Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 63 for “"prepubertal"”.
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Ovarian sensitivity of the prepubertal ewe to exogenous gonadotropins
Ovulatory response of prepubertal ewe lambs of Booroola Merino x Rambouillet (F+) and Rambouillet (++) breeding was compared after administration of 500 IU PMSG, 750 IU hCG, a combination of PMSG and hCG (500 IU PMSG followed by 250 IU hCG), 4, 8, 20, 30 or 40 mg of ovine pituitary extract or 12 mg …
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Association of Fat Oxidation and Insulin Resistance in Prepubertal Children
… behind the development of metabolic disease in prepubertal children. The purpose of this study was to examine the association of fat oxidation with insulin resistance (IR) and insulin sensitivity (SI) in prepubertal children. A total of 34 prepubertal 7-9 year olds (18 females, 16 males, 13 …
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The Effects of Tamoxifen on Mammary Development in Prepubertal Heifers
… the effects on mammary gland development in prepubertal heifers given the anti-estrogen tamoxifen. Sixteen Holstein calves were randomly assigned to one of two treatment groups: tamoxifen-injected (TAM) or control (CON). Calves were subcutaneously injected daily from 28 to 120 days of age …
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Development of the induced gonadotropin surge mechanism in the prepubertal heifer
A longtitudinal study was performed in prepubertal heifer calves to determine when the individual components of the hypothalamic-pituitary-ovarian axis were capable of functioning. In study 1, the hypothalamus and anterior pituitary of prepubertal dairy heifers were challenged with exogenous …
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Diet and media components related to central adiposity in prepubertal children
… or in concert, affect central adiposity in prepubertal children. Our central hypothesis was that poor diet quality is related to increased central adiposity, independent of aerobic fitness. The aims of our study were to determine the relationships between: 1) media use and central adiposity; …
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Innate Immune Cells may be Involved in Prepubertal Bovine Mammary Development
… time, that innate immune cells are present in prepubertal bovine mammary tissue and that abundance is related to the epithelial structure. We suggest a possible role for these cells in control of bovine mammary development.
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Morphometric changes in the prepubertal rat thyroid gland following acute exposure to PCBs
Female rats subjected to a short-term immature rodent bioassay, developed to study the effects of polychlorinated biphenyls (PCBs), were further used to examine the effects of PCBs on thyroid glands through examination of serum thyroxine (T$\sb4$) and morphometry.
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Effects of varying energy intakes on mammary growth and development in prepubertal heifers
Rapid rearing of dairy heifers during late prepuberty has been linked to impairments in mammary development and reductions in milk yield. Our objective was to determine how varying energy intakes between 2 and 14 wk of age affect mammary parenchymal development. At 2 wk of age, Holstein calves were …
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Abundance and Localization of (Yes-associated protein) YAP in Prepubertal Bovine Mammary Tissue
… knowledge on fundamental aspects that govern prepubertal mammary development, scientists and farmers alike can ensure that heifers perform their best once they become cows. The Hippo pathway has been identified as an evolutionarily conserved pathway that regulates organ size in many animal …
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Dietary Fat and Sugar Induce Obesity and Impair Glucose Tolerance in Prepubertal Pigs
… associated with impaired glucose clearance. Prepubertal female pigs weaned at 21 d of age were fed control (CON), refined sugar (SUG), fat (FAT), and sugar-fat (SUGFAT) diets in a completely randomized arrangement for 16 wk. Calories from fat were 8.9% for CON, 5.6% for SUG, 35.5% for FAT and …
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Effects of Estradiol on Leydig Cell Function and Testicular Development in the Prepubertal Bull
One group (E, n = 5) of beef bull calves was implanted with estradiol-17$\beta$ (E$\sb2$) from birth to 39 weeks of age. A second group (P, n = 5) received placebo. A third (EH, n = 5) and fourth (PH, n = 5) group of bull calves were treated similarly except that they were challenged at 7, 22 and …
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Regulation of beef heifer productivity by dietary energy and prepubertal administration of bovine somatotropin
Weanling heifer calves (n = 452) grazed tall fescue pastures and were fed a high (H) or low (L) amount of corn supplement during a postweaning treatment period of 136 d. Postweaning gain of heifers receiving L and H was.43 and.62 kg/d, respectively. Heifers receiving H were heavier, and had more …
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Ovarian and Growth Hormone Regulation of Mammary Growth and Transcript Abundance in Prepubertal Dairy Heifers
… information on endocrine regulation during early prepubertal period is limited. Our overall objective was to study the regulation of mammary growth and development as well as transcript abundance in early prepubertal bovine mammary gland by ovarian secretions and exogenous bovine somatotropin …
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Effects of feeding level and diet composition on mammary growth in prepubertal lambs and mice
… in group R. In a second study, mammary growth in prepubertal mice increased with increasing dietary energy intake. Differences in ductal growth persisted at 18 weeks of age, and effects of exogenous steroids at this time were not significant. Prepubertal mammary growth in mice is not sensitive to …
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Treatment of prepubertal labial adhesions: a randomized, double-blinded trial comparing topical emollient versus topical estrogen
… a common finding estimated to occur in 22% of prepubertal girls. Symptoms are related to the accumulation of urine behind partially fused labia and include urinary tract infections, vulvovaginitis, pain with activity, post-void dripping of urine, and, in cases of complete labial fusion, urinary …
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The Influence of Gonadotropin-Releasing Hormone on Pubertal Development of Dairy Bulls (Reproduction, Prepubertal, Lh, Testosterone)
The purpose of this investigation was to determine if the administration of GnRH to immature Holstein bulls would increase the secretion of luteinizing hormone (LH), necessary for pubertal development. Preliminary experiments investigated the sensitivity of GnRH potency to storage up to one month …
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The Effects of Dietary Fructose and Fat on the Reproductive Parameters of Prepubertal and Pregnant Gilts
Body adiposity is generally considered the most pertinent factor in puberty attainment; however, recent data suggests that pre-pubertal reproductive tract development may be altered by dietary sugar consumption. Two experiments were conducted to delineate the direct effects of fructose on the …
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Effects of polychlorinated biphenyls (PCBs) on hepatic enzyme induction, uterotropic responses, and thyroid hormone levels in prepubertal female rats
A 2-day short-term bioassay, using prepubertal female Sprague-Dawley rats, was developed to study effects of polychlorinated biphenyls (PCBs) on hepatic enzyme induction, uterotropic responses, and thyroid hormone levels. Three approaches have been used to study the multiple effects of PCB …
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Effects of Maturity Level, Sex and Work Intensity on the Response of Selected Measures of Ventilatory, Metabolic and Circulatory Function to Prolonged Physical Activity in Children
… activity of mild and moderate intensity in prepubertal and adolescent children were investigated. Three questions were considered: (1) Do prepubertal and adolescent children respond, physiologically, in a similar manner to prolonged work?; (2) Is there a sex related difference in those …
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Assessment of Anthropometric Development of Transgender and Gender Non Binary Youth Assigned Female at Birth Across Prepubertal and Pubertal Growth
Objective: Growth and final height are impacted by many factors including sex steroids. Increasing numbers of transgender and gender non binary youth who are assigned female at birth (transmasculine (TM) youth) avoid puberty with endogenous hormones by utilizing gender affirming hormone therapies …
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