Browsing by Author "Stevenson, J.S."

K-REx Repository

Browsing by Author "Stevenson, J.S."

Sort by: Order: Results:

  • Gonadotropin-releasing hormone and conception of Holstein cows
    Stevenson, J.S.; Schmidt, M.K.; Call, E.P. (Kansas Agricultural Experiment Station, 1984)
    To study the effects of gonadotropin-releasing hormone (GnRH) and timing of artificial insemination (Al) on fertility, 328 dairy cows were divided into four groups. Inseminations at first, second, or third service were ...
  • Gonadotropin-releasing hormone improves conception rates of repeat-breeders with previous reproductive disorders
    Stevenson, J.S.; Call, E.P. (Kansas Agricultural Experiment Station, 1987)
    An experiment examining the benefit of treating repeat-breeders with 100 µg GnRH (Cystorelin ®) at the time of third or fourth insemination was conducted in 513 dairy cows of which 93 (abnormal cows) had been diagnosed ...
  • Growth, carcass and boar-odor traits in male pigs fed altrenogest
    Stevenson, J.S.; Kluber, E.F. III; Minton, J.E.; Davis, D.L.; Hunt, M.C.; Nelssen, J.L.; Pollmann, D.S. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 1986)
    Two experiments were conducted to examine the effects of a synthetic progestogen (altrenogest) on growth and carcass characteristics of boars. Altrenogest inhibited both the growth of the testes and the pubertal rise in ...
  • Hormonal and behavioral characteristics associated with the onset of radiotelemetric-detected estrus
    Stevenson, J.S.; Lamb, G.C.; Hoffman, D.P.; Kobayashi, Y. (Kansas Agricultural Experiment Station, 1996)
    The objective of this study was to examine changes in ovarian steroids in relation to the onset of first standing estrus detected by pressure-sensitive rump-mounted devices (ABS HeatWatch® [HW]). Twenty Holstein ...
  • Housing sows after weaning: re-establishment of estrus and subsequent reproduction
    Schmidt, W.E.; Davis, D.L.; Stevenson, J.S. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 1983)
    We penned sows after weaning either in groups of 4 or 5 or individually in gestation stalls. Beginning 3 days after weaning sows were checked twice daily and artificially inseminated 24 and 36 hr after first detected ...
  • How does cow-calf association inhibit the onset of estrous cycles after calving?
    Stevenson, J.S.; Minton, J.E.; Knoppel, E.L.; Stewart, R.E.; Viker, S.D.; Kiracofe, G.H. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 1993)
    The "suckling response" maintains anestrus in beef cows for about 40 to 60 days postpartum. The suckling response remains intact in mastectomized cows, so stimulation of the inguinal area, and not milk flow or ...
  • Human chorionic gonadotropin and GnRH effects on pregnancy survival in pregnant cows and resynchronized pregnancy rates
    Stevenson, J.S.; Buttery, B.S.; Burns, M.G. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 2007)
    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 ...
  • Increasing litter size in swine herds
    Davis, D.L.; Stevenson, J.S.; Minton, J.E. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 1987)
    Management and biological factors combine to limit litter size in swine herds. With present technology, improving litter size depends upon increasing the number born in the first litter and prolonging sow longevity. Methods ...
  • Increasing milking frequency in fresh cows: milk characteristics and reproductive performance
    Stevenson, J.S.; Shirley, J.E. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 2003)
    Increased milking frequency during partial or whole lactations increases milk yields, but generally reduces percentages of milk fat and protein. Because of greater milk volume, total fat and protein are not reduced. ...
  • Induction of estrus in thyroidectomized-ovariectomized, nonlactating, holstein cows
    Stewat, R.E.; Stevenson, J.S.; Mee, M.O.; Rettmer, I. (Kansas Agricultural Experiment Station, 1992)
    Low thyroid activity (hypothyroidism) has been reported to decrease sexual behavior associated with reproduction in several species. Using estradiol benzoate (EB) and progesterone (P ), we attempted to induce 4 estrus ...
