Browsing Dairy by Subject "GnRH"

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Browsing Dairy by Subject "GnRH"

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  • Stevenson, Jeffrey S.; Mee, M. O.; Call, Edward P. (Kansas Agricultural Experiment Station, 2011-08-02)
    Administering saline to 14 repeat breeders or 100 μg GnRH to 38 repeat breeders resulted in a greater (P=.07) proportion of pregnancies at 42 to 56 days after third service and fewer (P<.05) lost pregnancies during the ...
  • Stevenson, Jeffrey S. (Kansas Agricultural Experiment Station, 2011-08-02)
    These are somewhat exciting times for dairy producers because of the new arsenal of hormones available for controlling estrous cycles and improving fertility. Using Bovilene® seems to assist cows in releasing a retained ...
  • Buttery, B.S.; Burns, M.G.; Stevenson, Jeffrey S. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 2010-11-29)
    Experiments have shown human chorionic gonadotropin (hCG) to be more effective than gondadotropin releasing hormone (GnRH) as a means to ovulate follicles. Experiment 1 determined the effects of replacing the ...
  • Pursley, J.R.; Stevenson, Jeffrey S. (Kansas Agricultural Experiment Station, 2011-05-20)
    An experiment was conducted to examine the effects of GnRH on the secretion of FSH, LH, estradiol, and progesterone in serum and changes in ovarian structures. Dairy cows were assigned randomly to receive either 100 ...
  • Portaluppi, M.A.; Tenhouse, D.E.; Lloyd, A.; Eborn, D.R.; Kacuba, S.; DeJarnette, J.M; Stevenson, Jeffrey S. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 2010-11-29)
    We hypothesized that increasing concentrations of progesterone after artificial insemination (AI) would increase fertility. Our objective was to assess changes in ovarian structures, incidence of ovulation, and change in ...
  • Buttrey, B.S.; Burns, M.G.; Stevenson, Jeffrey S. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 2010-11-29)
    Experiments have shown human chorionic gonadotropin (hCG) to be more effective than GnRH as a means to induce ovulation of folli-cles. Dosages used, however, have differed greatly among experiments. A study was per-formed ...
  • Martel, C.A; Buttery, B.S.; Burns, M.G.; Brown, W.E.; Stevenson, Jeffrey S. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 2010-11-29)
    Our objective was to determine the effectiveness of exogenous progesterone in the form of an intravaginal insert (controlled internal drug release, CIDR) in conjunction with an ovulation synchronization protocol in lactating ...
  • Kobayashi, Y.; Stevenson, Jeffrey S. (Kansas Agricultural Experiment Station, 2011-05-12)
    Holstein cows and virgin heifers were treated with GnRH and PGF in a novel 2a ovulation synchronization protocol, which involves one fixed-time insemination. One injection of GnRH is given on a Monday morning, followed ...
  • Stevenson, Jeffrey S. (Kansas Agricultural Experiment Station and Cooperative Extension Service, 2011-07-22)
    Various programs of estrus synchronization have been tested during the last 6 years to determine the least costly and most efficacious for dairy heifer replacements. Four systems were tested: 1) a modified Ovsynch treatment ...
  • Stevenson, Jeffrey S. (Kansas Agricultural Experiment Station and Cooperative Extension Service., 2011-05-04)
    Management of the estrous cycle is now more practical than it was a decade ago because of our understanding of follicular waves. With availability of three gonadotropin-releasing hormone (GnRH) products and two ...

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