Factors Affecting the Impact of Short Lactation Lengths (Early Weaning) on Sow Reproductive Performance

Brad Belstra

Presented at Purdue University Swine Day, 1999

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Table of Contents

  1. Factors Affecting the Impact of Short Lactation Lengths (Early Weaning) on Sow Reproductive Performance
  2. Just What is Considered 'Early' Weaning?
  3. Frequency Distribution of Lactation Length in the US
  4. Potential Sow Productivity Benefits
  5. Potential Reproductive Consequences
  6. Weaning-to-Estrus Interval (WEI)
  7. Conception Rate (CR)
  8. Subsequent Litter Size (SLS)
  9. Inhibitory Effects of Suckling on GnRH & LH Secretion
  10. LH Secretion Schematic
  11. Photo - Follicular Cysts, and Ovary with CL
  12. Reduced Preovulatory LH Surge
  13. Ovulation Rate (No. CL)
  14. Fertilization Rate (%)
  15. Embryonic Survival (%)
  16. Photo - Elongating Blastocysts
  17. Photo - d 30 Embryos
  18. Photo - Normal Uterine Endometrium
  19. Photo - Uterine Cysts
  20. Photo - Uterine Abcesses
  21. Photo - Uterine Edema, Hypertrophy
  22. Uterine Involution Length and Weight
  23. Incomplete Uterine Involution
  24. Early Weaning vs. Conventional Weaning
  25. Two Basic Counteractive Strategies
  26. Lactation Feed Intake
  27. Split Weaning
  28. Gonadotropin Treatment (PG 600Ò)
  29. Effect of PG 600Ò at Weaning (d 12) on Primiparous Sows
  30. Skip-a-Heat Breeding
  31. Progestagen Treatment (Regu-MateÒ)
  32. Inducing Lactational Ovulation
  33. Effect of Parity on WEI
  34. Effect of Genotype on WEI
  35. Top 10 Management Recommendations
  36. Top 10 Management Recommendations
  37. Top 10 Management Recommendations
  38. The Future

Index of 1999 Purdue Swine Day Articles