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Estrus cycle

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https://www.readbyqxmd.com/read/29664122/effects-of-changes-in-photoperiod-and-temperature-on-the-estrous-cycle-of-a-captive-female-giant-panda-ailuropoda-melanoleuca
#1
Trisha T N Tay, Desheng Li, Yan Huang, Pengyan Wang, Tasha Tahar, Josephine Kawi
The female giant panda's estrus is known to be photoperiod sensitive, triggered by increasing day length. A pair of giant pandas was brought to Singapore in September 2012 and exposed to a constant temperature and photoperiod during the first 2 years. The female did not show any signs of estrus during that period. In November 2014, photoperiod and temperature were manipulated to simulate seasonal changes, to investigate the effects of environmental factors on the sexual behavior of the giant pandas. This paper documents the changes and observations carried out from 2012 to 2016, in the attempt to breed this vulnerable species...
March 2018: Zoo Biology
https://www.readbyqxmd.com/read/29662904/identification-of-differentially-expressed-genes-in-porcine-ovaries-at-proestrus-and-estrus-stages-using-rna-seq-technique
#2
Songbai Yang, Xiaolong Zhou, Yue Pei, Han Wang, Ke He, Ayong Zhao
Estrus is an important factor for the fecundity of sows, and it is involved in ovulation and hormone secretion in ovaries. To better understand the molecular mechanisms of porcine estrus, the expression patterns of ovarian mRNA at proestrus and estrus stages were analyzed using RNA sequencing technology. A total of 2,167 differentially expressed genes (DEGs) were identified ( P ≤ 0.05, |log2   Ratio| ≥ 1), of which 784 were upregulated and 1,383 were downregulated in the estrus compared with the proestrus group...
2018: BioMed Research International
https://www.readbyqxmd.com/read/29659304/diet-induced-obesity-reduces-core-body-temperature-across-the-estrous-cycle-and-pregnancy-in-the-rat
#3
Rachael C Crew, Brendan J Waddell, Shane K Maloney, Peter J Mark
Obesity during pregnancy causes adverse maternal and fetal health outcomes and programs offspring for adult-onset diseases, including cardiovascular disease. Obesity also disrupts core body temperature (Tc ) regulation in nonpregnant rodents; however, it is unknown whether obesity alters normal maternal Tc adaptations to pregnancy. Since Tc is influenced by the circadian system, and both obesity and pregnancy alter circadian biology, it was hypothesized that obesity disrupts the normal rhythmic patterns of Tc before and during gestation...
April 16, 2018: Chronobiology International
https://www.readbyqxmd.com/read/29626739/hormonal-strategy-to-reduce-suckled-beef-cow-handling-for-timed-artificial-insemination-with-sex-sorted-semen
#4
M A V Silva, C S Santos, I G França, H G Pereira, M F Sá Filho, B G Freitas, B M Guerreiro, A Faquim, P S Baruselli, J R S Torres-Júnior
Two experiments were conducted to assess a hormonal strategy developed to reduce animal handling for timed artificial insemination (TAI) with sex-sorted semen. Four-hundred ninety-one (491) suckled beef cows received a progesterone (P4) intravaginal device and 2 mg intramuscular (im) injection of estradiol benzoate (EB) on a randomly chosen day of the estrus cycle (Day 0) in Experiment 1. Cows were treated with 500 μg of sodic cloprostenol (PGF2α) and with 300 IU of eCG at P4 device removal (Day 8); these cows were also randomly assigned to receive 1 mg of estradiol cypionate (EC) administered at P4 device removal (treatment EC-0h) or 1 mg of EB 24 h after P4 device removal (treatment EB-24h)...
March 21, 2018: Theriogenology
https://www.readbyqxmd.com/read/29615867/stable-density-and-dynamics-of-dendritic-spines-of-cortical-neurons-across-the-estrous-cycle-while-expressing-differential-levels-of-sensory-evoked-plasticity
#5
Bailin H Alexander, Heather M Barnes, Emma Trimmer, Andrew M Davidson, Benard O Ogola, Sarah H Lindsey, Ricardo Mostany
Periodic oscillations of gonadal hormone levels during the estrous cycle exert effects on the female brain, impacting cognition and behavior. While previous research suggests that changes in hormone levels across the cycle affect dendritic spine dynamics in the hippocampus, little is known about the effects on cortical dendritic spines and previous studies showed contradictory results. In this in vivo imaging study, we investigated the impact of the estrous cycle on the density and dynamics of dendritic spines of pyramidal neurons in the primary somatosensory cortex of mice...
