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Estrus cycle

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https://www.readbyqxmd.com/read/28818583/timing-of-fertile-period-for-successful-pregnancy-in-american-bully-dogs
#1
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
#2
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
#3
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
#4
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...
July 26, 2017: Theriogenology
https://www.readbyqxmd.com/read/28763724/ovarian-dynamics-and-estrous-cycle-length-in-the-donkey-equus-asinus
#5
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...
July 10, 2017: Theriogenology
https://www.readbyqxmd.com/read/28741626/dopamine-and-stress-system-modulation-of-sex-differences-in-decision-making
#6
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
#7
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
#8
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
https://www.readbyqxmd.com/read/28698542/genome-wide-differential-mrna-expression-profiles-in-follicles-of-two-breeds-and-at-two-stages-of-estrus-cycle-of-gilts
#9
Qingpo Chu, Bo Zhou, Feilong Xu, Ruonan Chen, Chunyan Shen, Tingting Liang, Yuan Li, Allan P Schinckel
Estrus expression by gilts and sows is hereditable and important for heat detection. To better understand the molecular biological mechanisms of estrus expression in gilts, the mRNA expression profiles of follicular tissue from Large White gilts in diestrus (LD, n = 3) and estrus (LE, n = 3), and Chinese indigenous Mi gilts in diestrus (MD, n = 2) and estrus (ME, n = 3) were investigated using RNA sequencing. We detected 122,804-335,295 SNPs, 6,140-14,947 InDel and 12 types of AS events (39...
July 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28687593/effect-of-controlled-ovarian-hyperstimulation-on-puberty-and-estrus-in-mice-offspring
#10
Jiahui Ding, Xiujuan Tan, Kunkun Song, Wenwen Ma, Jing Xiao, Mingmin Zhang
Controlled ovarian hyperstimulation (COH) is widely used for the treatment of infertility, while the long-term effects of COH on the reproductive function in female offspring are currently unknown. Based on the fact that COH could cause high E2 levels in women throughout pregnancy, and excess estrogenic exposure during fetal development is harmful to subsequent adult ovarian function. We assumed the hypothesis that COH disrupts reproductive function in female offspring. To test this hypothesis, COH was induced in mice to obtain female offspring by PMSG and HCG, then we evaluated pubertal transition, serum levels of E2, AMH, FSH and LH, mRNA expressions of Esr1, Amhr2, Fshr and Lhcgr in ovaries, number of follicles and ovarian histology, and we also investigated apoptosis of follicles by TUNEL, the mRNA expressions of Fas, FasL, Bax, Bcl2, Caspase3, 8 and 9 by Quantitative Real-Time PCR, as well as the protein expressions of CLEAVED-CASPASE3, 8 and 9 by Western blot...
July 7, 2017: Reproduction: the Official Journal of the Society for the Study of Fertility
https://www.readbyqxmd.com/read/28668525/dynamics-of-putative-sex-pheromone-components-during-heat-periods-in-estrus-induced-cows
#11
R Mozūraitis, J Kutra, A-K Borg-Karlson, V Būda
Determination of the optimal insemination time in dairy cows is vital for fertilization success and is a challenging task due to silent or weak signs of estrus shown by some cows. This can be overcome by combining several estrus detection methods, leading to higher detection rates. However, an efficient, noninvasive method for detecting estrus in cows is still needed. Chemical cues released by the cow during estrus have been proposed to have pheromonal properties and signal readiness to mate to the bull. Such cues could be used in an industrial setting to detect cows in estrus...
