Browsing by Author "Stevenson, J.S."

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Browsing by Author "Stevenson, J.S."

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  • 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 ...
  • Milk progesterone kits: On-farm use
    Stevenson, J.S.; Call, E.P. (Kansas Agricultural Experiment Station, 1986)
    Diagnosing pregnancy in dairy cattle is an essential part of good management. The objective of this procedure is not to identify pregnant cows, but to identify the nonpregnant cows, those that become the breeding ...
  • Milking frequency, estradiol cypionate, and bST alters milk yield and reproductive outcomes in dairy cows
    Blevins, C.A.; Aberle, J.J.; Shirley, J.E.; Hensley, B.A.; Tiffany, S.M; Stevenson, J.S. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 2002)
    The objective of this study was to determine how milking frequency, estradiol cypionate (ECP) postpartum therapy given at 1 week after calving, and biweekly bovine somatotropin (bST) administration alter lactational ...
  • Milking twice daily in the presence of a cow’s own calf fails to prolong postpartum anestrus
    Lamb, G.C.; Lynch, J.M.; Miller, B.L.; Grieger, D.M.; Stevenson, J.S. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 1997)
    Six treatment s were initiated approximately 15 days after calving: 1) calf was weaned permanently from its dam (calf weaned; CW); 2) calf was present continuously with its dam but contact with the udder was prohibited ...
  • Milking two or five times daily in the presence of a cow’s own nonsuckling calf fails to prolong postpartum anovulation
    Lamb, G.C.; Thompson, K.E.; Heldt, J.S.; Löest, C.A.; Stevenson, J.S. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 1998)
    Three treatments were initiated at approximately 15 days after calving and continued for 4 weeks: 1) cows were suckled ad libitum by their calves (calf present [CP]); 2) calves were present but nonsuckling 24 hr/day and ...
  • A novel estrus-synchronization program for anestrous and cycling, suckled, beef cows
    Forbes, W.L.; Corah, L.R.; Grieger, D.M.; Thompson, K.E.; Lamb, G.C.; Stevenson, J.S. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 1997)
    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: ...
  • Observations with heatwatch to detect estrus by radiotelemetry in cattle
    Stevenson, J.S.; Smith, M.W.; Hoffman, D.P; Lamb, G.C.; Kobayashi, Y. (Kansas Agricultural Experiment Station, 1995)
    In Experiment 1, the effectiveness of two estrus-detection methods (visual observation vs radiotelemetric, pressure-sensitive, rumpmounted devices [HeatWatch®]) were compared in heifers. A pressure sensitive ...
  • One-day supplementation with tyrosine did not affect reproductive traits of sows
    Rettmer, I.; Goodband, R.D.; Stevenson, J.S.; Davis, D.L. (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service, 1991)
    Primiparous and multiparous sows received a single dietary supplement of L-tyrosine in their feed on the day after weaning, and the effects on various reproductive traits were evaluated. Sows received either none (control; ...