CO-Synch
This protocol allows synchronization of ovulation for timed A.I. The ovulation synchronization protocol is termed CO-Synch and includes an additional injection of GnRH with timed A.I. 48 hours after the PGF injection. This second GnRH injection induces ovulation in cows that have not yet exhibited estrous.The CO-Synch protocol makes heat detection unnecessary and yields pregnancy rates similar to breeding after detecting estrous. Higher pregnancy rates might be obtained by breeding cows that show estrous prior to day nine and mass mating remaining cows on day nine with the second injection of GnRH. The 48-hour time period may be critical, as waiting until day 10 to give the second GnRH injection coupled with mass mating appears to decrease pregnancy rates in some instances. There is also a timed synchronization program called Ovsynch. This program is administered very similarly to CO-Synch. The only difference being the cows are A.I.Õed 8 to 18 hours after the second GnRH injection. Either of these systems can produce acceptable fertility results and research has yet to determine conclusively which is best.
Desired Calving Date:
  

Instructions
Preplanning
1. Enter desired calving date.
2. Enter previous calving date

Injection Program
3. Inject 1st GnRH injection
4. Inject PGF injection
5. Inject 2nd GnRH injection & Breed

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Should Have Calved By:
  
GnRH Injection:
  
PGF Injection:
  
GnRH Injection & Breed: