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Estrus cycle

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https://www.readbyqxmd.com/read/29043090/the-use-of-infrared-thermography-to-detect-the-stages-of-estrus-cycle-and-ovulation-time-in-anatolian-shepherd-dogs
#1
Kemal Tuna Olğaç, Ergun Akçay, Beste Çil, Burak Mehmet Uçar, Ali Daşkın
BACKGROUND: The aim of the study is to evaluate the effectiveness of thermographic monitoring, using the temperature changes of perianal and perivulvar areas for the determination of estrus in Anatolian Shepherd bitches. Fifteen bitches were used in the study. Blood and vaginal smear samples were collected and thermographic monitoring of perianal and perivulvar areas were carried out starting from proestrus to early diestrus. Also, external signs of estrus were investigated. Smear samples were evaluated by light microscopy after Diff-Quik staining method and superficial and keratinized superficial cells were determined as percentage (S + KS%)...
2017: Journal of Animal Science and Technology
https://www.readbyqxmd.com/read/29033104/progesterone-releasing-devices-for-cattle-estrus-induction-and-synchronization-device-optimization-to-anticipate-shorter-treatment-durations-and-new-device-developments
#2
W de Graaff, B Grimard
Synchronization programs using progesterone-releasing intravaginal devices that allow for fixed time artificial insemination are still finding increasing application in bovine reproduction. This practice is useful for rationalizing livestock management because an increased number of cows can be inseminated in one session without the need for estrus detection. Although much of the innovation related to the design and development of intravaginal devices for use in cattle took place in the previous century, progress in understanding the physiology of the bovine estrous cycle resulted in shorter treatment durations, a trend which is still continuing...
September 27, 2017: Theriogenology
https://www.readbyqxmd.com/read/28987795/morphological-evaluation-of-day-8-embryos-developed-during-induced-aluteal-cycles-in-the-mare
#3
C A Leisinger, V Medina, M L Markle, D L Paccamonti, C R F Pinto
A novel in vivo model utilizing serial administrations of PGF2α to induce aluteal cycles in the mare was used to evaluate the effects of progesterone-deprivation on the morphology of in vivo preimplantation embryos. We hypothesized that equine embryos produced during induced aluteal cycles (AL) would be developmentally affected, characterized by earlier embryo stage at collection, smaller embryo diameter, and lower quality grade, compared with those collected on the same day post-ovulation from control cycles during diestrus (high progesterone; > 4 ng/mL)...
September 25, 2017: Theriogenology
https://www.readbyqxmd.com/read/28954870/sex-and-estrus-dependent-differences-in-rat-basolateral-amygdala
#4
Shannon R Blume, Mari Freedberg, Jaime E Vantrease, Ronny Chan, Mallika Padival, Matthew J Record, M Regina DeJoseph, Janice H Urban, J Amiel Rosenkranz
Depression and anxiety are diagnosed almost twice as often in women, the symptomology differs in men and women and is sensitive to sex hormones. The basolateral amygdala (BLA) contributes to emotion-related behaviors that differ between males and females and across the reproductive cycle. This hints to sex- or estrus-dependent features of BLA function, about which very little is known. The purpose of this study was to test whether there are sex differences or estrous cyclicity in rat BLA physiology and to determine their mechanistic correlates...
September 27, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28940594/characteristics-of-bioelectrical-activity-of-oviducts-and-uterus-during-early-pregnancy-in-sows-recorded-by-telemetry-method
#5
Bartosz Pawlinski, Malgorzata Domino, Romuald Zabielski, Katarzyna Siewruk, Malgorzata Polanska-Plachta, Zdzislaw Gajewski
The aim of the present study was to record the myoelectric activity of the reproduction tract in sows during the estrous phase and the early pregnancy period via telemetry recording system. In a total of eight non-pregnant pigs, the bioelectrical activity was recorded through three silicone electrodes sutured on the oviduct (isthmus and ampulla) and the uterine horn. Blood samples were collected to monitor the levels of progesterone (P4) and luteinizing hormone (LH). The estrous cycle was synchronized with eCG and hCG and the animals were subjected to artificial insemination (AI)...
