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2002; Kansas Agricultural Experiment Station contribution; no. 02-318-S; Report of progress (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service); 890; Beef; Estrus; Heifers; CIDR-B; Fertility
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Fertility Of Heifers After Synchronization Of Estrus Using Gnrh, Pgf2Α, And Progesterone (Cidr), A.M. Richardson, B.A. Hensley, T.J. Marple, Sandra K. Johnson, Jeffrey S. Stevenson
Fertility Of Heifers After Synchronization Of Estrus Using Gnrh, Pgf2Α, And Progesterone (Cidr), A.M. Richardson, B.A. Hensley, T.J. Marple, Sandra K. Johnson, Jeffrey S. Stevenson
Kansas Agricultural Experiment Station Research Reports
Our objectives were to determine fertility of heifers after estrus synchronization using PGF2αpreceded by either progesterone, GnRH, or both. Beef (n = 193) and dairy (n = 246) heifers were assigned randomly to three treatments: 1) 50 μg of GnRH and a used intravaginal progesterone-releasing insert were administered on day −7, followed by 25 mg of PGF2αon day −1, and CIDR removal on day 0 (CIDR + GnRH + PGF); 2) the same as 1) but without the GnRH (CIDR + PGF); and 3) the same as 1) but without the CIDR (GnRH + PGF; modified Select Synch). Rates of …