Search Results - "Turzillo, A M"

Differentiation of Dominant Versus Subordinate Follicles in Cattle by FORTUNE, J. E, RIVERA, G. M, EVANS, A. C. O, TURZILLO, A. M

“…Selection of a dominant follicle, capable of ovulating, from among a cohort of similarly sized follicles is a critical transition in follicular development…”
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Effect of Gonadotropin-Releasing Hormone (GnRH) Pulse Frequency on Serum and Pituitary Concentrations of Luteinizing Hormone and Follicle-Stimulating Hormone, GnRH Receptors, and Messenger Ribonucleic Acid for Gonadotropin Subunits in Cows by Vizcarra, J. A., Wettemann, R. P., Braden, T. D., Turzillo, A. M., Nett, T. M.

“…Abstract Thirty-two nutritionally anestrous cows were used to determine the effect of the frequency of exogenous GnRH pulses on ovarian follicular growth,…”
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Pituitary effects of steroid hormones on secretion of follicle-stimulating hormone and luteinizing hormone by Nett, T.M, Turzillo, A.M, Baratta, M, Rispoli, L.A

“…Steroid hormones have a profound influence on the secretion of the gonadotropins, follicle-stimulating hormone (FSH) and luteinizing hormone (LH). These…”
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role of thecal androgen production in the regulation of estradiol biosynthesis by dominant bovine follicles during the first follicular wave by Valdez, K. E, Cuneo, S. P, Gorden, P. J, Turzillo, A. M

“…The first wave of follicular development following ovulation in cattle is characterized by selection and growth of a large, estrogenic dominant follicle. After…”
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Activin Modulates Differential Effects of Estradiol on Synthesis and Secretion of Follicle-Stimulating Hormone in Ovine Pituitary Cells by BARATTA, M, WEST, L. A, TURZILLO, A. M, NETT, T. M

“…In several physiological paradigms, secretion of FSH and LH are not coordinately regulated. Because these hormones appear to be produced by a single cell type…”
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Hormonal regulation of messenger ribonucleic acid encoding steroidogenic acute regulatory protein in ovine corpora lutea by Juengel, J L, Meberg, B M, Turzillo, A M, Nett, T M, Niswender, G D

“…Steroidogenic acute regulatory protein (StAR), proposed to be involved in the transport of cholesterol to the inner mitochondrial membrane, has recently been…”
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Pulsatile gonadotropin-releasing hormone (GnRH) increases concentrations of GnRH receptor messenger ribonucleic acid and numbers of GnRH receptors during luteolysis in the ewe by Turzillo, A.M. (Colorado State University, Fort Collins, CO.), Juengel, J.L, Nett, T.M

“…As circulating concentrations of progesterone decrease during the early preovulatory period, concentrations of mRNA encoding ovine GnRH receptor in the…”
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Suppression of the secondary FSH surge with bovine follicular fluid is associated with delayed ovarian follicular development in heifers by Turzillo, A M, Fortune, J E

“…Holstein heifers were given 5 injections (twice/day) of 10 ml charcoalextracted bovine follicular fluid (bFF; N = 6) or 10 ml saline (N = 5) beginning 12 h…”
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Regulation of ovine GnRH receptor gene expression by progesterone and oestradiol by Turzillo, A M, Clapper, J A, Moss, G E, Nett, T M

“…The objective of this study was to determine whether progesterone prevents the stimulatory effects of oestradiol on GnRH receptor gene expression. In Expt 1,…”
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Effects of bovine follicular fluid and passive immunization against gonadotropin-releasing hormone (GnRH) on messenger ribonucleic acid for GnRH receptor and gonadotropin subunits in ovariectomized ewes by Turzillo, A.M, Nett, T.M

“…In cultured ovine pituitary cells, inhibin increases concentrations of mRNA encoding GnRH receptor and numbers of GnRH receptors. The objective of this study…”
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Effects of suppressing plasma FSH on ovarian follicular dominance in cattle by Turzillo, A M, Fortune, J E

“…The importance of FSH during development of the dominant follicle of the first wave of follicular growth in cattle was assessed by injecting heifers twice…”
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Steady-state concentrations of mRNA encoding two inhibitors of protein kinase C in ovine luteal tissue by Juengel, J L, Melner, M H, Clapper, J A, Turzillo, A M, Moss, G E, Nett, T M, Niswender, G D

“…Prostaglandin F 2α (PGF 2α ) decreases secretion of progesterone from the corpus luteum in domestic ruminants. However, it is less effective during the early…”
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Messenger ribonucleic acid for gonadotropin-releasing hormone receptor and numbers of gonadotropin-releasing hormone receptors in ovariectomized ewes after hypothalamic-pituitary disconnection and treatment with estradiol by Turzillo, A.M. (Colorado State University, Fort Collins.), DiGregorio, G.B, Nett, T.M

“…To study the regulation of ovine GnRH receptors in the absence of GnRH, hypothalamic input was removed by hypothalamic-pituitary disconnection (HPD)…”
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Regulation of gonadotropin-releasing hormone (GnRH) receptor messenger ribonucleic acid and GnRH receptors during the early preovulatory period in the ewe by Turzillo, A M, Campion, C E, Clay, C M, Nett, T M

“…Estradiol increases the number of GnRH receptors in the ewe. Although results from studies conducted in vitro indicate that progesterone may have a negative…”
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Regulation of genes encoding steroidogenic factor-1 (SF-1) and gonadotropin subunits in the ovine pituitary gland by Baratta, M., Turzillo, A.M., Arreguin-Arevalo, A., Clay, C.M., Nett, T.M.

“…Steroidogenic factor-1 (SF-1) is a transcription factor originally characterized as a mediator of gene expression in steroidogenic tissues. Studies in SF-1…”
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Regulation of gonadotropin-releasing hormone (GnRH) receptor gene expression in sheep: interaction of GnRH and estradiol by Turzillo, A M, Nolan, T E, Nett, T M

“…GnRH and estradiol are important regulators of GnRH receptors. When delivered to the anterior pituitary gland continuously, GnRH decreases numbers of GnRH…”
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Regulation of GnRH receptor gene expression in sheep and cattle by Turzillo, A M, Nett, T M

“…The GnRH receptor plays a pivotal role in reproduction. This review summarizes current knowledge of the regulation of GnRH receptor gene expression by…”
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Effects of estradiol on concentrations of gonadotropin-releasing hormone receptor messenger ribonucleic acid following removal of progesterone by Turzillo, A M, Nett, T M

“…To test the hypothesis that low levels of estradiol are sufficient to increase concentrations of GnRH receptor mRNA in the absence of progesterone, ewes were…”
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Follicle selection in domestic ruminants by Fortune, J E, Sirois, J, Turzillo, A M, Lavoir, M

“…Ultrasound imaging has shown that cattle exhibit 2 or 3 waves of follicular development during an oestrous cycle. The waves consist of the contemporaneous…”
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The role of thecal androgen production in the regulation of estradiol biosynthesis by dominant bovine follicles during the first follicular wave1,2 by Valdez, K. E., Cuneo, S. P., Gorden, P. J., Turzillo, A. M.

“…The first wave of follicular development following ovulation in cattle is characterized by selection and growth of a large, estrogenic dominant follicle. After…”
Get full text