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Estrous Synchronization (Ovulation Induction) and Ovsynch

Estrous Synchronization (Ovulation Induction) and Ovsynch. John Parrish. Learning Objective. To understand how estrus and ovulation manipulation work. Details are provided for you to review on your own time!. Estrus synchronization: Why? 1. Group females for parturition:

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Estrous Synchronization (Ovulation Induction) and Ovsynch

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  1. Estrous Synchronization (Ovulation Induction)and Ovsynch John Parrish

  2. Learning Objective To understand how estrus and ovulation manipulation work. Details are provided for you to review on your own time!

  3. Estrus synchronization: Why? 1. Group females for parturition: a. Labor, Calving period b. More uniform weaning weights. 2. Reduce or eliminate estrus detection. 3. Needed for artificial insemination: Reduce calving season

  4. Cattle • Prostaglandins - Regression of CL • Lutalyse, estrumate • Progestins - Prevents estrus and ovulation • CIDR, MGA • Combined with prostaglandins • GnRH - Ovulation, terminate follicular wave • Combined with prostaglandins in Ovsynch

  5. Sheep • Progestin • CIDR, vaginal pessary (sponge) • In season - works alone • Out of season - requires eCG • Prostaglandin • Lutalyse, estrumate • Only works in season • Lights - decrease day length • Melatonin - give orally

  6. Swine • Prostaglandin • Not of practical use (only effect days 12 - 17) • Progestins - Altrenogest (Regumate) • MGA causes ovarian cysts • Regumate (oral) for 18 days • Cost is $5 - $10/day • Wean Piglets • Puberty Induction - PG600

  7. Equine • Prostaglandin • Lutalyse - similar usage as cow • Mare CL more sensitive than cow’s • Only effective in season • Progestins • Regumate • Reduce estrus behavior in competition animals • Only effective in season • Light • 16 hrs day light for 60 - 90 days.

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