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Estrus cycle

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https://www.readbyqxmd.com/read/28237410/glucagon-like-peptide-1-glp-1-increases-in-plasma-and-colon-tissue-prior-to-estrus-and-circulating-levels-change-with-increasing-age-in-reproductively-competent-wistar-rats
#1
Michelle L Johnson, M Jill Saffrey, Victoria J Taylor
There is a well-documented association between cyclic changes to food intake and the changing ovarian hormone levels of the reproductive cycle in female mammals. Limited research on appetite-controlling gastrointestinal peptides has taken place in females, simply because regular reproductive changes in steroid hormones present additional experimental factors to account for. This study focussed directly on the roles that gastrointestinal-secreted peptides may have in these reported, naturally occurring, changes to food intake during the rodent estrous cycle and aimed to determine whether peripheral changes occurred in the anorexigenic (appetite-reducing) hormones peptide-YY (PYY) and glucagon-like peptide-1 (GLP-1) in female Wistar rats (32-44 weeks of age)...
February 22, 2017: Peptides
https://www.readbyqxmd.com/read/28237341/onset-of-luteolytic-action-of-exogenous-prostaglandinf-2%C3%AE-during-estrous-cycle-in-goats
#2
Juan E Romano, Abdalhamid Alkar, Marcel Amstalden
The objectives of these two experiments were to determine the day of onset of luteolysis after exogenous PGF-2α administration during the estrous cycle and the fertility of this synchronized estrus in goats. In the first experiment, during the breeding season, 48 Nubian does were estrous synchronized, using intravaginal sponges impregnated with a progestin, and estrus was detected by vasectomized bucks. The does were divided at random into three groups of 16 does each to be treated at days 2, 3, and 4 of the estrous cycle (estrus = day 0)...
April 1, 2017: Theriogenology
https://www.readbyqxmd.com/read/28230329/integrating-trans-abdominal-ultrasonography-with-fecal-steroid-metabolite-monitoring-to-accurately-diagnose-pregnancy-and-predict-the-timing-of-parturition-in-the-red-panda-ailurus-fulgens-styani
#3
Erin Curry, Lissa J Browning, Paul Reinhart, Terri L Roth
Red pandas (Ailurus fulgens styani) exhibit a variable gestation length and may experience a pseudopregnancy indistinguishable from true pregnancy; therefore, it is not possible to deduce an individual's true pregnancy status and parturition date based on breeding dates or fecal progesterone excretion patterns alone. The goal of this study was to evaluate the use of transabdominal ultrasonography for pregnancy diagnosis in red pandas. Two to three females were monitored over 4 consecutive years, generating a total of seven profiles (four pregnancies, two pseudopregnancies, and one lost pregnancy)...
February 23, 2017: Zoo Biology
https://www.readbyqxmd.com/read/28228001/fabrication-of-progesterone-loaded-nanofibers-for-the-drug-delivery-applications-in-bovine
#4
Chitra Karuppannan, Mehnath Sivaraj, J Ganesh Kumar, Rangasamy Seerangan, S Balasubramanian, Dhinakar Raj Gopal
Progesterone is a potent drug for synchronization of the estrus and ovulation cycles in bovine. At present, the estrus cycle of bovine is controlled by the insertion of progesterone-embedded silicone bands. The disadvantage of nondegradable polymer inserts is to require for disposal of these bands after their use. The study currently focuses on preparation of biodegradable progesterone-incorporated nanofiber for estrus synchronization. Three different concentrations (1.2, 1.9, and 2.5 g) of progesterone-impregnated nanofibers were fabricated using electrospinning...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28219466/factors-of-importance-when-selecting-sows-as-embryo-donors
#5
A Nohalez, C A Martinez, J Reixach, M Diaz, J Vila, I Colina, I Parrilla, J L Vazquez, J Roca, M A Gil, H Rodriguez-Martinez, E A Martinez, C Cuello
The improvement in porcine embryo preservation and non-surgical embryo transfer (ET) procedures achieved in recent years represents essential progress for the practical use of ET in the pig industry. This study aimed to evaluate the effects of parity, weaning-to-estrus interval (WEI) and season on reproductive and embryonic parameters at day 6 after insemination of donor sows superovulated after weaning. The selection of donor sows was based on their reproductive history, body condition and parity. The effects of parity at weaning (2 to 3, 4 to 5 or 6 to 7 litters), season (fall, winter and spring), and WEI (estrus within 3 to 4 days), and their interactions on the number of corpus luteum, cysts in sows with cysts, number and quality of viable and transferable embryos, embryo developmental stage and recovery and fertilization rates were evaluated using linear mixed effects models...
