Jesse Riley Olsen

Stillwater Veterinary Clinic, P.C. · Absarokee, Montana

Adipose tissue is an active endocrine organ which secretes a wide range of hormones and protein factors, collectively termed adipokines. Adipokines affect appetite and satiety, glucose and lipid metabolism, inflammation and immune functions. The objectives were to evaluate serum concentrations of adipokines (adiponectin, leptin, tumor necrosis fact...

Exposing postpartum, anovular, suckled, beef cows to bulls reduces interval from calving to resumption of ovulatory cycles. Likewise, exposing, postpartum, anovular cows to excretory products of bulls for 12 h daily produces the same reduction in interval to resumption of ovulatory activity as the presence of bulls. Thus, the "biostimulatory effect...

The physiological mechanism by which bulls stimulate resumption of ovarian cycling activity in postpartum, anovular, suckled cows after calving may involve the concurrent activation of the hypothalamic-hypophyseal-ovarian (HPO) axis and hypothalamic-hypophyseal-adrenal (HPA) axis. Thus, the objectives of this experiment were to determine if charact...

The objective of this experiment was to determine if duration of daily bull exposure influences length of postpartum anestrus in primiparous, anovular, suckled, beef cows. The null hypotheses were that intervals from calving or the start of bull exposure (D 0) to resumption of ovulatory activity (OA), and proportions of cows that resumed OA during...

The biostimulatory effect of bulls to reduce the interval from calving to the resumption of luteal activity involves a change in the pulse frequency of LH. There is a possibility that pheromonal influence of the bull may alter metabolic hormones. Leptin, a metabolic hormone, is known to modulate activity of the hypothalamic-hypophyseal-ovarian axis...

Exposing postpartum, anovular, suckled, beef cows to bulls reduces interval from calving to resumption of ovulatory cycles. This "biostimulatory effect" of bulls appears to be associated with changes in cortisol concentrations that allow and increase LH pulse frequency. Changes in LH pulse frequency are necessary for follicular growth after diverge...

The objective was to evaluate if cortisol concentrations are associated with the resumption of luteal activity in postpartum, primiparous cows exposed to bulls. The hypotheses were that 1) interval from start of exposure to resumption of luteal activity; 2) proportions of cows that resumed luteal function during the exposure period; and 3) cortisol...

The objectives of this experiment were to compare estrous synchronization responses and AI pregnancy rates of beef heifers using protocols that included either CIDR or MGA as the progestin source. The hypotheses tested were that: (1) estrous synchronization responses after (a) progestin removal, and (b) PGF(2alpha); and, (2) AI pregnancy rates, do...

The objective of this experiment was to determine if the presence of bulls acutely alters the temporal cortisol concentrations in postpartum, anestrous, suckled beef cows. We tested the hypotheses that mean cortisol concentrations and characteristics of cortisol concentration patterns do not differ between cows exposed to bulls or steers. Primiparo...

The objective was to evaluate of cortisol concentration patterns in postpartum, anestrous, suckled beef cows during acclimatization to protocols necessary for intensive blood sampling. The null hypotheses were that characteristics of cortisol patterns do not differ throughout a 9 d intensive bleeding protocol. Body weight, BCS, dystocia score of co...

The objective was to compare the estrous synchronization response and AI pregnancy rates of primiparous, suckled beef cows using protocols that included controlled internal drug release devices (CIDR) for either 7 or 14 d, PGF2α (PG), timed AI (TAI) and GnRH. We tested the hypotheses that the estrous synchronization response after PG injection and...

There is a lack of data related to metabolites and metabolic hormones in pregnant elk (Cervus elaphus) and their association with season of the year. Thus, the objective of this study was to evaluate effects of season and pregnancy on energy-related metabolites and hormones in female elk of the Greater Yellowstone Ecosystem. The null hypotheses wer...