Browsing Cattlemen's Day by Subject "GnRH"

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Browsing Cattlemen's Day by Subject "GnRH"

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  • Corah, L.R.; Beal, W.E.; Spire, M.F.; Stevenson, Jeffrey S. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 2010-11-02)
    Injecting a GnRH-analog at the time of estrus or at insemination did not generally improve conception rates in heifers inseminated following a synchronized estrus. However, within some herds. a significant positive response ...
  • Ferguson, M.; Corah, L. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 2010-12-03)
    Injecting 100 mcg of GnRH into cycling heifers at artificial insemination following estrus synchronization with either prostaglandin or Syncro-Mate-B® did not improve first service conception rate. However, GnRH improved ...
  • Larson, J.E.; Lamb, G.C.; Geary, T.W.; Stevenson, Jeffrey S.; Johnson, Sandra K.; Day, M.L.; Kesler, D.J.; DeJarnette, J.M.; Landblom, D.G.; Whittier, D. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 2010-08-03)
    Our objectives were to determine whether a fixed-timed artificial insemination (TAI) protocol could yield similar fertility rates to a protocol requiring detection of estrus and whether an injection of gonadotropin ...
  • Thompson, K. E.; Lamb, G.C.; Marple, T.J.; Corah, L.R.; McKee, R.M.; Stevenson, Jeffrey S.; Grieger, David M.; Nichols, David A. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 2010-09-02)
    At the KSU Purebred Unit, 164 purebred Angus, Hereford, and Simmental cows were used to test a new estrus-synchronization program using GnRH, PGF2, and norgestomet. Cows were inseminated after detected estrus, or in the ...
  • Thompson, K. E.; Lamb, G.C.; Stevenson, Jeffrey S.; Grieger, David M. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 2010-08-23)
    As in our previous studies, the GnRH + PGF2" treatment was very effective in inducing a fertile estrus and(or) ovulation. Ovulations induced in response to the first GnRH injection averaged 48% in three herds and ranged ...
  • Lamb, G.C.; Cartmill, J.A.; Hensley, B.A.; Marple, T.J.; Stevenson, Jeffrey S. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 2010-08-23)
    The Cosynch protocol (GnRH 7 days before and again 48 h after PGF2" with AI at the second GnRH injection) produced pregnancy rates in suckled beef cows that exceeded 50% without heat detection and with only three handlings ...
  • Eborn, D.R.; Blair, E.E.; Grieger, David M. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 2011-03-30)
    The EAZI-BREED CIDR is commonly used in estrous synchronization protocols for both beef heifers and cows. The label calls for insertion of a progesterone-impregnated controlled internal drug release (CIDR) for 7 consecutive ...
  • Forbes, W.L.; Corah, L.R.; Thompson, K. E.; Lamb, G.C.; Grieger, David M.; Stevenson, Jeffrey S. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 2010-09-02)
    We used four herds at three Kansas ranches to evaluate the potential of two new estrus synchronization strategies to increase estrus expression and fertility of 911 crossbred suckled beef cows. The treatments included: 1) ...
  • Hoffman, D.P.; Stevenson, Jeffrey S.; Krehbiel, C.L.; Nichols, David A.; McKee, R.M. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 2010-09-03)
    Suckled cows and virgin heifers received a novel treatment that included PGF 2", GnRH, and norgestomet, with the objective of inducing estrus in prepubertal heifers and anestrous suckled cows, as well as synchronizing ...
  • Hill, Scott L.; Pulley, Stephanie Leeann; Olson, K. C.; Jaeger, John R.; Breiner, Ryan M.; Lamb, G.C.; Stevenson, Jeffrey S. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 2013-03-19)
    Fixed-time artificial insemination is an effective management tool that reduces the labor associated with more conventional artificial insemination programs requiring detection of estrus. The 7-day CO-Synch + controlled ...
  • Lamb, G.C.; Cartmill, J.A.; Hensley, B.A.; El-Zarkouny, S.E.; Marple, T.J.; Stevenson, Jeffrey S.; Grieger, David M. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 2010-08-23)
    In two experiments, combining a source of progestin with the ovulation synchronization protocol using gonadotropin-releasing hormone plus prostaglandin F2a (GnRH + PGF2a) tended to increase or statistically increase ...
  • Lamb, G.C.; Cartmill, J.A.; Hensley, B.A.; El-Zarkouny, S.; Heldt, J.S.; Marple, T.J.; Stevenson, Jeffrey S. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 2010-08-23)
    The Select Synch protocol (GnRH at day - 7, PGF2 at day 0, AI at detected heat) was compared to protocols using either MGA + prostaglandin (Colorado system) or two injections of prostaglandin to synchronize estrus ...
  • Johnson, Sandra K.; Harmoney, Keith R.; Stevenson, Jeffrey S. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 2010-08-06)
    Lactating beef cows (n=360) were synchronized using the Cosynch procedure; 100 μg of GnRH (day −7) followed in 7 days by 25 mg of PGF2α (day 0). A used intravaginal progesterone insert (CIDR-B) was inserted on day −7 and ...
  • Broweleit, B.; Huston, J.E.; Grum, D.E.; Day, M.L.; Johnson, Sandra K. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 2010-08-23)
    We examined the potential of adding gonadotropin-releasing hormone (GnRH) to a synchrony system based on melengestrol acetate-prostaglandin F2(MGA-PGF2) to increase the precision of synchronized estrus and augment ...

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