  • Induction of fertile estrus during lactation in sows
    Stevenson, J.S.; Davis, D.L. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 1983)
    Our objective was to determine the effectiveness of inducing estrus during lactation by reducing the nursing load of the sow between 2 and 4 weeks after farrowing. lactating sows were separated from their litters for ...
  • Influence of multiple daily injections of oxytocin on reproductive and milk characteristics of postpartum dairy cows
    Stewart, R.E.; Stevenson, J.S. (Kansas Agricultural Experiment Station, 1986)
    Release of oxytocin at the time of suckling or milking may delay onset of estrous cycles in postpartum cows. Twenty lactating Holsteins were used in this study to determine if multiple daily injections of oxytocin would ...
  • Influence of prebreeding progesterone plus prostaglandin F2-alpha on estrus and fertility in lactating dairy cows
    Mee, M.O.; Stewart, R.E.; Stevenson, J.S.; Call, E.P. (Kansas Agricultural Experiment Station, 1987)
    Progesterone administered before breeding may increase estrous expression and subsequent fertility in lactating dairy cows. Holstein cows (n=302) were assigned randomly at calving to three groups. Cows received no ...
  • Influence of source and amount of dietary protein on the performance and reproductive function of first-calf heifers
    Rusche, W.C.; Cochran, R.C.; Corah, L.R.; Stevenson, J.S.; Harmon, D.L. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 1992)
    Increasing the amount of dietary protein above the NRC requirement increased weight gain of nursing first-calf heifers. Feeding a protein source with higher ruminal escape potential and increasing protein in the diet ...
  • Influence of supplemental light on sow performance during and after lactation
    Stevenson, J.S.; Pollmann, D.S.; Davis, D.L.; Murphy, J.P. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 1982)
    A study involving 327 crossbred sows was conducted to determine whether providing supplemental light in farrowing rooms would influence litter weight, number of pigs weaned, piglet survival rate, and subsequent rebreeding ...
  • Inseminations at estrus induced by the presynch protocol before timed artification insemination
    Stevenson, J.S.; Phatak, A.P. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 2004)
    A controlled field study examined conception rates after two timed-AI (TAI) breeding protocols conducted on two commercial dairy farms. Estrous cycles in postpartum lactating cows were presynchronized with two ...
  • Introducing a computer feeding system at various lactational stages for dairy cows
    Kube, J.C.; Shirley, J.E.; Frantz, K.D.; Stevenson, J.S. (Kansas Agricultural Experiment Station, 1986)
    Lactating dairy cows were introduced to a computer feeder in early (≤120 days in milk or D.I.M.), mid (120-220 D.I.M.), and late (>220 D.I.M.) lactation. Cows in the mid- and late-lactation groups adjusted quicker and ...
  • Litter size in gilts after altrenogest and flushing
    Davis, D.L.; Stevenson, J.S.; Pollmann, D.S.; Allee, G.L. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 1984)
    Effects of estrous synchronization and flushing on litter size in gilts were compared on two farms. Estrus in gilts was synchronized with altrenogest for 14 days or estrous cycles were left unaltered (control group). ...
  • Litter traits for gilts fed 4 or 7.4 lb feed during the first ten days after breeding
    Davis, D.L.; Zhang, Z.; Stevenson, J.S. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 1988)
    We tested the effects of feeding 4 or 7.4 lb of a complete gestation diet to gilts during days 0 to 2 or 3 to 10 after first detected estrus (day 0) and mating. There was a tendency (P = .11) for the 7.4 lb/day treatment ...
  • Management strategies: reproduction
    Smith, J.F.; Stevenson, J.S. (Kansas Agricultural Experiment Station, 1995)
    Despite the negative effects of milk production on some reproductive traits, calving intervals between high- and low-producing groups varied by only 9 days (414 vs 423). First-service conception rates were 8 ...