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Seasonal fluctuations in the steady-state mRNA levels of suppressor of cytokine signaling-3 (SOCS-3) in the mammary gland of lactating and non-lactating ewes

Autor: Malgorzata Szczesna, D.A. Zieba, Katarzyna Kirsz, M. Kmiotek

Publikováno v: Small Ruminant Research. 124:101-104

Prolactin (PRL) is a hormone that plays a crucial role during pregnancy and lactation. The Janus kinase/signal transducer and activator of transcription (JAK/STAT) pathway, which is an important pathway in signal transduction from PRL to target cells

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::2f327a3e7f11f88c4827510a7c6798e0
https://doi.org/10.1016/j.smallrumres.2015.01.012

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Akademický článek

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Continuous administration of low-dose GnRH in mares

Autor: D.A. Zieba, Gary L. Williams, S.M. Collins

Publikováno v: Theriogenology. 68:673-681

We tested the hypothesis that continuous subcutaneous treatment with low-dose GnRH, administered to mares from late September/early October through March, would prevent the development of seasonal anovulation. Quarter Horse mares (n = 20) were strati

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b00487e06bbbbd6dc7d3cd360c1afe36
https://doi.org/10.1016/j.theriogenology.2007.05.057

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Chronic administration of recombinant ovine leptin in growing beef heifers: Effects on secretion of LH, metabolic hormones, and timing of puberty1

Autor: Marcel Amstalden, Duane H. Keisler, Gary L. Williams, M.N. Maciel, D.A. Zieba, Jairo Pereira Neves

Publikováno v: Journal of Animal Science. 82:2930-2936

Serum concentrations of leptin increase linearly from approximately 16 wk before until the week of pubertal ovulation in beef heifers. To test the hypothesis that exogenous leptin can hasten the onset of puberty in heifers, we examined the effects of

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::1072030c2901f43e2e00949582623237
https://doi.org/10.2527/2004.82102930x

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Regulatory Roles of Leptin at the Hypothalamic-Hypophyseal Axis Before and after Sexual Maturation in Cattle1

Autor: M.N. Maciel, Gary L. Williams, Duane H. Keisler, Marcel Amstalden, D.A. Zieba, S. Morton

Publikováno v: Biology of Reproduction. 71:804-812

Studies assessed, either directly or indirectly, the role of GnRH in leptin-mediated stimulation of LH release in cattle before and after sexual maturation. In experiment 1, the objectives were to determine whether leptin could acutely accelerate the

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::fa70c3c4c3b800e08e0d90fee6cf572c
https://doi.org/10.1095/biolreprod.104.028548

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Leptin Prevents Fasting-Mediated Reductions in Pulsatile Secretion of Luteinizing Hormone and Enhances Its Gonadotropin-Releasing Hormone-Mediated Release in Heifers1

Autor: D.A. Zieba, M.N. Maciel, Jairo Pereira Neves, Marcel Amstalden, Gary L. Williams, Duane H. Keisler

Publikováno v: Biology of Reproduction. 70:229-235

We tested the hypothesis that leptin could prevent fasting-mediated reductions in pulsatile secretion and modify GnRH-mediated release of LH in heifers approaching puberty. Thirteen crossbred, prepubertal heifers (13.5-16 mo; 280-350 kg) exhibiting f

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::aa6d4a14513e76ceec53f7e554a09dc1
https://doi.org/10.1095/biolreprod.103.021345

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Leptin Acts at the Bovine Adenohypophysis to Enhance Basal and Gonadotropin-Releasing Hormone-Mediated Release of Luteinizing Hormone: Differential Effects Are Dependent upon Nutritional History1

Autor: P.G. Harms, Marcel Amstalden, Thomas H. Welsh, D.A. Zieba, R. L. Stanko, John F. Edwards, Gary L. Williams

Publikováno v: Biology of Reproduction. 69:1539-1544

Recombinant ovine leptin (oleptin) stimulates an acute increase in the secretion of LH in fasted, but not in normal-fed, cows through an augmentation of the magnitude of individual pulses of LH. Herein, we tested the hypothesis that this effect could

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::5b43061373cf0fefd2f8e6d1661ea8ee
https://doi.org/10.1095/biolreprod.103.018119

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