2018: Frontiers in Molecular Neuroscience
https://www.readbyqxmd.com/read/29604381/sex-differences-and-estrous-cycle-changes-in-synaptic-plasticity-related-microrna-in-the-rat-medial-amygdala
#6
Mauro Mozael Hirsch, Janaína Brusco, Tamara Vaccaro, Rogerio Margis, Jorge E Moreira, Carmem Gottfried, Alberto A Rasia-Filho
The posterodorsal medial amygdala (MePD) is a sex steroid-sensitive and sexually dimorphic subcortical area that dynamically modulates social behaviors in rats. As different microRNA (miRNA) can act as post-transcriptional regulators of synaptic processing, we addressed changes that occur in miRNA expression in the MePD of males and females along the estrous cycle. The expression of miR25-3p, miR132-3p, miR138-5p, miR181a-5p, miR195-5p, and miR199a-5p, involved in neuronal cytoskeleton remodeling and synaptic plasticity, were evaluated by RT-qPCR...
March 28, 2018: Neuroscience
https://www.readbyqxmd.com/read/29597125/the-anti-inflammatory-effect-of-exogenous-lactoferrin-on-breeding-induced-endometritis-in-susceptible-mares-when-administered-post-breeding-in-susceptible-mares
#7
C E Fedorka, K E Scoggin, Y L Boakari, N E Hoppe, E L Squires, B A Ball, M H T Troedsson
The deposition of semen into the uterus of the horse induces a transient innate immune response that lasts 24-36 h in the normal mare. There exists a subset of mares that are unable to resolve this inflammation in a timely manner, and are classified as susceptible to the disease of persistent breeding-induced endometritis (PBIE). Lactoferrin is a protein of interest as a potential therapeutic for this persistent inflammation due to its anti-inflammatory and bactericidal properties. The addition of human recombinant lactoferrin (hrLF) to the insemination dose was previously shown to suppress mRNA expression of the pro-inflammatory cytokine tumor necrosis factor (TNF)-α at 6 h after insemination, but no studies have shown the effect of lactoferrin when infused post-breeding...
March 22, 2018: Theriogenology
https://www.readbyqxmd.com/read/29562483/effects-of-aging-and-gender-on-micro-rheology-of-blood-in-3-to-18-months-old-male-and-female-wistar-crl-wi-rats
#8
Viktoria Somogyi, Katalin Peto, Adam Deak, Bence Tanczos, Norbert Nemeth
BACKGROUND: Age- and gender-related alterations of hemorheological parameters have not been completely elucidated to date. Experiments on older animals may give valuable information on this issue. However, the majority of rheological studies have been performed in young rodents. OBJECTIVE: We aimed to investigate the influence of aging and gender on hemorheological parameters in rats. METHODS: Coeval male (n=10) and female (n=10) Wistar (Crl:WI) rats were followed-up over 15 months...
March 12, 2018: Biorheology
https://www.readbyqxmd.com/read/29558965/regulation-by-fsh-of-the-dynamic-expression-of-retinol-binding-protein-4-in-the-mouse-ovary
#9
Yanwen Jiang, Yun Zhao, Shuxiong Chen, Lu Chen, Chunjin Li, Xu Zhou
BACKGROUND: Ovarian retinoid homeostasis plays an important role in the physiological function of the ovary. Retinol-binding protein 4 (RBP4) acts as the mediator for the systemic and intercellular transport of retinol and is heavily involved in cellular retinol influx, efflux, and exchange. However, the expression patterns and regulatory mechanisms of Rbp4 in the ovary remain unclear. METHODS: The expression pattern of ovarian Rbp4 was examined in immature mice during different developmental stages and in adult mice during different stages of the estrous cycle...
March 20, 2018: Reproductive Biology and Endocrinology: RB&E
https://www.readbyqxmd.com/read/29555237/kisspeptin-system-in-ovariectomized-mice-estradiol-and-progesterone-regulation
#10
Marilena Marraudino, Mariangela Martini, Sara Trova, Alice Farinetti, Giovanna Ponti, Stefano Gotti, GianCarlo Panzica
The kisspeptin system is clustered in two main groups of cell bodies (the periventricular region, RP3V and the arcuate nucleus, ARC) that send fibers mainly to the GnRH neurons and in a few other locations, including the paraventricular nucleus, PVN. In physiological conditions, gonadal hormones modulate the kisspeptin system with expression changes according to different phases of the estrous cycle: the highest being in estrus phase in RP3V and PVN (positive feedback), and in ARC during the diestrus phase (negative feedback)...
