Open AccessOptimizing a new 5-day CIDR-CO-Synch timed artificial insemination program
Author(s) -
Jeffrey S. Stevenson,
Stephanie Leeann Pulley,
H.I. Mellieon,
K. C. Olson,
Sandra K. Johnson,
David M. Grieger,
John R. Jaeger,
Ryan M. Breiner
Publication year - 2011
Publication title -
kansas agricultural experiment station research reports
Language(s) - English
Resource type - Journals
ISSN - 2378-5977
DOI - 10.4148/2378-5977.2880
Subject(s) - artificial insemination , ovulation , insemination , gonadotropin releasing hormone , insert (composites) , andrology , pregnancy , estrous cycle , zoology , biology , medicine , hormone , materials science , luteinizing hormone , sperm , genetics , composite material
The 7-day CO-Synch + CIDR protocol is a popular ovulation-synchronization program used by cow-calf producers to facilitate artificial insemination (AI). A progesterone-impregnated controlled internal drug release (CIDR) insert is placed intravaginally and an injection of gonadotropin-releasing hormone (GnRH) is given. After 7 days, prostaglandin F2α (PGF2α) is administered and the CIDR insert is removed. Between 58 and 72 hours after insert removal, cows are inseminated after another injection of GnRH to induce ovulation. Timed AI pregnancy rates generally have ranged from 40 to 60% when suckled cows are treated with the 7-day CO-Synch + CIDR protocol.
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