February 21, 2017: Animal: An International Journal of Animal Bioscience
https://www.readbyqxmd.com/read/28216407/multidrug-resistance-transporter-1-and-breast-cancer-resistance-protein-protect-against-ovarian-toxicity-and-are-essential-in-ovarian-physiology
#6
Lynae M Brayboy, Nathalie Oulhen, Sokunvichet Long, Niesha Voigt, Christina Raker, Gary M Wessel
Ovarian protection from chemotoxicity is essential for reproductive health. Our objective is to determine the role of ATP-dependent, Multidrug Resistance Transporters (MDRs) in this protection. Previously we identified MDR-dependent cytoprotection from cyclophosphamide in mouse and human oocytes by use of MDR inhibitors. Here we use genetic deletions in MDR1a/b/BCRP of mice to test MDR function in ovarian somatic cells and find that mdr1a/b/bcrp-/- mice had significantly increased sensitivity to cyclophosphamide...
February 12, 2017: Reproductive Toxicology
https://www.readbyqxmd.com/read/28208728/parabens-accelerate-ovarian-dysfunction-in-a-4-vinylcyclohexene-diepoxide-induced-ovarian-failure-model
#7
Jae-Hwan Lee, Myeongho Lee, Changhwan Ahn, Hee Young Kang, Dinh Nam Tran, Eui-Bae Jeung
Parabens are widely used preservatives in basic necessities such as cosmetic and pharmaceutical products. In previous studies, xenoestrogenic actions of parabens were reported in an immature rat model and a rat pituitary cell line (GH3 cells). The relationship between parabens and ovarian failure has not been described. In the present study, the influence of parabens on ovarian folliculogenesis and steroidogenesis was investigated. A disruptor of ovarian small pre-antral follicles, 4-vinylcyclohexene diepoxide (VCD, 40 mg/kg), was used to induce premature ovarian failure (POF)...
February 8, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28181120/comparison-of-three-superovulation-protocols-with-or-without-gnrh-treatment-at-the-time-of-artificial-insemination-on-ovarian-response-and-embryo-quality-in-thai-native-heifers
#8
Vibuntita Chankitisakul, Jakkhaphan Pitchayapipatkul, Phirawit Chuawongboon, Dumrongrak Rakwongrit, Denpong Sakhong, Wuttigrai Boonkum, Thevin Vongpralub
To optimize the superovulation protocol in Thai native cattle, the present research was designed to (1) compare three different protocols designed to induce superstimulation and (2) study the effect of gonadotropin-releasing hormone (GnRH) administration at insemination time (to induce ovulation) on ovarian follicular activities in terms of the number of large follicles, corpora lutea (CLs) and unovulated follicles, and the number and quality of ova/embryos recovered in Thai native heifers. Initially, the estrous cycles of animals (n = 36) at unknown stages were synchronized by two prostaglandin F2α (PGF2α) injections at an interval of 12 days...
March 2017: Tropical Animal Health and Production
https://www.readbyqxmd.com/read/28174048/the-effects-of-particulate-matter-on-inflammation-of-respiratory-system-differences-between-male-and-female
#9
Kelly Yoshizaki, Jôse Mára Brito, Luiz Fernando Silva, Adriana Lino-Dos-Santos-Franco, Daniela Perroni Frias, Renata Calciolari Rossi E Silva, Luís Fernando Amato-Lourenço, Paulo Hilário Nascimento Saldiva, Iolanda de Fátima Lopes Calvo Tibério, Thais Mauad, Mariangela Macchione
Air pollution is known to exacerbate respiratory diseases and epidemiological studies have shown that women present more chronic respiratory symptoms than man exposed to traffic pollution, however, the reason why is unclear. This study evaluated the inflammatory differences in BALB/c mouse males (n=34) and females (n=111) in three phases of the estrous cycle that were exposed to ambient air (AA) or concentrated ambient particles (CAPs). Tracheal hyperreactivity to methacholine, bronchoalveolar lavage fluid (BALF) and immunohistochemical of airways and lung parenchyma were studied...
February 4, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28166989/dose-dependent-inhibition-of-uterine-contractility-by-nitric-oxide-a-potential-mechanism-underlying-persistent-breeding-induced-endometritis-in-the-mare
#10
Firdous A Khan, Tracey S Chenier, Coral L Murrant, Robert A Foster, Joanne Hewson, Elizabeth L Scholtz
Nitric oxide (NO) may have a role in persistent breeding-induced endometritis in mares through an inhibitory effect on uterine contractility. The objectives of this study were to test the effect of NO on spontaneous uterine contractility in-vitro and to evaluate whether this effect varied between the longitudinal and circular muscle layers of the uterus. Reproductive tracts were collected from eight euthanized non-pregnant mares (age 4-19 years; body weight 405-530 kg). Transrectal examination of the reproductive tract was performed before euthanasia to evaluate stage of the estrous cycle and presence of any apparent abnormality...