March 16, 2018: Brain Research
https://www.readbyqxmd.com/read/29554986/review-using-artificial-insemination-v-natural-service-in-beef-herds
#11
P S Baruselli, R M Ferreira, M F Sá Filho, G A Bó
The aim of this review is to compare the performance of different reproductive programs using natural service, estrus synchronization treatment before natural service (timed natural breeding (TNB)), artificial insemination (AI) following estrus detection and timed artificial insemination (TAI) in beef herds. It is well known that after parturition the beef cow undergoes a period of anestrous, when they do not exhibit estrus, eliminating the opportunity to become pregnant in the early postpartum by natural mating or by AI after detection of estrus...
March 20, 2018: Animal: An International Journal of Animal Bioscience
https://www.readbyqxmd.com/read/29545171/estrous-cycle-dependent-modulation-of-in-vivo-microvascular-dysfunction-after-nanomaterial-inhalation
#12
P A Stapleton, C R McBride, J Yi, A B Abukabda, T R Nurkiewicz
Preconceptive health encompasses male and female reproductive capability. In females, this takes into account each of the stages of the estrous cycle. Microvascular reactivity varies throughout the estrous cycle in response to hormonal changes and in preparation for pregnancy. Microvascular alterations in response to engineered nanomaterial (ENM) exposure have been described within 24-hours of inhalation; however, the impact upon the uterine vasculature at differing estrous stages and at late-stage pregnancy is unclear...
March 12, 2018: Reproductive Toxicology
https://www.readbyqxmd.com/read/29530639/a-subchronic-feeding-safety-evaluation-of-transgenic-milk-containing-human-%C3%AE-defensin-3-on-reproductive-system-of-c57bl-6j-mouse
#13
Ming-Qing Gao, Ruiqi Zhang, Yange Yang, Yuru Luo, Ming Jiang, Yingli Zhang, Yong Zhang, Suzhu Qing
Bovine mastitis is an infectious disease of the mammary gland which has been generally treated by antibiotic delivery. While the increasing drug-resistant bacteria and the high consumption of the antibiotic had become a noticeable concern. In a previous study, a mammary special vector expressing human β-defensin 3 (hBD3) was transfected into bovine fetal fibroblasts to produce mastitis-resistant bovine. This investigation focused on potential unintended effects of transgenic milk containing hBD3 produced by these mastitis-resistant bovine on the reproductive system of C57BL/6J mice...
March 9, 2018: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/29526512/influence-of-estrous-cycle-and-gestation-on-cardiovascular-system-of-bitches
#14
Vivian T Almeida, Ricardo A R Uscategui, Antônio A Camacho, Marlos G Sousa, Victor J C Santos, Marjury C Maronezi, Wilter R R Vicente, Marcus A R Feliciano
The purpose of this study was to evaluate the consequences of the estrous cycle and gestation on the cardiovascular system of bitches evaluated through echocardiographic assessment. Fifteen healthy pregnant bitches aged 2 to 6 years and weighing 8.8 ± 2.5 kg were included in the study. Heart rate and blood pressure were clinically evaluated. M-mode, spectral, and tissue Doppler-echocardiography assessments were performed during the anestrous and estrous stages, every 15 days during pregnancy (15, 30, 45, and 60 days), and 45 days postpartum...
March 1, 2018: Animal Reproduction Science
https://www.readbyqxmd.com/read/29511641/the-consequence-of-nac-on-sodium-arsenite-induced-uterine-oxidative-stress
#15
Moumita Dash, Moulima Maity, Arindam Dey, Hasina Perveen, Shamima Khatun, Lipirani Jana, Sandip Chattopadhyay
Arsenic consumption through drinking water is a worldwide major health problem. Management of arsenic intoxication with invasive, painful therapy using metal chelators is usually used as a conventional treatment strategy in human. In this present study, we examined the efficacy of oral administration of N-acetyl l-cysteine (NAC) in limiting arsenic-mediated female reproductive disorders and oxidative stress in female Wistar rats. The treatment was continued for 8 days (2 estrus cycles) on rats with sodium arsenite (10 mg/Kg body weight) orally...
