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Animal Reproduction Science

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https://www.readbyqxmd.com/read/29037850/comparison-of-dna-fragmentation-of-frozen-thawed-epididymal-sperm-of-dogs-using-sperm-chromatin-structure-analysis-and-sperm-chromatin-dispersion-test
#1
I Ortiz, M Urbano, J Dorado, J M Morrell, E Al-Essawe, A Johannisson, M Hidalgo
The aim of this study was to compare sperm DNA fragmentation of frozen-thawed epididymal sperm of dogs using the SCSA (Sperm Chromatin Structure Assay) and SCDt (Sperm Chromatin Dispersion test). For this purpose, epididymis from neutered dogs were minced and incubated in a Tris-based extender. The recovered sperm were frozen in a two-step cooling protocol with Tris-based, egg yolk extender and increasing glycerol concentrations, and stored in liquid nitrogen. After thawing, each replica was incubated at 38°C for 24h...
October 12, 2017: Animal Reproduction Science
https://www.readbyqxmd.com/read/29033117/ptger2-activation-induces-ptgs-2-and-growth-factor-gene-expression-in-endometrial-epithelial-cells-of-cattle
#2
Long Gao, Bo Liu, Wei Mao, Ruifeng Gao, Shuangyi Zhang, Duritahala, Changqi Fu, Yuan Shen, Ying Zhang, Nan Zhang, Jindi Wu, Yang Deng, Xing Wu, Jinshan Cao
The prostaglandin E2 receptor 2 (PTGER2) is present in the endometrium and its gene expression is accompanied with endometrial growth, however, it is unknown whether there is endometrial repair through stimulation of growth factor gene expression that is promoted by PTGER2 activation in cattle. The aim of this study was to investigate whether PTGER2 activation can induce prostaglandin-endoperoxide synthase-2 (PTGS-2) and growth factor gene expression by activating PKA and ERK signaling pathways in endometrial epithelial cells of cattle...
October 10, 2017: Animal Reproduction Science
https://www.readbyqxmd.com/read/29029872/inhibition-of-deubiquitinases-alters-gamete-ubiquitination-states-and-sperm-oocyte-binding-ability-in-pigs
#3
Yang Wang, Lili Zhuang, Xuan Chen, Man Xu, Zuochen Li, Yi Jin
This study was undertaken to investigate the dynamics of protein ubiquitination in pig gametes and their micro-environments, as well as to explore the action of deubiquitinases (DUBs) in sperm-oocyte binding. Protein ubiquitination states were evaluated by in the ejaculated sperm, seminal plasma, epididymal sperm, oocytes, zona pellucida (ZP) and follicular fluid (FF) by western blotting. Different concentrations of PR-619, a non-selective inhibitor of DUBs, were used to treat oocytes during in vitro maturation (IVM), the maturation rate, amount of ubiquitinated ZP proteins, and ZP solubility were assessed...
October 7, 2017: Animal Reproduction Science
https://www.readbyqxmd.com/read/29029875/oxytocin-is-not-involved-in-luteolysis-and-early-maternal-recognition-of-pregnancy-mrp-in-alpacas
#4
Michela Ciccarelli, Muhammad Salman Waqas, James K Pru, Ahmed Tibary
Pregnancy maintenance depends on the maternal recognition of pregnancy (MRP), a physiological process by which the lifespan of the corpus luteum is prolonged. This mechanism is not well characterized in camelids. The objectives of the present research were to determine if exogenous oxytocin prolongs the corpus luteum activity in alpacas and to evaluate expression and localization of oxytocin receptors within the endometrium at 9 and 14days post-mating. In the oxytocin studies, plasma progesterone profiles were determined after ovulation in the same alpacas on 2 cycles: one cycle without oxytocin treatment and one cycle with oxytocin treatment...
October 6, 2017: Animal Reproduction Science
https://www.readbyqxmd.com/read/29029874/sperm-subpopulations-in-ejaculated-sperm-and-spermatozoa-recovered-from-ovine-epididymides-up-to-48h-after-death
#5
Tácia Gomes Bergstein-Galan, Romildo Romualdo Weiss, Luiz Ernandes Kozicki, Sony Dimas Bicudo
The objectives of this study were threefold: to identify subpopulations of sperm based on the kinetics of frozen/thawed sheep epididymal spermatozoa or semen collected with an artificial vagina; to evaluate the effects on sperm subpopulations in the thawed samples of post mortem storage at room temperature and the addition of 20% of seminal plasma to the freezing extender and to correlate the percentage of subpopulations with gestation rate following artificial intrauterine insemination. The categorization of the subpopulations was based on sperm kinetic data from Computer Assisted Sperm Analysis (CASA)...
