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https://www.readbyqxmd.com/read/28822903/uterine-clinical-findings-fertility-rate-leucocyte-migration-and-cox-2-protein-levels-in-the-endometrial-tissue-of-susceptible-mares-treated-with-platelet-rich-plasma-before-and-after-ai
#1
Lorenzo G Segabinazzi, Aime M Friso, Sebastian B Correal, André M Crespilho, José Antonio Dell'Aqua, Jordi Miró, Frederico O Papa, Marco Antonio Alvarenga
Persistent mating-induced endometritis (PMIE) results in decreased fertility in horses, thereby causing a significant impact in the horse market. Platelet-rich plasma (PRP), a modulator of the inflammatory response, has been largely used in veterinary medicine. Here, we investigated the effects of PRP on uterine inflammation, conception rate, endometrial polymorphonuclear neutrophil (PMN) migration, and COX-2 protein levels in the endometrial tissue. Thirteen PMIE-susceptible mares were used for artificial insemination (AI)...
August 12, 2017: Theriogenology
https://www.readbyqxmd.com/read/28822776/assessment-of-ovarian-follicular-dynamics-and-folliculogenesis-associated-endocrine-profiles-following-gonadotropin-stimulation-in-the-bonnet-monkey
#2
Bhupathi Sukesh, Muraly Puttabyatappa, Augustine T Peter, Rudraiah Medhamurthy, Polani B Seshagiri
We evaluated ovarian follicular dynamics in bonnet monkeys by employing trans-abdominal ultrasonography. Following the administration of human follicle stimulating hormone (hFSH) and/or human menopausal gonadotropin (hMG), multiple follicular development was assessed and their numbers, size and growth profiles were monitored. The ultrasonograms showed that the follicular antrum appeared distinctly anechoic with well-defined hyperechoic borders. Depending on the type, quantity (12.5-25 IU), and duration (6-9 days) of hormones administered, the number of developing follicles was 2-12 per ovary with their lowest diameter being 2 mm...
August 16, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/28818583/timing-of-fertile-period-for-successful-pregnancy-in-american-bully-dogs
#3
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/28815566/maturation-promoting-factor-destabilization-mediates-human-chorionic-gonadotropin-induced-meiotic-resumption-in-rat-oocytes
#4
Meenakshi Tiwari, Shail K Chaube
Human chorionic gonadotropin (hCG) mimics the action of luteinizing hormone (LH) and triggers meiotic maturation and ovulation in mammals. The mechanism by which hCG triggers meiotic resumption in mammalian oocytes remains poorly understood. We aimed to find out the impact of hCG surge on morphological changes, adenosine 3',5'-cyclic monophosphate (cAMP), guanosine 3',5'-cyclic monophosphate (cGMP), cell division cycle 25B (Cdc25B), Wee1, early mitotic inhibitor 2 (Emi2), anaphase-promoting complex/cyclosome (APC/C), meiotic arrest deficient protein 2 (MAD2), phosphorylation status of cyclin-dependent kinase 1 (Cdk1), its activity and cyclin B1 expression levels during meiotic resumption from diplotene as well as metaphase-II (M-II) arrest in cumulus oocyte complexes (COCs)...
August 16, 2017: Development, Growth & Differentiation
https://www.readbyqxmd.com/read/28814191/maternal-overweight-disrupts-the-sexual-maturation-of-the-offspring
#5
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
#6
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/28813095/evaluation-of-cell-proliferation-and-endometrial-thickness-of-bitches-in-different-periods-of-diestrus
#7
Vanessa S A Gossler, Francislaine A G Santos, Aline R DE Azevedo, Priscila C Gonçalves, Hugo A Rigolo, Cleonice Trevisan, Ana Paula B Masseno, Ana Paula M M Cardoso, Paula C Papa, Caliê Castilho, Ines C Giometti
This study aimed to determine the histological features of the endometrium of bitches, as well as the cell proliferation at specific moments of diestrus, 10, 20, 30, 40, 50 and 60 days post ovulation, correlating the endometrial thickness with the uterine cell proliferation and the metabolic state (weight, blood glucose and plasma cholesterol) of the animals. Therefore, the right and left uterine horns of 26 clinically healthy bitches submitted to ovariohysterectomy were histologically analyzed 10, 20, 30, 40, 50 and 60 days post ovulation...
August 14, 2017: Anais da Academia Brasileira de Ciências
https://www.readbyqxmd.com/read/28809827/a-method-for-characterizing-embryogenesis-in-arabidopsis
#8
Jinlin Feng, Ligeng Ma
Given the highly predictable nature of their development, Arabidopsis embryos have been used as a model for studies of morphogenesis in plants. However, early stage plant embryos are small and contain few cells, making them difficult to observe and analyze. A method is described here for characterizing pattern formation in plant embryos under a microscope using the model organism Arabidopsis. Following the clearance of fresh ovules using Hoyer's solution, the cell number in and morphology of embryos could be observed, and their developmental stage could be determined by differential interference contrast microscopy using a 100X oil immersion lens...