March 1, 2017: Theriogenology
https://www.readbyqxmd.com/read/28160161/feed-supplementation-improves-estrus-response-and-increases-fertility-of-sheep-induced-to-breed-out-of-season
#11
Z Ben Khlil, S Khnissi, M Rekik, N Lassoued
To test the efficacy on reproductive performance of nutritional supplementation in an out-of-season mating system, 66 adult prolific Barbarine ewes were selected and induced to breed using "ram effect". The ewes were allocated to two homogeneous groups; each ewe received on a daily basis 700 g of hay and 500 g of barley grains starting 3 weeks before or 1 week after rams' introduction in group 1 and group 2, respectively. Supplementation ended 1 month after rams' introduction and mating lasted 60 days...
March 2017: Tropical Animal Health and Production
https://www.readbyqxmd.com/read/28145727/estrogen-dependent-effects-of-5-hydroxytryptophan-on-cortical-spreading-depression-in-rat-modelling-the-serotonin-ovarian-hormone-interaction-in-migraine-aura
#12
Virginie Chauvel, Sylvie Multon, Jean Schoenen
Background Cortical spreading depression (CSD) is the likely culprit of the migraine aura. Migraine is sexually dimorphic and thought to be a "low 5-HT" condition. We sought to decipher the interrelation between serotonin, ovarian hormones and cortical excitability in a model of migraine aura. Methods Occipital KCl-induced CSDs were recorded for one hour at parieto-occipital and frontal levels in adult male (n = 16) and female rats (n = 64) one hour after intraperitoneal (i.p.) injection of 5-hydroxytryptophan (5-HTP) or NaCl...
January 1, 2017: Cephalalgia: An International Journal of Headache
https://www.readbyqxmd.com/read/28109914/anti-inflammatory-and-toxicological-evaluation-of-essential-oil-from-piper-glabratum-leaves
#13
Lidiane Schultz Branquinho, Joyce Alencar Santos, Claudia Andrea Lima Cardoso, Jonas da Silva Mota, Ubirajara Lanza Junior, Cândida Aparecida Leite Kassuya, Arielle Cristina Arena
ETHNOPHARMACOLOGICAL RELEVANCE: Although some of the species of the genus Piper exhibit interesting biological properties, studies on Piper glabratum Kunth are very limited. AIM OF THE STUDY: This study investigated the anti-inflammatory activity and the toxicological profile of the essential oil from P. glabratum leaves (OEPG) in mice. MATERIALS AND METHODS: The acute toxicity of OEPG was evaluated by oral administration to female mice as single doses of 500, 1000, 2000 or 5000mg/kg/body weight...
January 18, 2017: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/28056994/hexokinase-2-drives-glycogen-accumulation-in-equine-endometrium-at-day-12-of-diestrus-and-pregnancy
#14
Sarah A Bramer, Alysson Macedo, Claudia Klein
BACKGROUND: Secretion of histotroph during the prolonged pre-implantation phase in mares is crucial to pregnancy maintenance, manifested as increased embryonic loss in mares with age-related endometrial degeneration. Glycogen content of uterine histotroph is higher during the progesterone-dominated phase of the estrous cycle in mares, but regulatory mechanisms are not well understood. METHODS: mRNA expression of glycogen-metabolizing enzymes (HK1, HK2, GSK3B, GYS1, PEPCK, PKM, PYGM) in endometrial samples were compared among mares in anestrus, estrus, and at Day 12 of diestrus and pregnancy...
January 5, 2017: Reproductive Biology and Endocrinology: RB&E
https://www.readbyqxmd.com/read/28046180/effect-of-timing-of-relocation-of-replacement-gilts-from-group-pens-to-individual-stalls-before-breeding-on-fertility-and-well-being
#15
R V Knox, J Shen, L L Greiner, J F Connor
Variation in gilt fertility is associated with increased replacement and reduced longevity. Stress before breeding is hypothesized to be involved in reduced fertility. This study tested the timing of gilt relocation from pens to individual stalls before breeding on fertility and well-being. The experiment was performed in replicates on a commercial research farm. After detection of first estrus, gilts ( = 563) were assigned to treatment for relocation into stalls 3 wk (REL3wk), 2 wk (REL2wk), or 1 wk (REL1wk) before breeding at second estrus...
