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https://www.readbyqxmd.com/read/29334412/stallion-semen-quality-depends-on-mhc-matching-to-teaser-mare
#1
E Jeannerat, E Marti, C Berney, F Janett, H Bollwein, H Sieme, D Burger, C Wedekind
The major histocompatibility complex (MHC) has repeatedly been found to influence mate choice of vertebrates, with MHC-dissimilar mates typically being preferred over MHC-similar mates. We used horses (Equus caballus) to test whether MHC matching also affects male investment into ejaculates after short exposure to a female. Semen characteristics varied much among stallions. Controlling for this variance with a full-factorial within-subject experimental design, we found that a short exposure to an MHC-dissimilar mare enhanced male plasma testosterone and led to ejaculates with elevated sperm numbers as compared to exposure to an MHC-similar mare...
January 15, 2018: Molecular Ecology
https://www.readbyqxmd.com/read/29288976/maternal-parity-affects-placental-development-growth-and-metabolism-of-foals-until-1-year-and-a-half
#2
M Robles, C Dubois, C Gautier, M Dahirel, I Guenon, H Bouraima-Lelong, C Viguié, L Wimel, A Couturier-Tarrade, P Chavatte-Palmer
Primiparous mares are known to produce smaller foals than multiparous mares. This difference seems to be partly explained by the reduced exchange surface and volume of the placental villi in primiparous compared to multiparous placentas. The effect of maternal parity on foals' post-natal growth, metabolism and sexual maturation, however, has been given little consideration. The objectives of this work were to analyse placental biometry and structure at term, growth of foals and yearlings, their metabolism and testicular maturation at one year of age...
December 21, 2017: Theriogenology
https://www.readbyqxmd.com/read/29287623/olfactory-stimulation-or-inhibition-of-sexual-behavior-of-stallions-in-non-breeding-season
#3
Daniel Guillaume, Chantal Moussu, Frédéric de Geoffroy, Didier Chesneau, Matthieu Keller
Stallions show decreased sexual responses and activities during short days in winter. To evaluate the importance of sexual olfactory communication in horses, we tested whether sexual responses could be stimulated through various sexual olfactory stimulations in winter. To this end, we presented stallions with various olfactory stimulations (urine from mares at different stages of the reproductive cycle, urine from stallions or geldings, or chemically defined synthetic odorant) during the non-breeding season and measured their behavioral responses through (1) a test of olfactory investigation (olfactory investigation and flehmen behavior) and (2) a test of sexual activity in the context of semen collection for artificial insemination...
December 26, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/29258708/a-simple-flow-cytometry-protocol-to-determine-simultaneously-live-dead-and-apoptotic-stallion-spermatozoa-in-fresh-and-frozen-thawed-samples
#4
M C Gil, C Ortega Ferrusola, L Anel-López, J M Ortiz-Rodriguez, M Alvarez, P de Paz, L Anel, F J Peña
Spermatozoa undergo apoptotic changes during the cryopreservation process. These changes, recently termed spermptosis, resemble the cryopreservation induced delayed onset of cell death observed after thawing of somatic cells. Due to its importance in cryobiology, methods to easily identify spermptotic cells are warranted. In this study, a well-validated method for identification of spermatozoa with caspase 3 activity was compared with use of the combination of Hoechst 33342 (H-42) and ethidium homodimer (Eth-1)...
December 16, 2017: Animal Reproduction Science
https://www.readbyqxmd.com/read/29223009/influence-of-spermatozoal-lipidomic-profile-on-the-cryoresistance-of-frozen-spermatozoa-from-stallions
#5
T Cabrera, C Ramires-Neto, K R A Belaz, C P Freitas-Dell'aqua, D Zampieri, A Tata, M N Eberlin, M A Alvarenga, F F Souza
The membrane of spermatozoa, which contributes to cellular cryoresistance, contains numerous lipids with a composition that directly affects membrane fluidity and the fertilization process. In light of variations in the degree of sensitivity in equine seminal freezing, this study aimed to correlate equine semen lipids with post-thawing characteristics of spermatozoa. We used ejaculates from 34 stallions, which were evaluated (total motility ≥ 60%), frozen and thawed and reevaluated for motility of spermatozoa, membrane integrity and lipid peroxidation...
