Search Results - "Legan, S.J."

Restricting feeding to the active phase in middle-aged mice attenuates adverse metabolic effects of a high-fat diet by Duncan, M.J, Smith, J.T, Narbaiza, J, Mueez, F, Bustle, L.B, Qureshi, S, Fieseler, C, Legan, S.J

“…Abstract Time-restricted feeding ameliorates the deleterious effects of a high-fat diet on body weight and metabolism in young adult mice. Because obesity is…”
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Effect of arousing stimuli on circulating corticosterone and the circadian rhythms of luteinizing hormone (LH) surges and locomotor activity in estradiol-treated ovariectomized (ovx+EB) Syrian hamsters by Legan, S.J., Peng, X., Yun, C., Duncan, M.J.

“…In most proestrous hamsters, novel wheel exposure phase advances activity rhythms and blocks the preovulatory LH surge, which occurs 2h earlier the next day…”
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Novel Wheel Running Blocks the Preovulatory Luteinizing Hormone Surge and Advances the Hamster Circadian Pacemaker by Legan, S.J, Franklin, K.M, Peng, X.-L, Duncan, M.J

“…In rodents, the preovulatory luteinizing hormone (LH) surge is timed by a circadian rhythm. We recently reported that a phenobarbital-induced delay of the…”
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Importance of estradiol and progesterone in regulating LH [luteinizing hormone] secretion and estrous behavior during the sheep estrous cycle by Karsch, F.J, Legan, S.J, Ryan, K.D, Foster, D.L

“…Replacement of the ovaries of sheep shortly after ovulation with Silastic implants that simulated the physiological patterns and levels of estradiol and…”
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Estrogen and progesterone do not activate Fos in AVPV or LHRH neurons in male rats by Hoffman, G.E., Le, W.W., Schulterbrandt, T., Legan, S.J.

“…In rodents, females but not males, in response to escalating levels of estrogen, express a luteinizing hormone (LH) surge that is prompted by a surge in…”
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Two effects of estradiol that normally contribute to the control of tonic LH [luteinizing hormone] secretion in the ewe by Goodman, R.L, Legan, S.J, Ryan, K.D, Foster, D.L, Karsch, F.J

“…Two effects of estradiol on tonic LH secretion in the ewe were observed when the steroidal milieu of the estrous cycle was reproduced in the absence of the…”
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Photoperiodic control of seasonal breeding in ewes: modulation of the negative feedback action of estradiol by Legan, S J, Karsch, F J

“…In ewes, a pivotal neuroendocrine event regulating seasonal breeding is a change in response of the hypothalamo-pituitary axis to the negative feedback action…”
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Patterns of circulating gonadotropins and ovarian steroids during the first periovulatory period in the developing sheep by Ryan, K.D. (University of Pittsburgh School of Medicine, Pittsburgh, PA), Goodman, R.L, Karsch, F.J, Legan, S.J, Foster, D.L

“…This report provides evidence that an increment in serum gonadotropin levels occurs at puberty in the sheep and that this reflects the critical hormonal event…”
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Does the seasonal increase in estradiol negative feedback prevent luteinizing hormone surges in anestrous ewes by suppressing hypothalamic gonadotropin-releasing hormone pulse frequence? by Legan, S.J, I'Anson, H, Fitzgerald, B.P, Fitzovich, D

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Changes in LH pulse frequency and serum progesterone concentrations during the transition to breeding season in ewes by I'Anson, H, Legan, S J

“…To characterize the changes in LH pulse frequency during the transition to breeding season, LH pulse patterns and serum progesterone profiles were determined…”
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Importance of retinal photoreceptors to the photoperiodic control of seasonal breeding in the ewe [Sheep reproductive cycles] by Legan, S.J, Karsch, F.J

“…Two experiments were performed to determine whether the eyes are necessary for photoperiodic control of reproduction in ewes. In the first, intact and…”
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Neuroendocrine regulation of the estrous cycle and seasonal breeding in the ewe by Legan, S J, Karsch, F J

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Does the first LH surge of the breeding season initiate the first full-length cycle in the ewe? by I'Anson, H, Legan, S J

“…To determine whether the first LH surge of the breeding season initiates a transient rise in progesterone in most ewes, serum progesterone (daily) and LH…”
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Changes in patterns of luteinizing hormone secretion before and after the first ovulation in the postpartum mare by FITZGERALD, B. P, I'ANSON, H, LEGAN, S. J, LOY, R. G

“…To determine whether luteinizing hormone (LH) secretion during the first estrous cycle postpartum is characterized by pulsatile release, circulating LH…”
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Role of gonadotropins and progesterone in determining the preovulatory estradiol rise in the ewe by Goodman, R L, Reichert, Jr, L E, Legan, S J, Ryan, K D, Foster, D L, Karsch, F J

“…The contributions of the follicular phase increase in LH and the decrease in progesterone to the determination of the preovulatory estradiol rise in the ewe…”
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