

  25. Current Application in Formulation • Experimental • Limited in practical application due to on farm practices and measurements

  26. Research Needs • Interaction of lignin with regulation of intake • Stages of production • Group specific performance data

  27. Summary • Lignin can influence intake and digestibility • Lignin can influence productivity and efficiency of production • Limited recommendations for TMRs at this time • Variable results in the field • Many variables involved

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