August 4, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28808767/identification-and-expression-analysis-of-micrornas-during-ovule-development-in-rice-oryza-sativa-by-deep-sequencing
#9
Ya Wu, Liyu Yang, Meiling Yu, Jianbo Wang
MicroRNA (miRNA) expression profiles during rice ovule development revealed the possible miRNA-mediated regulation between ovule sporophytic tissue and female gametophyte and the involvement of miRNAs in programmed cell death. MiRNAs are 20-24-nucleotide small RNAs that play key roles in the regulation of many growth and developmental processes in plants. Rice ovule development comprises a series of biological events, which are regulated by complex molecular mechanisms. To gain insight into miRNA-mediated regulation of rice ovule development, Illumina sequencing was used to examine the expression of miRNAs from the megaspore mother cell meiosis stage to the fertilized ovule stage...
August 14, 2017: Plant Cell Reports
https://www.readbyqxmd.com/read/28808540/who-s-my-daddy-considerations-for-the-influence-of-sexual-selection-on-multiple-paternity-in-elasmobranch-mating-systems
#10
Kady Lyons, Chris L Chabot, Christopher G Mull, Corinne N Paterson Holder, Christopher G Lowe
Polyandry resulting in multiply-sired litters has been documented in the majority of elasmobranch species examined to date. Although commonly observed, reasons for this mating system remain relatively obscure, especially in batoids. The round stingray (Urobatis halleri) is an abundant, well-studied elasmobranch distributed throughout the northeastern Pacific that we used to explore hypotheses regarding multiple paternity in elasmobranchs. Twenty mid- to late-term pregnant females were sampled off the coast of southern California and their litters analyzed for the occurrence of multiple paternity using five nuclear microsatellite loci...
August 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28808086/a-pharmacological-study-of-arabidopsis-cell-fusion-between-the-persistent-synergid-and-endosperm
#11
Kazuki Motomura, Tomokazu Kawashima, Frédéric Berger, Tetsu Kinoshita, Tetsuya Higashiyama, Daisuke Maruyama
Cell fusion is a pivotal process in fertilization and multinucleate cell formation. A plant cell is ubiquitously surrounded by hard cell wall, and very few cell fusions have been observed except for gamete fusions. We recently reported that the fertilized central cell (the endosperm) absorbs the persistent synergid, a highly differentiated cell necessary for pollen tube attraction. The synergid-endosperm fusion (SE fusion) appears to eliminate the persistent synergid from fertilized ovule in Arabidopsis thaliana Here, we analyzed the effects of various inhibitors on SE fusion by an in vitro-culture system...
August 14, 2017: Journal of Cell Science
https://www.readbyqxmd.com/read/28806625/association-of-changes-among-body-condition-score-during-the-transition-period-with-nefa-and-bhba-concentrations-milk-production-fertility-and-health-of-holstein-cows
#12
R V Barletta, M Maturana Filho, P D Carvalho, T A Del Valle, A S Netto, F P Rennó, R D Mingoti, J R Gandra, G B Mourão, P M Fricke, R Sartori, E H Madureira, M C Wiltbank
Our objective was to evaluate the association between body condition score (BCS) change during the transition period with fertility, non-esterified fatty acids (NEFA) and beta-hydroxybutyrate (BHBA) concentrations, milk yield, and health problems of Holstein cows in a retrospective cohort study. Holstein cows (n = 232) were assessed for BCS (5 point scale; 0.25 point increments) and had blood collected at 21 and 7 d before, on the day of, and 7 and 21 d after calving. Blood samples were assayed for NEFA and BHBA concentrations...
July 27, 2017: Theriogenology
https://www.readbyqxmd.com/read/28805910/evaluation-of-an-intravaginal-triptorelin-acetate-gel-for-inducing-ovulation-in-mares
#13
C D Sinclair, S K Webel, T L Douthit, L W Murray, A L Jager, D M Grieger, J M Kouba
The objective of these studies was to investigate the efficacy of an intravaginal triptorelin acetate (TA) gel as an ovulation-inducing agent in mares. In Exp. 1, 24 mares were blocked using a combination of parity and age and randomly assigned to 1 of 3 treatment groups: 5 mL TA gel (TA5), 10 mL TA gel (TA10), or 5 mL vehicle gel only (CON). Following the appearance of a follicle ≥ 25 mm, a blood sample was obtained for measurement of LH from each mare every 24 h until treatment administration. When a follicle ≥ 35 mm was observed, treatments were administered intravaginally...
August 2017: Journal of Animal Science
https://www.readbyqxmd.com/read/28804932/kisspeptin-regulates-ovarian-steroidogenesis-during-delayed-embryonic-development-in-the-fruit-bat-cynopterus-sphinx
#14
Anuradha, Amitabh Krishna
Cynopterus sphinx, a fruit bat, undergoes delayed embryonic development during the winter months, a period that corresponds to low levels of progesterone and estradiol synthesis by the ovary. Kisspeptins (KPs) are a group of neuropeptide hormones that act via G-protein coupled receptor 54 (GPR54) to stimulate hypothalamic secretion of Gonadotropin-releasing hormone, thereby regulating ovarian steroidogenesis, folliculogenesis, and ovulation. GPR54 is also expressed in the ovary, suggesting a direct role for KPs in ovarian steroidogenesis...