September 21, 2017: Experimental Physiology
https://www.readbyqxmd.com/read/28916783/differential-regulation-of-vaginal-lipocalins-obp-mup-during-the-estrous-cycle-of-the-house-mouse
#6
Martina Černá, Barbora Kuntová, Pavel Talacko, Romana Stopková, Pavel Stopka
Female house mice produce pheromone-carrying major urinary proteins (MUPs) in a cycling manner, thus reaching the maximum urinary production just before ovulation. This is thought to occur to advertise the time of ovulation via deposited urine marks. This study aimed to characterize the protein content from the house mouse vaginal flushes to detect putative vaginal-advertising molecules for a direct identification of reproductive states. Here we show that the mouse vaginal discharge contains lipocalins including those from the odorant binding (OBP) and major urinary (MUP) protein families...
September 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28901587/serum-estradiol-and-progesterone-profiles-during-estrus-pseudopregnancy-and-active-gestation-in-steller-sea-lions
#7
Renae Sattler, Lori Polasek
While the proximate driver behind the decline of the Western stock of Steller sea lions (Eumetopias jubatus, >80% since 1970s) is likely multifactorial, the population reduction may have been powered by a decrease in fecundity. A harvest of Steller sea lions in the 1970s and 80s revealed a 30% reduction in the proportion of pregnant females from early (October-November) to late gestation (April-May). Identification and quantification of these reproductive failures are difficult when we lack species-specific data on endocrinology associated with discrete stages of the reproductive cycle (i...
September 13, 2017: Zoo Biology
https://www.readbyqxmd.com/read/28888606/preovulatory-follicle-characteristics-and-oocyte-competence-in-repeat-breeder-dairy-cows
#8
P Sood, M Zachut, I Dekel, H Dube, S Jacoby, U Moallem
The varied and elusive etiology of repeat breeding (RB) in dairy cows necessitates evaluation of oocytes and follicles, which have not previously been assessed together. Accordingly, we evaluated characteristics of preovulatory follicles and the competence of oocytes in control (CTL) and RB cows. The estrous cycles of 35 cows (18 CTL and 17 RB) were synchronized using PGF2α and estrus detection. Cows with a corpus luteum were treated with PGF2α and, 14 to 15 d after a visible behavioral estrus, they were administered a second PGF2α, followed 48 h later by follicular fluid (FF) aspiration of the preovulatory follicles...
November 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28887616/amitriptyline-plays-important-roles-in-modifying-the-ovarian-morphology-and-improving-its-functions-in-rats-with-estradiol-valerate-induced-polycystic-ovary
#9
Xinqiang Li, Shufen Wang, Li Zhang, Lei Zhang, Jiali Liu, Haoshu Luo, Kemian Gou, Sheng Cui
Previous studies demonstrated that depression is more prevalent in women with polycystic ovary syndrome (PCOS). In this study, we aimed to determine whether amitriptyline (AMT), an antidepressant drug, plays a role in preventing PCOS. The results showed that AMT modified ovarian morphology improved the ovarian functions and estrus cycle in estradiol valerate (EV)-induced polycystic ovary (PCO). AMT restored the levels of estradiol (E2), testosterone (T) and progesterone (P4) to normal, and elevated the level of luteinizing hormone (LH) in EV-induced PCO...
September 8, 2017: Archives of Pharmacal Research
https://www.readbyqxmd.com/read/28877731/hypoluteoidism-in-a-dog-associated-with-recurrent-mammary-fibroadenoma-stimulated-by-progestin-therapy
#10
Maria Teresa Zedda, Luisa Bogliolo, Elisabetta Antuofermo, Laura Falchi, Federica Ariu, Giovanni Pietro Burrai, Salvatore Pau
BACKGROUND: Hypoluteoidism in the bitch is characterized by insufficient production and secretion of progesterone by the corpora lutea. It is a rare pathologic condition and during pregnancy, it leads to embryonic resorption or fetal abortion. Supplementary therapy with progestins is indicated during pregnancy to obtain delivery of vital puppies but unwarranted side effects of such treatment are poorly documented. CASE PRESENTATION: A 4-year-old, nulliparous, female Istrian Shorthaired Hound dog had been mated repeatedly in six heats with different dogs of proven fertility but signs of pregnancy did not develop...
