Estrous Synchronization (Ovulation Induction)

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Presentation transcript:

Estrous Synchronization (Ovulation Induction) John Parrish Updated: 4/26/2017

Learning Objective To understand how estrus and ovulation manipulation work. The exact protocols were covered in lab and will not be repeated in this lecture. Details beyond this lecture are provided for you in the on-line lecture outline for your personal information only! Updated: 4/26/2017

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 Updated: 4/26/2017

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 Updated: 4/26/2017

Sheep Progestin Prostaglandin Lights - decrease day length 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 or IM Updated: 4/26/2017

Swine Prostaglandin Progestins - Altrenogest (Regumate) Wean Piglets 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 Updated: 4/26/2017

Equine Prostaglandin Progestins Light Lutalyse - similar usage as cow Mare CL more sensitive than cow’s Only effective in season Progestins Regumate Reduce estrus behavior in competition animals Light 16 hrs day light for 60 - 90 days. Updated: 4/26/2017