August 14, 2017: Molecular Reproduction and Development
https://www.readbyqxmd.com/read/28803019/daily-lying-behavior-of-lactating-holstein-cows-during-an-estrus-synchronization-protocol-and-its-associations-with-fertility
#15
B F Silper, A M L Madureira, L B Polsky, S Soriano, A F Sica, J L M Vasconcelos, R L A Cerri
Objectives were to quantify lying behavior (LB) during an estradiol and progesterone-based synchronization protocol, to assess risk factors for ovulation, pregnancy per AI (P/AI), and degree of behavioral change at estrus, and to investigate the associations between estrus LB and walking activity. Holstein cows (43.6 ± 11.0 kg of milk/d) were fitted with leg-mounted accelerometers. Total lying time/d (L_time), bout frequency (bout_N), average lying bout duration, and relative increase in walking activity (ACT%) were evaluated for 1,411 timed artificial insemination events...
August 9, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28803006/genetic-analysis-of-new-progesterone-based-fertility-traits-in-dairy-cows-measured-on-farm
#16
Diana Sorg, Monika Wensch-Dorendorf, Kati Schöpke, Gunter Martin, Renate Schafberg, Nicole Reinhold, Steffen Pache, Hermann Swalve
The objectives of this study were (1) to analyze the agreement of a standard laboratory ELISA for progesterone (P4) with an automated on-farm ELISA kit operated under commercial conditions in 1,297 milk samples from 50 dairy cows; (2) to study the influence of the method of detection of luteal activity on genetic parameters of fertility traits based on P4 measured with an automated on-farm ELISA once weekly from wk 3 to 9 postpartum in the milk of 1,304 cows; and (3) to study the influence of sampling frequency (once or twice weekly from wk 3 to 9) on the same traits from 296 cows...
August 9, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28801854/how-do-red-and-infrared-low-level-lasers-affect-folliculogenesis-cycle-in-rat-s-ovary-tissue-in-comparison-with-clomiphene-under-in-vivo-condition
#17
Paria Naseri, Alireza Alihemmati, Seyed Hossein Rasta
Folliculogenesis is a cycle that produces the majority of oocyte. Any disruption to this cycle leads to ovulation diseases, like polycystic ovarian syndrome (PCOS). Treatments include drugs and surgery; lasers have also been used complementarily. Meanwhile, still there is no definite treatment for PCOS. This study investigated the photo-bio stimulation effect of near-infrared and red low-level laser on producing follicles and compared the result with result of using common drug, clomiphene. Therefore, the aim of this study was to propose the use of lasers autonomously treatment...
August 11, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28801297/-effect-of-metformin-on-insulin-resistance-during-catch-up-growth-in-mice-with-fetal-growth-restriction
#18
Ping Peng, Chun-Ling Ma, Shu-Mei Wan, Wen-Sheng Jin, Yan Gao, Tian-Qing Huang, Qi Cheng, Chang-Lan Ye
OBJECTIVE: To study the efficacy of metformin intervention on insulin resistance during catch-up growth in mice with fetal growth restriction (FGR). METHODS: Mouse models of FGR were established by low protein diet feeding of the pregnant mice. Both the newborn female mice with FGR and normal control (NC) mice were randomized for feeding with a standard diet (SF) or a high-fat diet (HF) after weaning and treatment with gavage of either metformin or normal saline...
August 20, 2017: Nan Fang Yi Ke da Xue Xue Bao, Journal of Southern Medical University
https://www.readbyqxmd.com/read/28801053/cervical-mucus-and-contraception-what-we-know-and-what-we-don-t
#19
REVIEW
Leo Han, Rebecca Taub, Jeffrey T Jensen
The properties of cervical mucus vary in response to both natural and artificial hormonal changes. During ovulatory cycles, cervical mucus becomes increasingly fluid and favorable to sperm penetration as estradiol levels increase. Following ovulation, as estradiol levels decrease and progesterone increases, the mucus increases in viscosity and becomes impenetrable to sperm. Cervical mucus thickening also occurs in response to synthetic progestins administered by various routes, and this is commonly believed to represent the essential contraceptive mechanism of progestin-only methods that do not block ovulation...
August 8, 2017: Contraception
https://www.readbyqxmd.com/read/28796907/likelihood-of-pregnancy-after-embryo-transfer-is-reduced-in-recipient-mares-with-a-short-preceding-oestrus
#20
J Cuervo-Arango, A N Claes, M Ruijter-Villani, T A Stout
BACKGROUND: Previous surveys reported a positive association between the length of the follicular phase and subsequent fertility in embryo transfer donor and Thoroughbred mares. However, it is unclear whether a longer oestrus positively influences fertilisation and oviductal development (oocyte quality, oviductal environment), or uterine receptivity and survival of the embryo in the uterus. OBJECTIVES: To determine the effect of length of oestrus (characterised by duration of endometrial oedema) on likelihood of pregnancy and early embryo loss (EEL) in recipient mares after embryo transfer (ET)...
August 10, 2017: Equine Veterinary Journal
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