October 5, 2017: Animal Reproduction Science
https://www.readbyqxmd.com/read/29029873/prediction-of-calving-time-in-dairy-cattle
#6
Fadul Mahmoud, Bogdahn Christopher, Alsaaod Maher, Hüsler Jürg, Starke Alexander, Steiner Adrian, Hirsbrunner Gaby
This prospective study was carried out to predict the calving time in primiparous (n=11) and multiparous (n=22) Holstein-Friesian cows using the combination of data obtained from the RumiWatch noseband-sensor and 3D-accelerometer. The animals included in the study were fitted with the RumiWatch noseband-sensor and 3D-accelerometer at least 10days before the expected calving day. The calving event was defined as the time of the first appearance of the calves' feet outside the vulva, and this moment was determined by farm staff and/or confirmed by video monitor...
October 5, 2017: Animal Reproduction Science
https://www.readbyqxmd.com/read/29017744/effect-of-season-on-follicular-population-quality-and-nuclear-maturation-of-bovine-oocytes-under-tropical-conditions
#7
Jorge Alonso Peralta-Torres, Jesús Ricardo Aké-López, José Candelario Segura-Correa, Jesús Ricardo Aké-Villanueva
The aim was to determine the effect of season of the year and the presence of a corpus luteum (CL) on follicular population (FP) and the quality of the oocytes, and of season on nuclear maturation of the bovine oocytes under tropical conditions. Three seasons were evaluated: hot-dry (March-June), hot-humid (July-October) and fresh-humid (November-February). In a first study, 1112 bovine ovaries were obtained from a local slaughterhouse. Follicles were classified as small (≤4mm), middle (4.1-8mm) and large (≥8...
October 5, 2017: Animal Reproduction Science
https://www.readbyqxmd.com/read/29032866/hsp90-maintains-boar-spermatozoa-motility-and-mitochondrial-membrane-potential-during-heat-stress
#8
V Calle-Guisado, M J Bragado, L J García-Marín, L González-Fernández
Heat Shock Proteins (HSP) is a family of proteins that protects cells from high temperatures. The present work aimed to elucidate the role that HSP90 exerts on boar sperm incubated under heat stress conditions on viability, total motility (TM), progressive motility (PM), acrosome status, mitochondrial membrane potential and plasma membrane lipid organization. Sperm were incubated in non-capacitating conditions (Tyrode's basal medium or TBM) for 3, 8 and 24h or in capacitating conditions (Tyrode's complete medium or TCM) for 4h at 38...
September 29, 2017: Animal Reproduction Science
https://www.readbyqxmd.com/read/28919028/resumption-of-ovarian-function-the-metabolic-profile-and-body-condition-in-brahman-cows-bos-indicus-is-not-affected-by-the-combination-of-calf-separation-and-progestogen-treatment
#9
Ramiro Díaz, Carlos S Galina, Ivette Rubio, Manuel Corro, José Luis Pablos, Ana Rodríguez, Agustín Orihuela
To evaluate the effect of different calf separation procedures after a progestogen treatment on the resumption of ovarian function, body condition and metabolic profile, 59 multiparous Brahman cows grazing on a mixed grass pasture were studied. No supplementation was given at any time. Body condition score (BCS), fat thickness (FAT) and blood metabolites were measured fortnightly from the beginning of the last trimester of gestation until 96days postpartum. At 30days postpartum all animals received a progesterone (P4)-releasing device (CIDR) which was withdrawn 9days later when prostaglandin F2α was applied...
September 1, 2017: Animal Reproduction Science
https://www.readbyqxmd.com/read/28784317/comparison-of-visual-and-computerized-estrous-detection-and-evaluation-of-influencing-factors
#10
Ina Gaude, Andreas Kempf, Klaas Dietrich Strüve, Martina Hoedemaker
The aim of this study was to compare the automatic estrous detection system (AED) Heatime(®) with visual estrous detection (VED). The study was conducted on 139 Holstein Friesian cows in one dairy herd in Northern Germany. The cows were fitted with activity collars from d 21 postpartum until d 40 of gestation and a 30-min visual estrous observation was conducted three times a day. In addition, as a separate part of the VED, estrous detection by exclusive consideration of standing estrus (SE) was investigated...
