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Equine reproduction

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https://www.readbyqxmd.com/read/28803166/advanced-age-in-mares-affects-endometrial-secretion-of-arachidonic-acid-metabolites-during-equine-subclinical-endometritis
#1
Marta J Siemieniuch, Katarzyna Gajos, Roland Kozdrowski, Marcin Nowak
Even if mares continue to breed up to an advanced age, in aging mares reproductive failure is quite common. Subclinical endometritis, which occurs more often in aging mares than in younger counterparts, may cause prolongation or shortening of the inter-estrus period or the corpus luteum lifespan. We hypothesized that during subclinical endometritis the secretion of selected arachidonic acid metabolites may differ in aging mares compared to younger females. To verify this thesis, ex vivo organ cultures of endometrium were established with subsequent measurements of concentrations of prostaglandin E2 (PGE2), 6-keto-PGF1α and both leukotrienes (LTs), LTB4 and LTC4 in the culture supernatants...
July 29, 2017: Theriogenology
https://www.readbyqxmd.com/read/28796430/reproductive-careers-of-thoroughbred-broodmares-before-and-after-surgical-correction-of-%C3%A2-360-degree-large-colon-volvulus
#2
E R Leahy, S J Holcombe, E S Hackett, C F Scoggin, R M Embertson
BACKGROUND: Limited data exist describing broodmare longevity and reproductive efficiency after surgical correction of ≥360 degree large colon volvulus (° LCV). OBJECTIVES: Compare career duration and foals delivered for broodmares before and after ≥360° LCV surgery. STUDY DESIGN: Retrospective case series. METHODS: Broodmares registered with The Jockey Club that had surgical correction of ≥360° LCV and survived to hospital discharge at Rood and Riddle Equine Hospital from 1 January 2000 to 31 December 2015 were included...
August 10, 2017: Equine Veterinary Journal
https://www.readbyqxmd.com/read/28753494/ovarian-steroids-oxytocin-and-tumor-necrosis-factor-modulate-equine-oviduct-function
#3
P Pinto-Bravo, A Galvão, M R Rebordão, A Amaral, D Ramilo, E Silva, A Szóstek-Mioduchowska, G Alexandre-Pires, R Roberto da Costa, D J Skarzynski, G Ferreira-Dias
The oviduct plays important roles in the early reproductive process. The aim of this study was to evaluate gene transcription and protein expression of progesterone receptor (PGR), estrogen receptors 1 (ESR1) and 2 (ESR2); oxytocin receptor (OXTR); prostaglandin F2α synthase (AKR1C3), and prostaglandin E2 synthase (Ptges) in mare oviduct in different estrous cycle stages. Estradiol (E2), progesterone (P4), oxytocin (OXT), and tumor necrosis factor α (TNF) effect on in vitro PGE2 and prostaglandin F2α (PGF2α) secretion by equine oviduct explants or by oviductal epithelial cells (OECs) were also assessed...
June 24, 2017: Domestic Animal Endocrinology
https://www.readbyqxmd.com/read/28753433/effect-of-kisspeptin-10-lh-and-hcg-on-serum-testosterone-concentrations-in-stallions-donkeys-and-mules
#4
Rana Waseem Akhtar, Syed Aftab Hussain Shah, Irfan Zia Qureshi
This study was conducted to determine the response of serum testosterone (T) in male equines (stallions, donkeys and mules) after administering intravenous doses of kisspeptin-10 (KP-10), human chorionic gonadotropin (hCG) and luteinizing hormone (LH) and saline as a control. The animals were divided into four groups of three each: Group I, 3 ml of 0.95% saline; Group II, 50 μg KP-10; Group III, 2500 IU hCG and group IV, 400 μg LH. The administration of KP-10 and hCG to stallions resulted in a significant increase in serum T concentration at 240 min; whereas it was significantly higher at 30, 60, 120, and 240 min with LH treatment as compared to pre-dose concentrations...
July 21, 2017: Theriogenology
https://www.readbyqxmd.com/read/28741737/effect-of-exogenous-progesterone-administration-on-luteal-sensitivity-to-pgf-during-the-early-development-of-the-corpus-luteum-in-mares-and-cows
#5
A Garcia-Muñoz, X Valldecabres-Torres, J R Newcombe, J Cuervo-Arango, E Garcia-Rosello
The objective of this study was to determine the effect of exogenous progesterone administration at ovulation and during the early development of the CL, on its future sensitivity to a single administration of PGF2a in mares and cows. Horse Retrospective reproductive data from an equine clinic in the UK during three breeding seasons were used. Mares were divided into: control group, cycles with single ovulations; double ovulation group cycles with asynchronous double ovulations; and PRID group: cycles with single ovulations and treatment with intravaginal progesterone device (CIDR) immediately after the ovulation...
