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Showing 1 to 20 of 73 for “"estrous cycle"”.
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Ascorbic acid and the reproductive cycle : ascorbic acid and the estrous cycle
Thesis (M.S.)--Michigan State University. Dept. of Food Science and Human Nutrition, 1974
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Determination of an Estrous Cycle in Female Giraffes (Giraffa Camelopardalis) By Radioimmunoassay of Fecal Hormones
The ability to detect reproductive cycles, specifically, the day of estrus, in giraffes has typically been done by observing male behavior. More accurate methods, such as analysis of serum and urine samples, have not been utilized due to the uncooperative nature of the species. Fecal sample …
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Variation in Social Behavior Throughout the Estrous Cycle of a Captive Killer Whale <i>Orcinus orca</i>
… The present study examined the influence of the estrous cycle of a captive female killer whale on the rate, duration, initiation and reception of social behavior she performed with her only pool mate, a male Atlantic bottlenose dolphin. Although these two delphinid species do not commonly …
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Evaluation of the Hypothalamic Kisspeptin System Throughout the Estrous Cycle and During the Attainment of Puberty in Gilts
… kisspeptin system throughout various days of the estrous cycle and 2) the hypothalamic kisspeptin system during the peripubertal period in gilts. In experiment 1, 40 crossbred gilts (191 d, 121 kg) were administered an intramuscular injection of PG600. Twelve days after the administration of …
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Relationship Between Physical Activity, Stage of Estrous Cycle, Sexual Behavior and Plasma Luteinizing Hormone in Dairy Cattle (Electronic Pedometers)
Detection of estrus remains as one of the major factors affecting reproductive performance in dairy cattle. Use of electronic equipment such as programmable electronic pedometers may assist detecting changes in physical activity that occur during the day of estrus in cattle.
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Evaluation of uterine lumenal proteins in dairy cattle at known stages of the estrous cycle and in ovarian steroid treated ovariectomized cows
The uterine protein milieu of cyclic and ovariectomized (ovx) cows treated with estradiol-17S (E-2) and progesterone (P) alone or in combination was studied by various biochemical methods. Uterine lumenal fluids (UF) were collected nonsurgically via a foley catheter. Sephacryl S-200 chromatography …
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Effect of naloxone on serum luteinizing hormone concentrations during the early postpartum period and the estrous cycle in primiparous and multiparous holstein cows
… periods after parturition and two phases of the estrous cycle. In experiment 1, 24 cows (12 primiparous; 12 multiparous) received either saline (n = 12) or 1 mg/kg naloxone (n = 12) i. v. at 14 1 days postpartum. Blood samples were collected at 15-minute intervals for 2 hours before and 2.5 hours …
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Role of Endogenous Dopamine in Regulation of Anterior Pituitary Hormone Secretion During Early Postpartum and Various Stages of the Estrous Cycle in Holstein Cows
… postpartum period and various stages of the estrous cycle was investigated in Holstein cows. Experiment 1 was conducted in anovulatory early postpartum cows. Fluphenazine caused a decrease (P < .05) in mean serum LH concentration and LH pulse frequency. Likewise, FLU caused a (P < .05) …
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Prostaglandin metabolism in the ovine corpus luteum
… mechanisms allow the corpus luteum early in the estrous cycle and early in pregnancy to be resistant to the luteolytic activity of PGF2α?". Two potential mechanisms were addressed, decreased synthesis of PGF2α and catabolism of PGF2α in the corpus luteum. The first hypothesis tested was: "PGDH …
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Disrupted female reproductive cyclicity and gonadotropin-releasing hormone neuron dysfunction in a mouse model of temporal lobe epilepsy
… 60% percent of KA-injected mice showed disrupted estrous cycles, typically characterized by increased estrous cycle length and increased time spent in diestrus estrus by 42 days post-KA injection. Hypothalamic gonadotropin-releasing hormone (GnRH) neurons are key players in the neural control of …
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Progesterone and Prolactin Profiles of the Female Asian Elephant (Elephas Maximus)
… daily (around estrus), weekly (throughout the estrous cycle), and bimonthly (during gestation) in 8 female Asian elephants. A total of 18 estrous cycles with 4 resulting in conception are described. Early gestational values are shown in 4 animals, with 2 animals followed to term. Serum …
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Evaluation of the 7 and 7 synch protocol for control of the estrous cycle among beef cows prior to fixed-time artificial insemination with sex-sorted or conventional semen
… h: 76 percent [158/209]). Additionally, P/AI of estrous cows inseminated with sex-sorted semen did not differ between treatments (66 h: 45 percent [68/146]; 72 h: 40 percent [63/158]). In conclusion, later timing of FTAI following the 7 and 7 Synch protocol failed to improve P/AI of estrous cows …
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Differential effect of melengestrol acetate or progesterone-releasing intravaginal devices on follicular development, progesterone and estradiol-17β concentrations and patterns of luteinizing hormone release during the bovine estrous cycle
… MGA or PRID treatment initiated on d 17 of the estrous cycle altered: 1) follicular development, 2) estradiol-17β (E2) and progesterone (P4) concentrations, and 3) patterns of release of luteinizing hormone (LH). In both studies, Angus, Angus x Holstein or Holstein cows 2 to 6 yr of age were …
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Effects of NMDA Receptor Antagonists on the Differential-Reinforcement-of-Low-Rate 72 Second (DRL 72) Responding in Rats
… trials. Sex differences and the effect of estrous cycle on differential-reinforcement-of-low-rate 72 second (DRL72) responding have yet to be examined. The aim of the present study was to extend the preclinical antidepressant evidence of dextromethorphan and evaluate sex and estrous cycle …
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The role of progesterone receptor in hypothalamic kisspeptin neurons
… in the ovary and therefore may lead to a vicious cycle. There is no literature regarding whether the development of polycystic ovaries is structurally reversible, a question that may have great impact on the understanding of the pathogenesis of this condition. GnRH activates the reproductive axis …
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