2018: Toxicology Reports
https://www.readbyqxmd.com/read/29464352/preparation-of-tpp-crosslinked-chitosan-microparticles-by-spray-drying-for-the-controlled-delivery-of-progesterone-intended-for-estrus-synchronization-in-cattle
#16
Ignacio M Helbling, Carlos A Busatto, Silvana A Fioramonti, Juan I Pesoa, Liliana Santiago, Diana A Estenoz, Julio A Luna
PURPOSE: Planned reproduction in cattle involves regulation of estrous cycle and the use of artificial insemination. Cycle control includes the administration of exogenous progesterone during 5-8 days in a controlled manner allowing females to synchronize their ovulation. Several progesterone delivery systems are commercially available but they have several drawbacks. The aim of the present contribution was to evaluate chitosan microparticles entrapping progesterone as an alternative system...
February 20, 2018: Pharmaceutical Research
https://www.readbyqxmd.com/read/29457805/urinary-metabolomic-study-of-the-antagonistic-effect-of-p-ginseng-in-rats-with-estrogen-decline-using-ultra-performance-liquid-chromatography-coupled-with-quadrupole-time-of-flight-mass-spectrometry
#17
He Lin, Zhongying Liu, Zifeng Pi, Lihui Men, Weijia Chen, Zhiqiang Liu
Estrogens are biologically active steroid hormones mainly released from the ovary by ovarian secretion of estrogen into the circulating blood to regulate or function at the distal target. Estrogens play an important role in the central nervous system, cardiovascular system and immune system, especially for post-menopausal women. Panax ginseng Mayer has been reported to relieve women's menopausal symptoms and affect estrogen activities. However, the mechanism of its estrogen regulation has not yet been clearly investigated...
February 19, 2018: Food & Function
https://www.readbyqxmd.com/read/29428660/differential-expression-of-the-receptors-for-thyroid-hormone-thyroid-stimulating-hormone-vitamin-d-and-retinoic-acid-and-extracellular-signal-regulated-kinase-in-uterus-of-rats-under-influence-of-sex-steroids
#18
Abu Sadat Md Sayem, Nelli Giribabu, Kamarulzaman Karim, Lay Khiang Si, Sekaran Muniandy, Naguib Salleh
Sex-steroids play important role in modulating uterine functions. We hypothesized that these hormones affect expression of proteins in the uterus related to thyroid hormone action. Therefore, changes in expression levels of receptors for thyroid hormone (TRα-1 and TRβ-1), thyroid stimulating hormone (TSHR), vitamin D (VDR) and retinoid acid (RAR) as well as extracellular signal-regulated kinase (ERK1/2) in uterus were investigated under sex-steroid influence. METHODS: Two rat models were used: (i) ovariectomised, sex-steroid replaced and (ii) intact, at different phases of oestrous cycle...
February 7, 2018: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/29428619/effect-of-dietary-n-3-polyunsaturated-fatty-acid-rich-fish-oil-on-the-endometrial-prostaglandin-production-in-the-doe-capra-hircus
#19
Ravjibhai K Chaudhari, Ajit Singh Mahla, Amit Kumar Singh, Sanjay Kumar Singh, Abhijit M Pawde, G V P P S Ravi Kumar, GyanendraSingh, Mihir Sarkar, Harendra Kumar, Krishnaswamy Narayanan
Recently, we showed that dietary supplementation of n-3 PUFA rich fish oil (FO) decreased the metabolites of serum prostaglandin (PG) F 2α and E 2 during the window of pregnancy recognition in the doe. In this study, we investigated its effect on the changes on endometrial PG production in vitro. Cycling does (n = 12) of Rohilkhand region were divided into two equal groups and fed a concentrate diet supplemented with either FO containing 26% n-3 PUFA (TRT; n = 6) or palm oil (CON; n = 6) @ 0.6 mL/kg body weight for 57 days...
February 8, 2018: Prostaglandins & Other Lipid Mediators
https://www.readbyqxmd.com/read/29427608/comparison-between-male-and-female-rats-in-a-model-of-self-administration-of-a-chocolate-flavored-beverage-behavioral-and-neurochemical-studies
#20
Andrea Contini, Fabrizio Sanna, Paola Maccioni, Giancarlo Colombo, Antonio Argiolas
The existence of sex differences was studied in a rat model of operant self-administration of a chocolate-flavored beverage (CFB), which possesses strong reinforcing properties and is avidly consumed by rats. Whether these differences occurred concomitantly to changes in extracellular dopamine in the dialysate obtained from the nucleus accumbens, was assessed by intracerebral microdialysis. Male, ovariectomized and intact female rats showed similar self-administration profiles, with minor differences in both acquisition and maintenance phases...
February 7, 2018: Behavioural Brain Research
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