December 2016: Journal of Animal Science
https://www.readbyqxmd.com/read/28043377/short-term-supplementation-with-maize-increases-ovulation-rate-in-goats-when-dietary-metabolizable-energy-provides-requirements-for-both-maintenance-and-1-5-times-maintenance
#16
Daniel M Nogueira, Ahmad Eshtaeba, John Cavalieri, Lee A Fitzpatrick, Bruce Gummow, Dominique Blache, Anthony J Parker
This study aimed to evaluate ovarian follicular dynamics in goats submitted to synchronization of estrus and supplemented with diets that differed in the metabolizable energy source and amount of energy. The experiment was carried out using 42 does allocated into three treatments, fed for 9 days with a ration providing 1.0 times maintenance containing maize (1 MM, n = 14) or without maize (1 M, n = 14) or a ration providing 1.5 times maintenance containing maize (1.5 MM, n = 14). Estrus was synchronized with two injections of cloprostenol given 7 days apart...
February 2017: Theriogenology
https://www.readbyqxmd.com/read/28043372/relationships-among-stallion-fertility-and-semen-traits-using-estimated-breeding-values-of-german-warmblood-stallions
#17
Maren Gottschalk, Harald Sieme, Gunilla Martinsson, Ottmar Distl
A high quality of stallion semen is of particular importance for maximum reproductive efficiency. In the present study, we estimated the relationships among estimated breeding values (EBVs) of semen traits and EBVs for the paternal component of the pregnancy rate per estrus cycle (EBV-PAT) for 100 German Warmblood stallions using correlation and general linear model analyses. The most highly correlated sperm quality trait was total number of progressively motile sperm (r = 0.36). EBV-PAT was considered in three classes with stallions 1 SD below (<80), around (80-120), and above (>120) the population mean of 100...
February 2017: Theriogenology
https://www.readbyqxmd.com/read/28011259/exploration-of-luteinizing-hormone-in-murrah-buffalo-bubalus-bubalis-urine-extended-surge-window-opens-door-for-estrus-prediction
#18
Ramu Muthu Selvam, Suneel Kumar Onteru, Varij Nayan, Muthusamy Sivakumar, Dheer Singh, Govindaraju Archunan
Estrus detection in buffaloes has been a major concern for decades, and lack of reliable methods affects their effective reproductive management. Luteinizing hormone (LH) detection in urine is in practice for several mammals for timed insemination, whereas very few reports are available on buffalo urinary LH. The focus of this study is to detect the presence of LH in buffalo urine, quantitate variation in urinary LH during different estrous cycle phases and examine the duration of mid-cycle LH window. Nearly hundred buffaloes were examined, longitudinal urine samples (n=42) were collected from seventeen animals and classified into respective phases based on several estrus detection parameters...
December 21, 2016: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/27997360/salvia-miltiorrhiza-bunge-increases-estrogen-level-without-side-effects-on-reproductive-tissues-in-immature-ovariectomized-mice
#19
Ying Xu, Ting Chen, Xin Li, Ya-Kun Qu, Jin-Na An, Hong-Xia Zheng, Zi-Jia Zhang, Na Lin
Salvia miltiorrhiza bunge(SM) is a popular herb for alleviating menopausal symptoms, although the scientific evidence of applying SM to estrogen replacement therapy is limited. In this study, we characterized the estrogenic activity of SM using in vivo models of immature and ovariectomized (OVX) mice and performed in vitro studies focusing on the estrogen receptor (ER) pathway for further molecular characterizations. SM treatments demonstrated significant estrogenic activity by promoting the development of uterus and vagina in immature mice, restoring the estrus cycle and reversing the atrophy of reproductive tissues in OVX mice, as well as increasing the expressions of ERα and ERβ at protein and mRNA level in the reproductive tissues...
December 20, 2016: Aging
https://www.readbyqxmd.com/read/27988272/the-impact-of-postnatal-leuprolide-acetate-treatment-on-reproductive-characteristics-in-a-rodent-model-of-polycystic-ovary-syndrome
#20
Lady Katerine Serrano Mujica, Kalyne Bertolin, Alessandra Bridi, Werner Giehl Glanzner, Vitor Braga Rissi, Flávia de Los Santos de Camargo, Renato Zanella, Osmar Damian Prestes, Rafael Noal Moresco, Alfredo Quites Antoniazzi, Paulo Bayard Dias Gonçalves, Melissa Orlandin Premaor, Fabio Vasconcellos Comim
In this study, a GnRH agonist, leuprolide acetate (LA), was given as a single depot injection before 48 h of life to Wistar female rats allotted to prenatal (E16-18) and postnatal androgenization (day 5 of life) by the use of testosterone propionate, looking for reproductive endpoints. Remarkably, a single injection of LA increased the estrus cycles in the postnatal group (PostN) from 0% to 25% of the estrus cycles in the postnatal LA treated group (PostN L). LA also reduced the serum testosterone levels and cysts and atretic follicles in PostN L in contrast with rats (>100 days) from the PostN group (p = 0...
February 15, 2017: Molecular and Cellular Endocrinology
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