November 26, 2017: Theriogenology
https://www.readbyqxmd.com/read/29198956/effects-of-staining-method-and-clinician-experience-on-the-evaluation-of-stallion-sperm-morphology
#6
Ruby Yoana Murcia-Robayo, Eleonore Jouanisson, Guy Beauchamp, Mouhamadou Diaw
Evaluation of sperm morphology is part of the assessment of fertility in human and animal reproduction. Analyses can be performed using different techniques, including the use of staining methods In our prospective study, the morphology of equine sperm was evaluated using 3 staining methods Diff-Quik, eosin-nigrosin, and SpermBlue, the latter being a relatively new stain commonly used for human sperm. Our hypotheses were that (1) SpermBlue allows easier assessment of horse sperm morphology and facilitates better identification of sperm abnormalities, and (2) sperm morphology classification differs depending on the evaluator's experience...
November 29, 2017: Animal Reproduction Science
https://www.readbyqxmd.com/read/29186293/early-histone-h4-acetylation-during-chromatin-remodeling-in-equine-spermatogenesis
#7
Chelsea C Ketchum, Casey D Larsen, Alexis McNeil, Mirella L Meyer-Ficca, Ralph G Meyer
Chromatin remodeling during spermatogenesis culminates in the exchange of nucleosomes for transition proteins and protamines as an important part of spermatid development to give rise to healthy sperm. Comparative immunofluorescence analyses of equine and murine testis histological sections were used to characterize nucleoprotein exchange in the stallion. Histone H4 hyperacetylation is considered a key event of histone removal during the nucleoprotein transition to a protamine-based sperm chromatin structure...
November 25, 2017: Biology of Reproduction
https://www.readbyqxmd.com/read/29182942/does-mntbap-ameliorate-dna-fragmentation-and-in%C3%A2-vivo-fertility-of-frozen-thawed-arabian-stallion-sperm
#8
Kamal Shojaeian, Houshang Nouri, Hamid Kohram
Overproduction of reactive oxygen species during sperm freeze-thawing process leads to membrane lipid peroxidation, DNA damage, motility loss, and subsequent death. This oxidative stress can be alleviated by the addition of some antioxidants to semen extenders prior to freezing. This study was performed to evaluate the in vitro effectiveness of MnTBAP (a cell permeable antioxidant) on stallion sperm freezability and in vivo fertility rate. Twenty-one ejaculates were, collected with missouri model artificial vagina (n = 3 stallions, seven ejaculate each), and diluted (1:2 v/v) with phosphocaseinate base INRA extender, containing 0 (control), 100, 200 and 300 μM of MnTBAP and frozen using acontrolled-rate freezing system...
November 22, 2017: Theriogenology
https://www.readbyqxmd.com/read/29166657/the-effects-of-kinesio-taping-on-the-trajectory-of-the-forelimb-and-the-muscle-activity-of-the-musculus-brachiocephalicus-and-the-musculus-extensor-carpi-radialis-in-horses
#9
Antonia Zellner, Barbara Bockstahler, Christian Peham
BACKGROUND INFORMATION: The present study aimed to investigate the effects of Kinesio Taping on the trajectory of the forelimb and the muscle activity of the M. brachiocephalicus and the M. extensor carpi radialis in horses. 19 horses and ponies of different breeds (body weight: 496±117 kg), gender (8 mares, 10 geldings and 3 stallions) and ages (14.9±6.9 years old) were analysed without Kinesio Tape ("no tape"), with Kinesio Tape (muscle facilitation application on both muscles of both sides, "with tape") and immediately after Kinesio Taping ("post tape") through kinematic motion analysis and surface electromyography on a treadmill at the walk (speed: 1...
2017: PloS One
https://www.readbyqxmd.com/read/29154176/seasonal-changes-in-the-sperm-fatty-acid-composition-of-shetland-pony-stallions
#10
Christine Aurich, Cristina Ortega Ferrusola, Fernando Juan Peña Vega, Nadine Schrammel, David Morcuende, Jörg Aurich
Spermatozoa contain polyunsaturated fatty acids (PUFA). Cryopreservation damages sperm membranes and they become less functional after thawing. We analysed the lipid composition of spermatozoa from Shetland stallions (n = 15) collected monthly from January to June and hypothesized that sperm lipid patterns change with season. In addition, one ejaculate per month was submitted to cryopreservation. Content of saturated palmytic and stearic acid decreased from January to March (p < 0.001) while content of the PUFA docosapentaenoic (p < 0...