July 29, 2017: Animal Reproduction Science
https://www.readbyqxmd.com/read/28779946/fertility-disturbances-of-dimethylacetamide-and-glycerol-in-rooster-sperm-diluents-discrimination-among-effects-produced-pre-and-post-freezing-thawing-process
#11
F M K Abouelezz, M A M Sayed, J Santiago-Moreno
With avian sperm cryopreservation protocols, the most widely used cryoprotectants (CPAs) are the glycerol (GLY; in gradual freezing: in-straw freezing method), and the dimethylacetamide (DMA; in pellets by plunging into liquid nitrogen: in-pellet rapid freezing method). Use of both methods results in a small portion of thawed live sperm with lesser fertilizing ability compared with the semen samples immediately after collection. This study was conducted to assess the pre-freezing damage occurring to the sperm due to the interaction with the cryoprotectants (CPAs) GLY (8%) and DMA (5%), as well as the post-freezing damage resulting from both freezing methods Data for each treatment, in fresh and frozen-thawed samples, were compared for sperm motility, fertilizing capacity and sperm-egg penetration holes/germinal disc (SP holes/GD)...
July 29, 2017: Animal Reproduction Science
https://www.readbyqxmd.com/read/28778622/integrity-of-head-and-tail-plasmalemma-is-associated-with-different-kinetic-variables-in-boar-sperm
#12
Adéla Grieblová, Eliana Pintus, José Luis Ros-Santaella
An intact and functional sperm plasmalemma has a major role in sperm motility and fertilizing capacity. Several techniques have been developed to evaluate the integrity of the sperm plasma membrane, but there are still some inconsistencies concerning the methods that are more closely associated with sperm function. In this study, the aim was to: i) evaluate the integrity of the boar sperm plasmalemma during 72h of semen storage at 17°C using four techniques: eosin/nigrosin (E/N), propidium iodide/carboxyfluorescein diacetate (PI/CFDA), hypo-osmotic swelling test (HOST), and combined HOST with eosin staining (HOST/E), ii) assess the correlations and the limits of consistency among these techniques, iii) and estimate the relationships with the acrosomal status and sperm kinetics...
July 29, 2017: Animal Reproduction Science
https://www.readbyqxmd.com/read/28781155/hyaluronic-acid-improves-frozen-thawed-sperm-quality-and-fertility-potential-in-rooster
#13
Saied Lotfi, Morteza Mehri, Mohsen Sharafi, Reza Masoudi
Beneficial effects of Hyaluronic acid (HA) has not been yet assessed for cryopreservation of rooster sperm. This study was conducted to evaluate the effects of different concentrations of HA (0, 1, 2, 4 and 8mM) in Beltsville extender on the cryopreservation of rooster sperm. Semen samples were collected from six Ross broiler breeders (24-week) using abdominal massage, then divided into five equal aliquots and cryopreserved in Beltsville extender that contained different concentrations of HA. Motion characteristics, morphology, membrane functionality, viability, acrosome integrity, lipid peroxidation and fertility potential of sperm were assessed after thawing...
July 25, 2017: Animal Reproduction Science
https://www.readbyqxmd.com/read/28765035/effects-of-adding-different-levels-of-glutamine-to-modified-beltsville-extender-on-the-survival-of-frozen-rooster-semen
#14
Aytak Bakhshayesh Khiabani, Gholamali Moghaddam, Hossein Daghigh Kia
The aim of the present study was to investigate the effects of l-glutamine on the quality of frozen-thawed rooster semen. Semen samples were collected from eight mature roosters (Ross 308). After initial semen assessments, samples of adequate quality were mixed together and diluted with modified Beltsville extender without l-glutamine (control) and supplemented with 2.5, 5, and 7.5mM l-glutamine. Semen straws were subjected to cryopreservation and evaluated twice at 15-day intervals. After thawing, sperm viability, total and progressive sperm motilities were measured by Eosin-Nigrosine and Computer-Aided Sperm Analysis (CASA), respectively...
July 25, 2017: Animal Reproduction Science
https://www.readbyqxmd.com/read/28765033/assessment-of-butorphanol-azaperone-medetomidine-combination-as-anesthesia-for-semen-collection-and-evaluation-of-semen-quality-in-white-tailed-deer-odocoileus-virginianus
#15
S M Kirschner, R Rodenkirch
The aim of this current study was to evaluate the level of anesthesia produced by a combination of butorphanol-azaperone-medetomidine (BAM) for semen collection by electroejaculation on captive white-tailed bucks (Odocoileus virginianus). Ten male white-tailed deer, weighing 68.2-115.9kg, ranging in age from one to four years were randomly selected from housing pens and anesthetized with the BAM drug combination at a dose volume of 2.0mL each. Semen was collected from each animal using a standard cervid electroejaculation protocol while under BAM anesthesia...
