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Reproduction & Breeding

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Reproduction & Breeding

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Reproduction & Breeding

  1. 1. EQUINE MEDICINE Reproduction and Breeding
  2. 2. Stallion  Sperm production  Begins as yearling  Maturity at 4 yrs  Ejaculation  Emission • Release of semen • Pulsatile contractions  Ejaculation • Expulsion of fluid
  3. 3. Mare  Placenta  Direct attachment • Blood • Oxygen • Nutrients
  4. 4. Cycles  Seasonally polyestrus  Start-15-24 months  Lasts 21-22 days  Regular season • Jan/Feb-June  Transition phase • Feb/March • Sept/Oct
  5. 5. Cycles  Follicle stimulating phase  Estrus behavior • Relaxed cervix • Clear discharge • Raised tail • Squat/Urinate • Winking • Begins 6-8 days • Breeding 3-4 days  Luteal phase  Progesterone production • Swish tail • Pin ears, kick
  6. 6. Fertilization  Occurs in ova duct  Uterine horn-5-6 days  Implantation 15-18 days  Gestation-335 days
  7. 7. Sterility  Abortion  Fetal loss <300 days gestation  Still birth  Fetal loss >300 days gestation
  8. 8. Breeding Considerations  Appearance  Pedigree  Genetic abnormalities  Disposition  Conformation  Athletic ability
  9. 9. Breeding Considerations  Age  Young • Irregular heat cycles  Aged • Anatomical changes
  10. 10. Breeding Considerations  Breed  Requirements for registry  Status  Maiden  Barren/open  Wet
  11. 11. Breeding Considerations  Breeding Records  Health  Gestation length  Abnormalities  Athletic Use  Injuries/Disease  Drug Therapies  Health  Nutrition
  12. 12. Mating  Live Cover  Horses held  Pasture  Best conception rate  Artificial Insemination  Not all registries  Safest for mare and foal
  13. 13. Mating Embryo Transfer Flushing Implantation Surgical Implantation
  14. 14. Pregnancy Diagnosis  Rectal Palpation  Late in first semester  Ultrasound  14 days gestation  22 days heart beat  Blood Work  Pregnancy diagnosis  Pregnancy support
  15. 15. Pregnant Mare Care  Routine dental and hoof care  Nutrition  Parasite Control  Vaccinations

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