Browsing by Author "Lamb, G.C."

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Browsing by Author "Lamb, G.C."

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  • Resynchronization of estrus with progesterone and estrogen in previously inseminated beef cows
    Stevenson, J.S.; Medina-Britos, M.A.; Richardson, A.M.; Lamb, G.C.; Hensley, B.A.; Marple, T.J.; Johnson, S.J. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 2001)
    A study was conducted in 609 beef cows to determine whether or not estrus might be resynchronized in previously inseminated beef cows to accommodate a second artificial insemination (AI) early in the breeding season. ...
  • Site of semen deposition and fertility in lactating beef cows synchronized with GnRH and PGF2a
    Grieger, D.M.; Lamb, G.C.; Rozell, T.G.; Thompson, K.E.; Stevenson, J.S.; Anderson, K. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 1998)
    Our objective was to determine the effect of site of semen deposition on pregnancy rate in beef cows inseminated at a fixed time or after observed estrus. Cows were synchronized with a combination of gonadotropin-releasing ...
  • Supplemental progestin increases pregnancy rates in suckled beef cows
    Stevenson, J.S.; Lamb, G.C.; Grieger, D.M.; Cartmill, J.A.; Hensley, B.A.; El-Zarkouny, S.E.; Marple, T.J. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 2000)
    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 ...
  • Synchronizing estrus in replacement beef heifers using select synch, MGA, AND PGF2
    Stevenson, J.S.; Lamb, G.C.; Cartmill, J.A.; Hensley, B.A.; El-Zarkouny, S.; Heldt, J.S.; Marple, T.J. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 1999)
    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 ...
  • A three-year economic evaluation of a commercial heifer development program
    Lamb, G.C.; Lynch, J.M.; Miller, B.L.; Traffas, V.; Corah, L.R. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 1998)
    In 1994, 1995, and 1996, a commercial heifer development operation purchased a total of 1542 potential replacement heifers. Heifers were purchased in the fall proceeding the spring breeding season and fed a silage-based ...
  • Timing of gain does not alter puberty and reproductive performance of beef heifers fed a high-roughage diet
    Lynch, J.M.; Lamb, G.C.; Miller, B.L.; Minton, J.E.; Cochran, R.C.; Brandt, R.T. Jr. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 1996)
    Eighty crossbred heifers (549 lb initial body weight) were developed in drylot and limit-fed a forage sorghum silage diet predicted to produce gains of either 1 lb/day for the entire developmental period (EVENGAIN) or ...