Browsing Cattlemen's Day by Subject "Estrus"

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Browsing Cattlemen's Day by Subject "Estrus"

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  • Middleton, C.; Brink, T.; Kiracofe, G.; Brethour, J.; Negus, R. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 2010-12-10)
    Conception rates and subsequent calving dates were compared between cows synchronized with Syncro-Mate-B® and inseminated by appointment and nonsynchronized cows bred by natural service. Average conception date was ...
  • DeBenedetti, R.C.; Kiracofe, G.H.; Ward, H.S.; McKee, R.M. (Kansas State University. Agricultural Experiment Station, 2011-03-04)
    One hundred seven of 112 heifers were in estrus 1 to 5 days after an injection of prostaglandin F2α given when a 7-day synchronization implant was removed. Checks for estrus were made every four hours and heifers were ...
  • 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 ...
  • Heersche, G. Jr.; Kiracofe, G.; McKee, M.; Ames, D.R. (Kansas State University. Agricultural Experiment Station, 2011-03-11)
    Thirty of the 50 heifers used in estrous synchronization studies and that received prostaglandin and Syncro-Mate B to synchronize estrus were subjected to sound stress for 48 hours after prostaglandin was injected. Fifty-nine ...
  • Boyd, G.W.; Patterson, D.J.; Corah, L.R.; Brethour, J.R. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 2010-12-03)
    Three trials were conducted in the spring of 1985 to evaluate the effectiveness of MGA feeding and Prostaglandin (PGF) injection on estrus induction and synchronization. Trials 1 and 2 were both done on a Kansas ranch and ...
  • Perry, R.C.; Boyd, G.W.; Goehring, T.B.; Corah, L.R. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 2010-12-01)
    Four trials were conducted to evaluate the effectiveness of Melegestrol Acetate (MGA ®) and prostaglandin (PGF) in inducing and synchronizing estrus. In trial 1, treated heifers were fed MGA for 7 days and given a ...
  • Simms, D.D.; Sprott, L.R.; Odde, Kenneth G.; Corah, L.R. (Kansas State University. Agricultural Experiment Station, 2011-01-27)
    In 22 field trials involving 1,692 cattle, we evaluated Lutalyse as an estrus-synchronization agent for both natural mating and artificial insemination. Only 52.7% of the females in all 22 trials were cycling at the start ...
  • Johnson, Sandra K. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 2010-08-02)
    Three estrus-detection aids were evaluated in beef heifers after synchronization of estrus with a typical melengesterol acetate (MGA)/prostaglandin F2α (PGF) protocol. Devices were applied at the time of PGF administration. ...
  • Houghton, P.L.; Corah, L.R.; Goehring, T.B. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 2010-11-12)
    When fed MGA (0.5 mg.hd/day) for 14 days, followed by a prostaglandin injection 17 days later, a total of 736 out of 1112 heifers at 11 locations expressed signs of estrus within 5 days following the PG injection for a ...
  • Stevenson, Jeffrey S. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 2010-08-23)
    Body condition, parity, and days postpartum at the onset of the breeding season determine the proportion of cows that initiated first postpartum ovarian activity and ovulated before the start of the breeding season. Hormonal ...
  • Goehring, T.; Corah, L.; Higgins, James J. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 2010-12-01)
    A statistical analysis was used to determine which live animal traits are useful in predicting reproductive performance in first-calf heifers. Heifer condition score at calving and change in condition score postcalving, ...
  • Richardson, A.M.; Hensley, B.A.; Marple, T.J.; Johnson, Sandra K.; Stevenson, Jeffrey S. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 2010-08-06)
    Our objectives were to determine fertility of heifers after estrus synchronization using PGF2α preceded by either progesterone, GnRH, or both. Beef (n = 193) and dairy (n = 246) heifers were assigned randomly to three ...
  • Ward, S.; Odde, Kenneth G.; Kiracofe, G.; McKee, M. (Kansas State University. Agricultural Experiment Station, 2011-02-18)
    Weaning calves from cows that had not cycled after calving caused a higher percentage of cows to show estrous in the next 25 days than cows suckling calves. However, 78.3% of the nonsuckling cows had short cycles (7-10 ...
  • Johnson, Sandra K.; Bolte, J.W.; Jaeger, John R. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 2011-03-30)
    Routinely achieving pregnancy rates greater than 50% with fixed-time artificial insemination (AI) in heifers has been difficult. The Beef Reproduction Task Force recently added the intravaginal progesterone-releasing ...
  • Peters, C.W.; Larson, Robert L.; Corah, L.R. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 2010-10-05)
    Melengestrol acetate (MGA®) and prostaglandin F2α (PG; Lutalyse®) were used to synchronize estrus in 757 yearling, virgin, beef heifers on six commercial ranches. Heifers were inseminated artificially (AI) 12 h ...
  • Patterson, D.J.; Corah, L.R.; Brethour, J.R.; Negus, W.R. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 2010-12-01)
    Records of age at puberty (AAP) and postpartum interval to estrus (PPI) for heifers calving first at 2 years of age were used to determine the relationship between the two reproductive parameters. In Brahman x Hereford ...
  • Schalles, R.R.; Spire, M.; Clarke, Colleen Kay (Kansas State University. Agricultural Experiment Station, 2010-12-15)
    Heavy milking cows took longer to respond to estrus synchronization than light milking cows. There was no difference in response time between cows treated with Estrumate and Lutalyse. Cow weight, height or condition had ...
  • Heekin, M.D.; Kiracofe, G.H.; Schalles, R.R.; Ward, H.S. (Kansas State University. Agricultural Experiment Station, 2011-03-04)
    We used 76 cows to determine the effect of inseminating at different times after detecting estrus and to evaluate Synchronization B as an estrus synchronizing agent. Cows were divided into five groups: (1) nonsynchronized ...
  • Heekin, M.; Kiracofe, G.H.; Hultine, V.; Schalles, R.R.; McKee, R.M. (Kansas State University. Agricultural Experiment Station, 2011-03-04)
    We used 79 cows to evaluate Syncromate B (G.D. Searle, Co.) as an estrus-synchronizing agent. Management of five groups of cows was: (1) nonsynchronized, bred naturally; (2) nonsynchronized, bred artificially; (3) synchronized, ...
  • Heersche, G. Jr.; Kiracofe, G.; McKee, M.; Davis, Duane L.; Brower, G.R. (Kansas State University. Agricultural Experiment Station, 2011-03-08)
    Forty-seven of 50 heifers were in estrus 1 to 5 days after an injection of prostaglandin given when an ear implant of Synchro-mate B was removed. The implant had been in place one week. Thirty of the 47 (63.8%) heifers with ...

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