November 10, 2017: Theriogenology
https://www.readbyqxmd.com/read/29150368/the-utility-of-ercp-in-pediatric-pancreatic-trauma
#11
Eric H Rosenfeld, Adam M Vogel, Denise B Klinkner, Mauricio Escobar, Barbara Gaines, Robert Russell, Brendan Campbell, Hale Wills, Anthony Stallion, David Juang, Rajan K Thakkar, Jeffrey Upperman, Mubeen Jafri, Randall Burd, Bindi J Naik-Mathuria
BACKGROUND/PURPOSE: Endoscopic retrograde cholangiopancreatography (ERCP) is an adjunct for pediatric pancreatic injury management, but its use and utility in pediatric patients are unclear. We set out to evaluate the use of ERCP and its effects on outcomes. METHODS: A retrospective review was performed for children who had pancreatic injuries at 22 pediatric trauma centers between 2010 and 2015. ERCP details and outcomes were collected. Analysis was performed using descriptive statistics and Wilcoxon rank-sum tests...
October 13, 2017: Journal of Pediatric Surgery
https://www.readbyqxmd.com/read/29146097/descriptive-study-of-current-therapeutic-practices-clinical-reproductive-findings-and-incidence-of-pregnancy-loss-in-intensively-managed-thoroughbred-mares
#12
B V Rose, M Firth, B Morris, J M Roach, D C Wathes, K L P Verheyen, A M de Mestre
Therapeutic practices in equine reproductive medicine have dramatically evolved over the last 20 years but current usage is not described. The aims of this study were to provide a description of medication use and clinical findings of reproductive examinations alongside measures of reproductive efficiency in thoroughbreds. A prospective cohort study was conducted in the 2013 and 2014 breeding seasons. Mare and stallion details, information on veterinary interventions and findings of reproductive ultrasound scans were collected using questionnaires and entered into a custom-designed Microsoft Access database...
November 10, 2017: Animal Reproduction Science
https://www.readbyqxmd.com/read/29141579/a-missense-variant-in-the-coil1a-domain-of-the-keratin-25-gene-is-associated-with-the-dominant-curly-hair-coat-trait-crd-in-horse
#13
Caroline Morgenthaler, Mathieu Diribarne, Aurélien Capitan, Rachel Legendre, Romain Saintilan, Maïlys Gilles, Diane Esquerré, Rytis Juras, Anas Khanshour, Laurent Schibler, Gus Cothran
BACKGROUND: Curly horses present a variety of curl phenotypes that are associated with various degrees of curliness of coat, mane, tail and ear hairs. Their origin is still a matter of debate and several genetic hypotheses have been formulated to explain the diversity in phenotype, including the combination of autosomal dominant and recessive alleles. Our purpose was to map the autosomal dominant curly hair locus and identify the causal variant using genome-wide association study (GWAS) and whole-genome sequencing approaches...
November 15, 2017: Genetics, Selection, Evolution: GSE
https://www.readbyqxmd.com/read/29129877/evaluation-of-the-chemiluminescent-enzyme-immunoassay-system-for-the-measurement-of-testosterone-in-the-serum-and-whole-blood-of-stallions
#14
Yuko Toishi, Nobuo Tsunoda, Shun-Ichi Nagata, Rikio Kirisawa, Kentaro Nagaoka, Gen Watanabe, Yojiro Yanagawa, Seiji Katagiri, Kazuyoshi Taya
Testosterone (T) concentration is a useful indicator of reproductive function in male animals. However, T concentration is not usually measured in veterinary clinics, partly due to the unavailability of reliable and rapid assays for animal samples. In this study, a rapid chemiluminescent enzyme immunoassay system (CLEIA system) that was developed for the measurement of T concentration in humans use was validated for stallion blood samples. First, serum T concentrations were measured using the CLEIA system and compared with those measured by a fluoroimmunoassay that has been validated for use in stallions...
November 11, 2017: Journal of Reproduction and Development
https://www.readbyqxmd.com/read/29126628/effect-of-transportation-on-the-sympatho-adrenal-system-responses-in-horses
#15
Pietro Medica, Giuseppe Bruschetta, Cristina Cravana, Adriana Ferlazzo, Esterina Fazio
The objective of current study was to evaluate the effect of transportation stress on the circulating adrenaline (A), noradrenaline (NA) and dopamine (DA) responses of stallions, according to the different distances. Forty-two stallions were studied before and after road transportation of 100, 200 and 300km, for a period of 1-3h. An increase in plasma A after 100km (P<0.001) was observed. A similar result was seen in plasma NA after 100km (P<0.001), and 300km (P<0.001). Increases in plasma DA after 100 and 200km (P<0...
