Estrous synchronization
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This document discusses methods for estrous synchronization in cattle and sheep. Estrous synchronization aims to group females for calving, shorten breeding seasons, and reduce estrus detection. Key methods include using progesterone-releasing implants, pessaries, or feeding melengestrol acetate to extend the luteal phase. Prostaglandins are then used to induce luteolysis and estrus. Common synchronization protocols for cattle include Ovsynch, which uses GnRH and PGF2α, and CIDR-based protocols. Vaginal sponges and CIDR implants of varying durations can also be used in sheep and goats.
Estrous synchronization
- 2. Why synchronize? Group females for parturition (calving interval) Shorten breeding season Reduce estrus detection
- 3. Extend of luteal phase: progesterone Shorten of luteal phase: Prostaglandins PGF2 Synchronization methods
- 4. progesterone • Method of application: 1. Injection: Time Consuming 2. Implant : Place in ear 3. Feed: Mix in ration 4. Pessary :Place in Vagina Vaginal spongy CIDR PRID
- 9. Pessary Vaginal spongy( used for sheep) Short term: 9 days Long term: 19 days CIDR For cow: 7 days For sheep,goat: 12-16 days PRID
- 10. Vaginal sponge Short term Vaginal Sponge At 1day At 7 day PMSG At 9 day remove of sponge then at day10-13 make estrus detection& Breed
- 11. Vaginal sponge long term Vaginal Sponge At 1day At day 17 PMSG At day 19 remove of sponge then at day27-30 make estrus detection& Breed
- 12. CIDR For cow: 7 days
- 13. CIDR For sheep,goat: 12-16 days
- 14. Prostaglandins PGF2 • 3 Protocols One Shot ( injection) Two Shot ( injection One injection with heat detection
- 17. Updated: 5/30/2014 Ovsynch (GPG) 7 Days 36 - 48 hours GnRH PGF2 8 - 18 hours Timed AI GnRH
- 18. • Modified Target breeding (PGP) PGF2 14Days GnRH 6-7 days PGF2 2-3 day Timed AI
- 19. Pre-Synch Protocol(PPGPG) begin at day 37 postpartum Synchronization at day 51 Cows are on Days 5-9 of cycle. New Follicular wave started (inject at day 63) Synchronized follicular wave. Regression of CL (inject at day 70) Clean Up Shot