July 25, 2017: Reproduction in Domestic Animals, Zuchthygiene
https://www.readbyqxmd.com/read/28735601/impact-of-equine-assisted-reproductive-technologies-standard-embryo-transfer-or-intracytoplasmic-sperm-injection-icsi-with-in-vitro-culture-and-embryo-transfer-on-placenta-and-foal-morphometry-and-placental-gene-expression
#6
Orlando A Valenzuela, Anne Couturier-Tarrade, Young-Ho Choi, Marie-Christine Aubrière, Justin Ritthaler, Pascale Chavatte-Palmer, Katrin Hinrichs
Assisted reproductive technologies (ARTs) such as intracytoplasmic sperm injection (ICSI), in vitro embryo culture and embryo transfer (ET) may be associated with alterations in fetal and placental development. In horses, ET has been used for decades. More recently, in vitro embryo production by ICSI and in vitro culture, followed by embryo transfer (ICSI-C) has become an accepted method for clinical foal production. However, no information is available on the effects of ICSI-C or even of standard ET itself on placental and neonatal parameters in horses...
July 24, 2017: Reproduction, Fertility, and Development
https://www.readbyqxmd.com/read/28721542/molecular-characterization-modeling-in-silico-analysis-of-equine-pituitary-gonadotropin-alpha-subunit-and-docking-interaction-studies-with-ganirelix
#7
Anuradha Bhardwaj, Varij Nayan, Parvati Sharma, Sanjay Kumar, Yash Pal, Jitender Singh
Equine pituitary gonadotropins (eLH, eFSH, eCG) are heterodimeric glycoprotein hormones with alpha (α) and beta (β) subunits. It is responsible for maintenance of pregnancy in mares during early gestation and fairly valuable for inducing superovulation in animals other than equines. The alpha subunit is common, while beta subunit is species-specific in all glycoprotein hormones. In the present investigation, molecular cloning and in silico characterization including homology modeling and molecular docking analysis of the equine chorionic gonadotropin (eCG) alpha subunit was carried out for gaining structural and functional insights into the eCG alpha subunit and its possible interaction with ganirelix, a gonadotropin-releasing hormone (GnRH) antagonist...
December 2016: In Silico Pharmacology
https://www.readbyqxmd.com/read/28721123/aborted-fetal-sizes-of-thoroughbred-horses-in-hidaka-japan-between-2005-and-2015
#8
Harutaka Murase, Masaki Miyazawa, Takehiro Harada, Midori Ozawa, Fumio Sato, Tetsuro Hada
The degree of fetal growth restriction has been unclear in equine reproduction. In this study, 2,195 fetuses from 2,137 abortions during 11 seasons were examined to determine the causes of abortion, and fetal size dimensions (crown rump length and body weight) were measured. In total, 900 cases (42.1%) of abortion were identified as caused by viral infection (215, 10.1%), bacterial infection (156, 7.3%), fungal infection (25, 1.2%), circulation failure (406, 19.0%), multiple causes (66, 3.1%), deformity (13, 0...
2017: Journal of Equine Science
https://www.readbyqxmd.com/read/28651344/uterine-responses-to-early-pre-attachment-embryos-in-the-domestic-dog-and-comparisons-with-other-domestic-animal-species
#9
Felix R Graubner, Aykut Gram, Ewa Kautz, Stefan Bauersachs, Selim Aslan, Ali R Agaoglu, Alois Boos, Mariusz P Kowalewski
In the dog there is no luteolysis in the absence of pregnancy. Thus, this species lacks any anti-luteolytic endocrine signal as found in other species that modulate uterine function during the critical period of pregnancy establishment. Nevertheless, in the dog an embryo-maternal communication must occur in order to prevent rejection of embryos. Based on this hypothesis, we performed microarray analysis of canine uterine samples collected during pre-attachment phase (days 10-12) and in corresponding non-pregnant controls, in order to elucidate the embryo attachment signal...
June 23, 2017: Biology of Reproduction
https://www.readbyqxmd.com/read/28591825/corticotrophin-releasing-hormone-and-corticosterone-impair-development-of-preimplantation-embryos-by-inducing-oviductal-cell-apoptosis-via-activating-the-fas-system-an-in-vitro-study
#10
Xiu-Wen Tan, Chang-Li Ji, Liang-Liang Zheng, Jie Zhang, Hong-Jie Yuan, Shuai Gong, Jiang Zhu, Jing-He Tan
STUDY QUESTION: What are the mechanisms by which corticotrophin-releasing hormone (CRH) and corticosterone impair the development of preimplantation embryos in the oviduct. SUMMARY ANSWER: CRH and corticosterone do not affect preimplantation embryos directly, but impair their development indirectly by triggering apoptosis of oviductal epithelial cells (OECs) through activation of the Fas system. WHAT IS KNOWN ALREADY: Studies report that stress impairs embryo development with facilitated secretion of CRH and glucocorticoids...