September 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28664146/oviductal-transcriptional-profiling-of-a-bovine-fertility-model-by-next-generation-sequencing
#12
Angela Maria Gonella-Diaza, Sónia Cristina da Silva Andrade, Mariana Sponchiado, Guilherme Pugliesi, Fernando Silveira Mesquita, Veerle Van Hoeck, Ricardo de Francisco Strefezzi, Gustavo R Gasparin, Luiz L Coutinho, Mario Binelli
In cattle, the oviduct plays a fundamental role in the reproductive process. Oviductal functions are controlled by the ovarian sex steroids: estradiol and progesterone. Here, we tested the hypothesis that the exposure to contrasting sex steroid milieus differentially impacts the oviductal transcriptional profile. We manipulated growth of the pre-ovulatory follicle to obtain cows that ovulated a larger (LF group) or a smaller (SF group) follicle. The LF group presented greater proestrus/estrus concentrations of estradiol and metaestrus concentrations of progesterone (Gonella-Diaza et al...
September 2017: Genomics Data
https://www.readbyqxmd.com/read/28660294/influence-of-estrous-cycle-hormonal-fluctuations-and-gonadal-hormones-on-the-ventilatory-response-to-hypoxia-in-female-rats
#13
Danuzia A Marques, Débora de Carvalho, Glauber S F da Silva, Raphael E Szawka, Janete A Anselmo-Franci, Kênia C Bícego, Luciane H Gargaglioni
Sex hormones may influence many physiological processes. Recently, we demonstrated that hormonal fluctuations of cycling female rats do not affect respiratory parameters during hypercapnia. However, it is still unclear whether sex hormones and hormonal fluctuations that occur during the estrous cycle can affect breathing during a hypoxic challenge. Our study aimed to evaluate respiratory, metabolic, and thermal responses to hypoxia in female rats on different days of the estrous cycle (proestrus, estrus, metestrus, and diestrus) and in ovariectomized rats that received replacement with oil (OVX), estradiol (OVX + E2), or a combination of estradiol and progesterone (OVX + E2P)...
June 28, 2017: Pflügers Archiv: European Journal of Physiology
https://www.readbyqxmd.com/read/28628266/embryo-maternal-dialogue-during-pregnancy-establishment-and-implantation-in-the-pig
#14
REVIEW
Agnieszka Waclawik, Monika M Kaczmarek, Agnieszka Blitek, Piotr Kaczynski, Adam J Ziecik
Porcine conceptuses secrete pregnancy-recognition signals (estrogens, including estradiol-17β) that inhibit luteolysis, thereby prolonging progesterone production by corpora lutea. The supportive mechanism by which the conceptus also inhibits luteolysis is by shifting endometrial prostaglandin (PG) synthesis to luteoprotective PGE2. Progesterone stimulates endometrial production of factors that are essential for conceptus development. Priming the uterus by progesterone and loss of progesterone receptors from the uterine epithelium by D1ay 10-12 after estrus are key for achieving endometrial receptivity for implantation...
June 19, 2017: Molecular Reproduction and Development
https://www.readbyqxmd.com/read/28624479/food-restriction-induced-changes-in-motivation-differ-with-stages-of-the-estrous-cycle-and-are-closely-linked-to-rfamide-related-peptide-3-but-not-kisspeptin-in-syrian-hamsters
#15
REVIEW
Noah A Benton, Kim A Russo, Jeremy M Brozek, Ryan J Andrews, Veronica J Kim, Lance J Kriegsfeld, Jill E Schneider
We tested the hypothesis that the effects of food restriction on behavioral motivation are mediated by one or both of the RFamide peptides, RFamide-related peptide-3 (RFRP-3) and kisspeptin (Kp) in female Syrian hamsters (Mesocricetus auratus). Female hamsters fed ad libitum and given a choice between food and adult male hamsters are highly motivated to visit males instead of food on all four days of the estrous cycle, but after 8days of mild food restriction (75% of ad libitum intake) they shift their preference toward food every day of the estrous cycle until the day of estrus, when they shift their preference back toward the males...
June 15, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/28606740/chronic-treatment-with-estradiol-restores-depressive-like-behaviors-in-female-wistar-rats-treated-neonatally-with-clomipramine
#16
Tania Molina-Jímenez, Liliana Landa-Cadena, Herlinda Bonilla-Jaime
Neonatal administration of clomipramine (CMI) induces diverse behavioral and neurochemical alterations in adult male rats that resemble major depression disorder. However, the possible behavioral alterations in adult female rats subjected to neonatal treatment with clomipramine are unknown. Therefore, the aim of this study was to explore the effect of neonatal treatment with CMI on adult female rats in relation to locomotion and behavioral despair during the estrus cycle. Also evaluated was the effect of chronic treatment with E2 on these female CMI rats...
