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Tom Jenkins, Professor Department of Animal & Veterinary Sciences

Hot Topic Fat vs. Corn: Time to Re-evaluate. Tom Jenkins, Professor Department of Animal & Veterinary Sciences. Hot Topic Fat vs. Corn: Time to Re-Evaluate Substituting Fats for Grains?.

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Tom Jenkins, Professor Department of Animal & Veterinary Sciences

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  1. Hot Topic Fat vs. Corn: Time to Re-evaluate Tom Jenkins, Professor Department of Animal & Veterinary Sciences

  2. Hot Topic Fat vs. Corn: Time to Re-Evaluate Substituting Fats for Grains? Dramatic increases in the price of corn have revitalized questions about the profitability of substituting fats for cereal grains in dairy rations. Cost/Unit Energy: Considerations about the energy value of fat. Considerations about the limitations to feeding fat?

  3. Hot Topic Fat vs. Corn: Time to Re-Evaluate Consideration #1 The Energy Advantage of Fat Over Corn • Total Energy (GE) values • Corn 2.09 Mcal/lb • Veg. oil 4.03 Mcal/lb • ~ 2/1 Energy advantage

  4. Hot Topic Fat vs. Corn: Time to Re-Evaluate NE Advantages of Fat Over Corn • NEl values • Corn 0.84 Mcal/lb (NRC) • Veg. oil 2.57 Mcal/lb (NRC) • ~ 3/1 Energy advantage • Replace 1 lb corn with fat • Increase NEl 1.73 Mcal • Potential milk increase 5.5 to 6 lb

  5. Hot Topic Fat vs. Corn: Time to Re-Evaluate Consideration #2 • Don’t assume all fat sources have the same energy content! • How do fat sources vary? • Fatty acid composition • Fatty acid content

  6. Hot Topic Fat vs. Corn: Time to Re-Evaluate Fatty Acid Composition

  7. Hot Topic Fat vs. Corn: Time to Re-Evaluate Consideration #2 • Don’t assume all fat sources have the same energy content! • How do fat sources vary? • Fatty acid composition • Fatty acid content

  8. Hot Topic Fat vs. Corn: Time to Re-Evaluate Fatty Acid Content of Dairy Fat Supplements Bypass Fats

  9. Hot Topic Fat vs. Corn: Time to Re-Evaluate Consideration #3 Adding fat will always increase diet energy density but not necessarily increase energy for milk.

  10. Hot Topic Fat vs. Corn: Time to Re-Evaluate Reasons to Lower Fatty Acids Three situations where adding fat might not increase (or even decrease) energy available for milk:

  11. Hot Topic Fat vs. Corn: Time to Re-Evaluate 5% Yellow Grease From Jenkins and Jenny. 1989. J. Dairy Sci. 72::2316.

  12. Hot Topic Fat vs. Corn: Time to Re-Evaluate 5% Yellow Grease From Jenkins and Jenny. 1989. J. Dairy Sci. 72::2316.

  13. Hot Topic Fat vs. Corn: Time to Re-Evaluate Bypass Fat Effects on Energy From Weiss et al., 2011, J. Dairy Science. 94:931-939.

  14. Hot Topic Fat vs. Corn: Time to Re-Evaluate Feeding Rates for Rumen-Active Fats • Choose a proper feeding rate for rumen-active fats • Depends on fat and ration characteristics

  15. Hot Topic Fat vs. Corn: Time to Re-Evaluate Fat Feeding Guidelines • Cows have maximum tolerance to fat

  16. Hot Topic Fat vs. Corn: Time to Re-Evaluate Fat Feeding Guidelines • Choose a proper feeding rate for rumen-active fats

  17. Hot Topic Fat vs. Corn: Time to Re-Evaluate Consideration # 4 Watch Other Nutrients When Adding Fat • Total protein • Fermentable CHO and microbial protein synthesis • Vitamins and minerals

  18. Hot Topic Fat vs. Corn: Time to Re-Evaluate Questions & Answers The Fatty Acid Forum sponsored by

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