June 7, 2017: Human Reproduction
https://www.readbyqxmd.com/read/28561264/virulence-markers-associated-with-trueperella-pyogenes-infections-in-livestock-and-companion-animals
#11
R M Risseti, E Zastempowska, M Twarużek, H Lassa, J C F Pantoja, A P C de Vargas, S T Guerra, C A D Bolaños, C L de Paula, A C Alves, B S Colhado, F V R Portilho, C Tasca, G H B Lara, M G Ribeiro
Trueperella pyogenes is an opportunistic pathogen that causes diverse pyogenic infections in livestock. The genes that encode the exotoxin pyolysin (plo) and other putative factors that promote adhesion of pathogen to host cells (fimbriae fimA, fimC, fimE, fimG, neuraminidases nanH, nanP, and collagen-binding protein cbpA) have been associated with virulence, particularly in mastitis and uterus infections of dairy cows. However, the role of these virulence markers in the pathogenicity of the agent in domestic animals infections still is incompletely understood...
May 31, 2017: Letters in Applied Microbiology
https://www.readbyqxmd.com/read/28559131/response-to-gonadotrophins-differs-for-gilts-from-female-and-male-biased-litters
#12
Jemma Seyfang, C R Ralph, A J Tilbrook, R N Kirkwood
In several species, females masculinised by abnormal androgen exposure in utero have poor reproductive performance and gilts born into litters with a male bias are likely exposed to greater androgen concentrations prenatally than gilts born into female-biased litters. At 24h of age, piglet plasma testosterone concentrations in gilts from male-biased litters (>60% male; n=22) or female-biased litters (>60% female; n=27) were not different. At 18 wks of age, all gilts received an injection of 400IU equine chorionic gonadotrophin plus 200IU human chorionic gonadotrophin to stimulate oestrus...
May 25, 2017: Animal Reproduction Science
https://www.readbyqxmd.com/read/28439783/dourine-a-neglected-disease-of-equids
#13
REVIEW
Yonas Gizaw, Mulisa Megersa, Teka Fayera
Dourine is a venereal transmitted trypanosomosis causing a major health problem threatening equines worldwide. The origin and identification of Trypanosoma equiperdum within the subgenus Trypanozoon is still a subject of debate. Unlike other trypanosomal infections, dourine is transmitted almost exclusively by coitus. Diagnosis of dourine has continued to be a challenge, due to limited knowledge about the parasite and host-parasite interaction following infection. The pathological lesions caused by the diseases are poorly described and are observed mainly in the reproductive organs, in the nervous system, and on the skin...
June 2017: Tropical Animal Health and Production
https://www.readbyqxmd.com/read/28424285/equine-arteritis-virus-has-specific-tropism-for-stromal-cells-and-cd8-t-and-cd21-b-lymphocytes-but-not-for-glandular-epithelium-at-the-primary-site-of-persistent-infection-in-the-stallion-reproductive-tract
#14
Mariano Carossino, Alan T Loynachan, Igor F Canisso, R Frank Cook, Juliana R Campos, Bora Nam, Yun Young Go, Edward L Squires, Mats H T Troedsson, Thomas Swerczek, Fabio Del Piero, Ernest Bailey, Peter J Timoney, Udeni B R Balasuriya
Equine arteritis virus (EAV) has a global impact on the equine industry as the causative agent of equine viral arteritis (EVA), a respiratory, systemic, and reproductive disease of equids. A distinctive feature of EAV infection is that it establishes long-term persistent infection in 10 to 70% of infected stallions (carriers). In these stallions, EAV is detectable only in the reproductive tract, and viral persistence occurs despite the presence of high serum neutralizing antibody titers. Carrier stallions constitute the natural reservoir of the virus as they continuously shed EAV in their semen...
July 1, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28407862/lipid-profiles-of-follicular-fluid-from-cows-submitted-to-ovarian-superstimulation
#15
P H Santos, P K Fontes, F F Franchi, M F G Nogueira, K R A Belaz, A Tata, M N Eberlin, M J Sudano, C M Barros, A C S Castilho
Ovarian superstimulation with exogenous gonadotropins has been extensively used to produce in vivo-derived embryos for embryo transfer in cattle. This process modifies the antral follicle microenvironment and affects oocyte and embryo quality as well the differentiation of granulosa cells. Lipids play significant roles in the cell, such as energy storage, cell structure, and fine-tuning of the physical properties and functions of biological membranes. The phospholipid (PL) contents as well as the effects of superstimulatory treatments on the PL profile of follicular fluid from cows, however, remain unknown...