September 6, 2017: Acta Veterinaria Scandinavica
https://www.readbyqxmd.com/read/28867895/estrous-cycle-phase-dependent-changes-in-anxiety-and-depression-like-profiles-in-the-late-adolescent-wistar-kyoto-rat
#11
Deepthi D'Souza, Monika Sadananda
BACKGROUND: Depression often manifests during adolescence when the development and networking of social and emotional brain areas is being influenced by hormones. The Wistar Kyoto (WKY) rat has been proposed as an animal model of adolescent depression with various face, construct, and predictive validities for clinical depression having been established. PURPOSE: The influence of the estrous cycle on anxiety- and depression-like behaviors in female adolescents may be tested out further using this model...
July 2017: Annals of Neurosciences
https://www.readbyqxmd.com/read/28842205/effects-of-chronic-exposure-to-octamethylcyclotetrasiloxane-and-decamethylcyclopentasiloxane-in-the-aging-female-fischer-344-rat
#12
Paul A Jean, Eddie D Sloter, Kathleen P Plotzke
Octamethylcyclotetrasiloxane (D4) and decamethylcyclopentasiloxane (D5) are used as intermediates or monomers in the synthesis of silicon-based polymers for industrial or consumer applications. D4 and D5 may remain as residual monomer in these polymers at less than 1000ppm and may therefore be present as a minor impurity in consumer products. For D5, in addition to the manufacture of polymers, its uses include intentional addition to consumer products, personal care products and some dry- cleaning solvents...
October 20, 2017: Toxicology Letters
https://www.readbyqxmd.com/read/28818583/timing-of-fertile-period-for-successful-pregnancy-in-american-bully-dogs
#13
Sang-Eun Hahn, Young-Kwang Jo, Yun-Kyong Jin, Goo Jang
Determination of the timing of the estrus cycle is essential for fertile mating. There are physiological variations among breeds, between bitches, and between cycles of the same bitch. If serial monitoring and many tools are applied, the exact moment of ovulation could be pin-pointed. However, it leads to time and costly difficulties. Progesterone concentrations during estrus cycles follow a specific pattern, and it is largely used in timing of fertile period. Although it has similar pattern in general, it is likely that breed-specific differences exist...
July 26, 2017: Theriogenology
https://www.readbyqxmd.com/read/28814191/maternal-overweight-disrupts-the-sexual-maturation-of-the-offspring
#14
Rocío A Galarza, Eric A Rhon Calderón, Analía E Cortez, Alicia G Faletti
The aims of the present work were to study the effect of maternal overweight and obesity on the ovarian reserve, follicular development, and ovulation of the offspring and to assess whether this maternal condition alters oocyte integrity. To this end, female offspring from rats fed standard (OSD) or cafeteria (OCD) diet were used. Body weight, vaginal opening, and estrous cycle were recorded and ovaries were obtained on the day of the second estrus. In addition, ovarian weight, ovulation rate (measured by the number of oocytes within oviducts), follicular development (determined by histology), and oocyte integrity were examined...
September 2017: Reproductive Sciences
https://www.readbyqxmd.com/read/28814190/effects-of-neonatal-exposure-to-zearalenone-on-puberty-timing-hypothalamic-nuclei-of-avpv-and-arc-and-reproductive-functions-in-female-mice
#15
Rahmatollah Parandin, Morteza Behnam-Rassouli, Nasser Mahdavi-Shahri
It is now established that mycoestrogen zearalenone (ZEN) disrupts reproductive physiology, but the specific mechanisms by which this occurs remain unknown, especially in brain. Growing evidence suggests that populations of estradiol (E2)-sensitive neurons in anteroventral periventricular (AVPV) and arcuate (ARC) nuclei, especially kisspeptin neurons, play a pivotal role in the timing of puberty onset, ovulation, and normal reproduction. The present study was conducted to find whether the ZEN can cause estrogen-like actions during the critical period of neonatal differentiation...
