New CIDR Based Synchronization System Gives Another Fixed Time AI Option

New CIDR Based Synchronization System Gives Another Fixed Time AI Option

Dr. John B. Hall, Extension Animal Scientist, Beef, VA Tech and

Dr. Dee Whittier, DVM, Extension Veterinarian, VA Tech.

Last year we reported on a Fixed Time AI system (CO-Synch+CIDR) that has become widely recommended in the industry for AI breeding of postpartum cows on a single day. http://www.ext.vt.edu/news/periodicals/livestock/aps-06_10/aps-367.html ).  Our work in Virginia indicates this program results in pregnancy rates of 55 % to 65% to fixed-time AI (FTAI).  In field studies in Missouri, the CO-Synch+CIDR system averaged 65% pregnancy rate in over 3000 cows in 35 herds.  The range in their studies was 57% to 72% AI pregnancy rate.  It should be noted that all herds were well managed with cows in good body condition.

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