October 25, 2017: Research in Veterinary Science
https://www.readbyqxmd.com/read/29121172/freezing-induced-uptake-of-disaccharides-for-preservation-of-chromatin-in-freeze-dried-stallion-sperm-during-accelerated-aging
#16
Harriëtte Oldenhof, Miao Zhang, Katharina Narten, Judith Bigalk, Bulat Sydykov, Willem F Wolkers, Harald Sieme
Non-viable freeze-dried sperm have intact chromatin and can be used for fertilization via intracytoplasmic sperm injection. Freeze-dried sperm preferably should be stored at 4°C or lower, because DNA damage accumulates during storage at room temperature. Disaccharides are known to protect biomolecules both during freezing and drying, by forming a highly viscous glassy state. Their use for intracellular protection is challenging because cellular membranes are normally impermeable for disaccharides. In the current study, we demonstrate that membrane impermeable compounds, including lucifer yellow and trehalose, are taken up by stallion sperm when exposed to freezing...
November 7, 2017: Biology of Reproduction
https://www.readbyqxmd.com/read/29115996/serological-evidence-of-equine-arteritis-virus-infection-and-phylogenetic-analysis-of-viral-isolates-in-semen-of-stallions-from-serbia
#17
Sava Lazić, Diana Lupulović, Delphine Gaudaire, Tamas Petrovic, Gospava Lazić, Aymeric Hans
BACKGROUND: Equine arteritis virus (EAV) is responsible for infections in equids. It can spread easily within the horse population and has a major impact on the horse breeding industry. No EAV outbreak has ever been reported in Serbia. To determine whether EAV is nonetheless circulating there, especially in the Vojvodina region, 340 horse serum samples were subjected to serology testing to detect EAV antibodies. In parallel, semen samples from three seropositive stallions were collected to evaluate their EAV status, using RT-qPCR and virus isolation on cell culture...
November 7, 2017: BMC Veterinary Research
https://www.readbyqxmd.com/read/29112778/clinical-application-of-hysteroscopic-hydrotubation-for-unexplained-infertility-in-the-mare
#18
Y Inoue, M Sekiguchi
BACKGROUND: Therapeutic techniques for oviductal obstruction in the mare are limited. Non-surgical and retrograde flushing may be an attractive alternative to current treatment methods for oviductal blockage. OBJECTIVES: To evaluate hysteroscopic selective hydrotubation as a treatment option for presumptive equine oviductal blockage. STUDY DESIGN: Retrospective case series. METHODS: Ten ml of saline was flushed through the oviducts in 28 standing sedated mares, which had reproductive histories of unexplained subfertility, by inserting a catheter into the uterotubal junction under endoscopic guidance...
November 7, 2017: Equine Veterinary Journal
https://www.readbyqxmd.com/read/29052325/first-evidence-for-the-presence-of-aquaporins-in-stallion-sperm
#19
S Bonilla-Correal, F Noto, E Garcia-Bonavila, J E Rodríguez-Gil, M Yeste, J Miro
Aquaporins (AQPs) are transmembrane proteins found in all cells and are responsible for the transport of water and small solutes. While these proteins have been found in the spermatozoa of humans, rodents, pigs and cattle, where not only do they play a role for the regulation of sperm volume but are also related with the sperm resilience to withstand freeze-thawing procedures, their presence in stallion sperm is yet to be reported. Therefore, the objectives of this work were as follows: (i) to determine whether AQP3, AQP7 and AQP11 are present in stallion sperm and (ii) to investigate whether the relative amounts of these three AQPs play any role in the cryopreservation success...
October 2017: Reproduction in Domestic Animals, Zuchthygiene
https://www.readbyqxmd.com/read/29047357/effects-of-inbreeding-and-other-systematic-effects-on-fertility-of-black-forest-draught-horses-in-germany
#20
Maarit Müller-Unterberg, Sandra Wallmann, Ottmar Distl
BACKGROUND: The Black Forest Draught horse (BFDH) is an endangered German coldblood breed with its origin in the area of the Black Forest in South Germany. In this retrospective study, the influence of the inbreeding coefficient on foaling rates was investigated using records from ten breeding seasons. Due to the small population size of BFDH, the level of inbreeding is increasing and may have an effect on foaling rates.The data of the present study included all coverings reported for 1024 BFDH mares in the years 2001-2009...
October 18, 2017: Acta Veterinaria Scandinavica
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