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Results with Timed AI Systems

Results with Timed AI Systems. Syncro - Mate B 35-50% Preg Highly Variable Depends on stage of cycle OvSynch 40-60% Preg Less variable Co-synch 40-50% Preg Still working out details. Estrus Detection and AI Systems. MGA-PGF System. PGF. Estrus & Breed.

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Results with Timed AI Systems

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  1. Results with Timed AI Systems • Syncro - Mate B 35-50% Preg • Highly Variable • Depends on stage of cycle • OvSynch 40-60% Preg • Less variable • Co-synch 40-50% Preg • Still working out details

  2. Estrus Detection and AI Systems

  3. MGA-PGF System PGF Estrus & Breed Do Not Breed Feed MGA 14 31 37 1

  4. SELECT-SYNCH System GnRH PGF Estrus & Breed 7 12 0

  5. SYNCRO - MATE B System Nor + E2 Remove implant Estrus & Breed Implant 7 9 14 0

  6. MGA+PGF and Syncro-Mate B • MGA+PGF was better in synchronizing heifers • 57.3% vs 36.6% • MGA+PGF in large field studies in KY produced conception rates of 58.3% • Synchronization rate with SMB generally from 35 - 50 %

  7. MGA + PGF vs PGF Patterson et al., 1995

  8. Select Synch vs PGF

  9. Results from Estrus Detection + AI Systems • MGA + PGF best system for heifers • MGA +PGF resulted in increased fertility in some studies • Syncro-Mate B highly varaible • Select-synch looks promising, but also variable

  10. Experimental Systems

  11. GnRH-NOR-PGF System GnRH PGF Estrus & Breed Progestin 7 12 0

  12. PROG-PGF-E2 System PGF E2 Estrus & Breed Progestin 7 9 15 0

  13. Recommendations • Current estrous synchronization systems can enhance AI success especially in anestrous postpartum cows • Systems using GnRH have some advantages over older systems • Including progestins in GnRH systems may further improve conception rates to synchronized estrus

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