July 25, 2017: Animal Reproduction Science
https://www.readbyqxmd.com/read/28760664/effect-of-11%C3%AE-hydroxyandrostenedione-on-european-whitefish-coregonus-lavaretus-linnaeus-1758
#16
Jarosław Król, Piotr Hliwa, Adam Polewacz, Agnieszka Stabińska, Stefan Dobosz, Konrad Ocalewicz
The goal of the present research was to evaluate the efficiency of 11β-hydroxyandrostenedione (OHA) applied in the diet to achieve sex reversal in the European whitefish (Coregonus lavaretus). At 32day post-hatching, fish were reared in four groups: fish fed with 10ppm of OHA (10 OHA), fish fed with 20ppm of OHA (20 OHA), fish fed without OHA (C) and fish fed without OHA and reared in the water from 20 OHA group (R). The experimental groups were conducted in separate recirculation systems and the first phase of the experiment lasted 63days...
July 25, 2017: Animal Reproduction Science
https://www.readbyqxmd.com/read/28982519/nanos2-is-a-molecular-marker-of-inchoate-buffalo-spermatogonia
#17
Meng-Qi Li, Ao-Lin Luo, Peng-Wei Zhao, Ting-Ting Li, Shuang-Shuang Geng, Xing-Wei Liang, Hui-Yan Xu, Yang-Qing Lu, Sheng-Sheng Lu, Xiao-Gan Yang, Ke-Huan Lu
Nanos2 belongs to the Nanos gene-coding family and is an important RNA-binding protein that has been shown to have essential roles in male germline stem cells development and self-renewal in mouse. However, little is known about Nanos2 in inchoate buffalo spermatogonia. Here, rapid-amplification of cDNA ends (RACE) was used to obtain the full-length buffalo Nanos2 sequence and bioinformatic analysis revealed a highly conserved Nanos2 sequence between buffalo and other mammalian species. Although Nanos2 was expressed in various tissues, the highest mRNA expression levels were found in testes tissue...
November 2017: Animal Reproduction Science
https://www.readbyqxmd.com/read/28969874/fetal-sex-alters-maternal-anti-mullerian-hormone-during-pregnancy-in-cattle
#18
Anja Stojsin-Carter, Nathalia N Costa, Rodrigo De Morais, Tiago H De Bem, Mayra P Costa, Timothy F Carter, Daniel J Gillis, Michael S Neal, Otavio M Ohashi, Moyses S Miranda, Flavio V Meirelles, Laura A Favetta, W Allan King
Anti-Mullerian hormone (AMH) is expressed by both male and female fetuses during mammalian development, with males expressing AMH earlier and at significantly higher concentration. The aim of the current study was to explore the potential impact of pregnancy and fetal sex on maternal AMH and to determine if plasma (Pl) AMH or placenta intercotyledonary membrane and cotyledonary AMH receptor 2 (AMHR2) mRNA expression differ in pregnant cows carrying male vs. female fetuses. AMH levels in blood were measured using a bovine optimized ELISA kit...
November 2017: Animal Reproduction Science
https://www.readbyqxmd.com/read/28967452/current-status-of-the-role-of-endothelins-in-regulating-ovarian-follicular-function-a-review
#19
REVIEW
J M Ervin, L F Schütz, L J Spicer
Endothelins (EDN) are a group of vasoactive 21 amino acid peptides reported to play roles in steroidogenesis, folliculogenesis, and ovulation. EDN1, EDN2 and EDN3 have all been shown to affect granulosa cell (GC) function in a variety of mammalians species. Herewithin, the role of EDN in regulating steroidogenesis and ovarian follicular development is reviewed, focusing on the localization and function of EDN and their receptors in ovarian follicular function emphasizing species differences. For example, in single ovulating species such as humans and cattle, in the presence of trophic hormones such as FSH and IGF1, EDN1 and EDN2 significantly inhibited GC estradiol production in 2 of 4 studies, while no effect was observed for GC progesterone production in 2 of 4 studies...
November 2017: Animal Reproduction Science
https://www.readbyqxmd.com/read/28951025/improvement-of-liquid-stored-boar-semen-quality-by-removing-low-molecular-weight-proteins-and-supplementation-with-%C3%AE-tocopherol
#20
M Zakošek Pipan, J Mrkun, A Nemec Svete, P Zrimšek
Seminal plasma contains low-molecular weight components that can exert a harmful effect on sperm function. We have evaluated the effects of removing low-molecular weight components from seminal plasma and adding α-tocopherol on boar semen quality after 72h of liquid storage. Semen was evaluated on the basis of motility, morphology, acrosome integrity, plasma membrane modifications, mitochondrial activity, DNA fragmentation and lipid peroxidation. Thiobarbituric acid reactive substances (TBARS), 8-isoprostane, and antioxidant status (total antioxidant capacity (TAC) and superoxide dismutase activity (SOD)) were measured in seminal plasma...
November 2017: Animal Reproduction Science
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