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2004

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Kansas Agricultural Experiment Station Research Reports

2004; Kansas Agricultural Experiment Station contribution; no. 04-242-S; Report of progress (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service); 923; Beef; Estrus synchronization; Prostaglandin F2α (PGF); Progesterone (CIDR)

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Estrus Synchronization Of Suckled Beef Cows By Using Gnrh, Prostaglandin F2Α (Pgf), And Progesterone (Cidr): A Multi-Location Study, J.E. Larson, G.C. Lamb, Jeffrey S. Stevenson, T.W. Marston, Sandra K. Johnson, M.L. Day, T.W. Geary, D.J. Kesler, J.M. Dejarnette, F.N. Schrick Jan 2004

Estrus Synchronization Of Suckled Beef Cows By Using Gnrh, Prostaglandin F2Α (Pgf), And Progesterone (Cidr): A Multi-Location Study, J.E. Larson, G.C. Lamb, Jeffrey S. Stevenson, T.W. Marston, Sandra K. Johnson, M.L. Day, T.W. Geary, D.J. Kesler, J.M. Dejarnette, F.N. Schrick

Kansas Agricultural Experiment Station Research Reports

Our objectives were to determine whether a fixed-time artificial insemination (TAI) protocol could yield pregnancy rates similar to a protocol requiring detection of estrus and whether inclusion of a CIDR (a vaginal insert containing progesterone) in protocols using gonadotropin-releasing hormone (GnRH) and prostaglandin F2α(PGF) would enhance fertility. Postpartum suckled beef cows (n = 2,630) from 14 locations were assigned randomly to each of five estrus-synchronization protocols using PGF with GnRH and(or) a CIDR. Protocols were Control, CO-Synch, COSynch+ CIDR, Hybrid-Synch, and Hybrid-Synch+CIDR. The percentage of cows cycling at the initiation of estrus synchronization was 66.8%, the ...