June 29, 2017: Hormones and Behavior
https://www.readbyqxmd.com/read/28592693/nongenomic-actions-of-17-%C3%AE-estradiol-restore-respiratory-neuroplasticity-in-young-ovariectomized-female-rats
#17
Brendan J Dougherty, Elizabeth S Kopp, Jyoti J Watters
Gonadal steroids modulate CNS plasticity, including phrenic long-term facilitation (pLTF), a form of spinal respiratory neuroplasticity resulting in increased phrenic nerve motor output following exposure to acute intermittent hypoxia (aIH; three 5 min episodes, 10.5% O2). Despite the importance of respiratory system neuroplasticity, and its dependence on estrogen in males, little is known about pLTF expression or mechanisms of estrogen signaling in females. Here, we tested the hypotheses that (1) pLTF expression in young, gonadally intact female rats would be expressed during estrous cycle stages in which 17β-estradiol (E2) is naturally high (e...
July 12, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28542730/estrogen-receptor-%C3%AE-regulates-the-tumoral-suppressor-pten-to-modulate-pituitary-cell-growth
#18
Pablo A Perez, Juan P Petiti, Florencia Picech, Carolina B Guido, Liliana dV Sosa, Ezequiel Grondona, Jorge H Mukdsi, Ana L De Paul, Alicia I Torres, Silvina Gutierrez
In this study, we focused on ERβ regulation in the adenohypophysis under different estrogenic milieu, by analyzing whether ER modulates the phosphatase and tensin homolog deleted on chromosome 10 (PTEN) expression and its subcellular localization on anterior pituitary glands from Wistar rats and GH3 lactosomatotroph cells that over-expressed ERβ. ERβ was regulated in a cyclic manner, and underwent dynamic changes throughout the estrous cycle, with decreased ERβ+ cells in estrus and under E2 treatment, but increased in ovariectomized rats...
May 20, 2017: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/28532842/effects-of-diet-and-arginine-treatment-during-the-luteal-phase-on-ovarian-no-pgc-1%C3%AE-signaling-in-ewes
#19
Yi-Xuan Guo, Hai-Tao Nie, Ling-Wei Sun, Guo-Min Zhang, Kai-Ping Deng, Yi-Xuan Fan, Feng Wang
The aim of this study was to determine whether arginine (Arg) supplementation of malnourished ewes affects the expression of key NO/PGC-1α signaling pathway genes in the ovary. On Day 6-15 of the estrous cycle, 24 multiparous Hu sheep (BW = 43.56 ± 1.53 kg) were randomly assigned to three groups: control group (CG; n = 6), restriction group (RG; n = 9) and l-arginine group (AG; n = 9), and administered Arg treatment (or vehicle) three times per day. The ewes were slaughtered at the end of treatment, and blood samples and ovaries were collected for analysis...
July 1, 2017: Theriogenology
https://www.readbyqxmd.com/read/28532834/effects-of-feeding-green-microalgae-on-ovarian-activity-reproductive-hormones-and-metabolic-parameters-of-boer-goats-in-arid-subtropics
#20
W Senosy, A Y Kassab, A A Mohammed
The present study aimed to improve ovarian follicle development and plasma metabolites and hormone concentrations upon supplementation of Boer goats with green microalga (Dunaliella salina; 10 g/head/day) (N = 20; MAT group) compared to control (N = 10; not receive microalgae) in subtropics. Estrus was synchronized in all animals by two intramuscular administration of 12.5 mg dinoprost 11 days a part. MAT group was supplemented with Dunaliella salina for 11 days (from the day of first injection of dinoprost till the second injection)...
July 1, 2017: Theriogenology
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