May 2017: Theriogenology
https://www.readbyqxmd.com/read/28390723/manipulation-of-reproductive-seasonality-using-melatonin-implantation-in-anglo-nubian-does-treated-with-controlled-internal-drug-release-and-equine-chorionic-gonadotropin-during-the-nonbreeding-season
#16
M Y El-Mokadem, A N M Nour El-Din, T A Ramadan, A M A Rashad, T A Taha, M A Samak
The objective of this study was to compare the efficiency of hormonal treatments on ovarian activity and reproductive performance in anestrous Anglo-Nubian does during the nonbreeding season (February to May). A total of 48 multiparous does were divided into 2 groups (24 lactating does and 24 dry does). In each group, animals were allocated randomly into 2 equal subgroups (12 does each). In the first subgroup, does received a single 18-mg melatonin implant for 42 d followed by a controlled internal drug release (CIDR) device for 19 d in conjunction with 500 IU of equine chorionic gonadotropin (eCG) i...
April 5, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28284628/japanese-encephalitis-virus-infection-diagnosis-and-control-in-domestic-animals
#17
REVIEW
Karen L Mansfield, Luis M Hernández-Triana, Ashley C Banyard, Anthony R Fooks, Nicholas Johnson
Japanese encephalitis virus (JEV) is a significant cause of neurological disease in humans throughout Asia causing an estimated 70,000 human cases each year with approximately 10,000 fatalities. The virus contains a positive sense RNA genome within a host-derived membrane and is classified within the family Flaviviridae. Like many flaviviruses, it is transmitted by mosquitoes, particularly those of the genus Culex in a natural cycle involving birds and some livestock species. Spill-over into domestic animals results in a spectrum of disease ranging from asymptomatic infection in some species to acute neurological signs in others...
March 2017: Veterinary Microbiology
https://www.readbyqxmd.com/read/28246309/ovarian-fragment-sizes-affect-viability-and-morphology-of-preantral-follicles-during-storage-at-4%C3%A2%C2%BAc
#18
Gustavo Desire Antunes Gastal, Benner G Alves, Kele Amaral Alves, Maria Eduarda Magalhães Souza, Arnaldo Diniz Vieira, Antonio Sergio Varela Junior, José Ricardo Figueiredo, Jean Feugang, Thomaz Lucia Junior, Eduardo L Gastal
The method of transportation and the conditions imposed on the ovarian tissue are pivotal aspects for the success of ovarian tissue cryopreservation (OTC). The aim of this study was to evaluate the effect of the size of the ovarian tissue (e.g., whole ovary, biopsy size, and transplant size) during different times of storage (0, 6, 12, and 24 h) on the structural integrity of equine ovarian tissue transported at 4°C. Eighteen pairs of ovaries from young mares (<10 years old) were harvested in a slaughterhouse and processed to simulate the fragment sizes (biopsy and transplant size groups) or kept intact (whole ovary group), and stored at 4°C for up to 24 h in α-MEM enriched solution...
February 28, 2017: Reproduction: the Official Journal of the Society for the Study of Fertility
https://www.readbyqxmd.com/read/28224649/sex-chromosomal-abnormalities-associated-with-equine-infertility-validation-of-a-simple-molecular-screening-tool-in-the-purebred-spanish-horse
#19
G Anaya, A Molina, M Valera, M Moreno-Millán, P Azor, P Peral-García, S Demyda-Peyrás
Chromosomal abnormalities in the sex chromosome pair (ECAX and ECAY) are widely associated with reproductive problems in horses. However, a large proportion of these abnormalities remains undiagnosed due to the lack of an affordable diagnostic tool that allows for avoiding karyotyping tests. Hereby, we developed an STR (single-tandem-repeat)-based molecular method to determine the presence of the main sex chromosomal abnormalities in horses in a fast, cheap and reliable way. The frequency of five ECAX-linked (LEX026, LEX003, TKY38, TKY270 and UCDEQ502) and two ECAY-linked (EcaYH12 and SRY) markers was characterized in 261 Purebred Spanish Horses to determine the efficiency of the methodology developed to be used as a chromosomal diagnostic tool...
August 2017: Animal Genetics
https://www.readbyqxmd.com/read/28109010/lack-of-effects-of-an-equine-chorionic-gonadotropin-ecg-administration-between-days-9-and-15-postpartum-on-reproductive-performance-in-a-holstein-dairy-herd
#20
M Freick, O Passarge, J Weber
Recently, it has been demonstrated that administration of equine chorionic gonadotropin (eCG) in the postpartum period in dairy cows can enhance follicle growth, reduce the interval from calving to first ovulation and increase plasma estradiol concentrations, and, thus, could enhance reproductive performance in a dairy herd when administered on day 6 postpartum. The aim of this study was to investigate the effects of a single dose of eCG between days 9 and 15 postpartum on parameters of reproductive performance in dairy cows...
June 2017: Reproduction in Domestic Animals, Zuchthygiene
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