D
D.A. Zieba
Researcher at Texas A&M University
Publications - 7
Citations - 513
D.A. Zieba is an academic researcher from Texas A&M University. The author has contributed to research in topics: Leptin & Luteinizing hormone. The author has an hindex of 7, co-authored 7 publications receiving 496 citations. Previous affiliations of D.A. Zieba include University of Agriculture, Faisalabad.
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Journal ArticleDOI
Regulatory roles of leptin in reproduction and metabolism: a comparative review.
TL;DR: Mechanisms through which undernutrition hypersensitize the hypothalamic-gonadotropic axis to leptin may involve up-regulation of the LR; however, an increase in LR mRNA expression is not a requisite feature of heightened adenohypophyseal responses in fasted cattle.
Journal ArticleDOI
Effects of leptin on basal and GHRH-stimulated GH secretion from the bovine adenohypophysis are dependent upon nutritional status.
D.A. Zieba,Marcel Amstalden,S. Morton,J L Gallino,John F. Edwards,P.G. Harms,Gary L. Williams +6 more
TL;DR: Results show that leptin can act directly at the anterior pituitary level to modulate GH release, and this effect is dependent upon nutritional history.
Journal ArticleDOI
Chronic administration of recombinant ovine leptin in growing beef heifers: effects on secretion of LH, metabolic hormones, and timing of puberty.
M.N. Maciel,M.N. Maciel,D.A. Zieba,Marcel Amstalden,Duane H. Keisler,Jairo Pereira Neves,Gary L. Williams +6 more
TL;DR: Chronic administered leptin failed to induce puberty or alter endocrine characteristics in beef heifers nearing the time of expected puberty, and there was an overall effect on the frequency of LH pulses.
Journal ArticleDOI
Regulatory Roles of Leptin at the Hypothalamic-Hypophyseal Axis Before and after Sexual Maturation in Cattle
TL;DR: Results indicate that leptin is unable to accelerate the pulse generator in heifers at any developmental stage, however, leptin-mediated augmentation of LH concentrations and pulse amplitude in the nutritionally stressed, mature female are associated with modifications in GnRH secretory dynamics.
Journal ArticleDOI
Leptin acts at the bovine adenohypophysis to enhance basal and gonadotropin-releasing hormone-mediated release of luteinizing hormone: differential effects are dependent upon nutritional history.
Marcel Amstalden,D.A. Zieba,John F. Edwards,P.G. Harms,Thomas H. Welsh,R. L. Stanko,R. L. Stanko,Gary L. Williams +7 more
TL;DR: The hypothesis that leptin modulates the secretion of LH in mature cows, to a large extent, by its direct actions at the adenohypophyseal level is supported.