September 2017: Reproductive Sciences
https://www.readbyqxmd.com/read/28780483/alteration-of-the-pi3k-akt-signaling-pathway-by-swainsonine-affects-17%C3%AE-estradiol-secretion-in-ovary-cells
#16
Chenchen Wu, Dujian Yan, Dezhang Lu, Tiesuo Han, Baoyu Zhao
BACKGROUND: The ingestion of locoweed that contains the toxic indolizidine alkaloid swainsonine (SW) disrupts ovarian function, accompanied by delayed estrus, increased estrous cycle length, delayed conception, and abortion. GOALS: The direct effects of SW on ovary cell steroidogenesis remain unclear. MATERIALS AND METHODS: In this study, Chinese hamster ovary (CHO) cells were used to investigate the effects of SW on estradiol (E2) secretion and cell viability and the mechanisms involved in these processes...
November 2017: Theriogenology
https://www.readbyqxmd.com/read/28763724/ovarian-dynamics-and-estrous-cycle-length-in-the-donkey-equus-asinus
#17
Maricruz Díaz-Duran, Luis Zarco, Ana Myriam Boeta
Nine jennies were monitored daily by ultrasonography during three complete ovarian cycles in order to evaluate if the timing of luteolysis and the growth pattern of the ovulatory follicle (OVF) before, during and after luteolysis are related to the length of the interovulatory interval (IOI). Blood samples for progesterone determination were obtained daily during one of the cycles of each jenny. The cycles were classified according to the length of the IOI into three groups: Short IOI (21.2 ± 0.3 d, n = 10), medium IOI (23...
November 2017: Theriogenology
https://www.readbyqxmd.com/read/28741626/dopamine-and-stress-system-modulation-of-sex-differences-in-decision-making
#18
Polymnia Georgiou, Panos Zanos, Shambhu Bhat, J Kathleen Tracy, Istvan J Merchenthaler, Margaret M McCarthy, Todd D Gould
Maladaptive decision making is associated with several neuropsychiatric disorders, including problem gambling and suicidal behavior. The prevalence of these disorders is higher in men versus women, suggesting gender-dependent regulation of their pathophysiology underpinnings. We assessed sex differences in decision making using the rat version of the Iowa gambling task. Female rats identified the most optimal choice from session 1, while male rats from session 5. Male, but not female rats, progressively improved their advantageous option responding and surpassed females...
July 25, 2017: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28720311/evaluation-of-changes-in-blood-flow-of-the-uterine-artery-by-doppler-ultrasonography-during-the-estrous-cycle-in-lactating-bos-indicus-cows
#19
Mubbashar Hassan, Abdul Sattar, Muhammad Bilal, Muhammad Avais, Nasim Ahmad
The objective of this study was to evaluate the changes in uterine blood flow (UBF) based on the resistance index (RI) and the pulsatility index (PI) by Doppler ultrasonography throughout the estrous cycle in lactating Sahiwal cows (n=9). Cows were randomly selected during their spontaneous estrus. UBF was examined on alternate days in all cows during the estrous cycle. The results revealed that the mean RI values were higher (P<0.05) on day -1 (estrus) than on day 0 (ovulation). The mean RI values followed a consistent pattern on days 2, 4, 6, and 8 (metestrus to early diestrus) and were lower (P<0...
July 9, 2017: Animal Reproduction Science
https://www.readbyqxmd.com/read/28708503/effect-of-dietary-supplementation-of-omega-3-polyunsaturated-fatty-acid-pufa-rich-fish-oil-on-reproductive-performance-of-the-goat-capra-hircus
#20
Ajit Singh Mahla, Ravjibhai K Chaudhari, Atul Kumar Verma, Amit Kumar Singh, Sanjay Kumar Singh, Gyanendra Singh, Mihir Sarkar, Narayan Dutta, Harendra Kumar, Narayanan Krishnaswamy
Dietary supplementation of n-3 PUFA decreases the luteolytic PGF2α and improves the pregnancy rate in the dairy cow. However, its effect in the goat is not known. Accordingly, we studied the effect of supplementation of n-3 PUFA rich Fish oil (FO) on different reproductive events in the goat. Cycling goats (n = 30) were divided into two equal groups and fed an isocaloric and isonitrogenous diet supplemented with either FO (TRT; n = 15) or palm oil (PO) (CON; n = 15) @ 0.6 mL/kg body weight for 72 days during the breeding season...
May 26, 2017: Theriogenology
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