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Equine Breeding

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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/28750625/developing-a-670k-genotyping-array-to-tag-2m-snps-across-24-horse-breeds
#4
Robert J Schaefer, Mikkel Schubert, Ernest Bailey, Danika L Bannasch, Eric Barrey, Gila Kahila Bar-Gal, Gottfried Brem, Samantha A Brooks, Ottmar Distl, Ruedi Fries, Carrie J Finno, Vinzenz Gerber, Bianca Haase, Vidhya Jagannathan, Ted Kalbfleisch, Tosso Leeb, Gabriella Lindgren, Maria Susana Lopes, Núria Mach, Artur da Câmara Machado, James N MacLeod, Annette McCoy, Julia Metzger, Cecilia Penedo, Sagi Polani, Stefan Rieder, Imke Tammen, Jens Tetens, Georg Thaller, Andrea Verini-Supplizi, Claire M Wade, Barbara Wallner, Ludovic Orlando, James R Mickelson, Molly E McCue
BACKGROUND: To date, genome-scale analyses in the domestic horse have been limited by suboptimal single nucleotide polymorphism (SNP) density and uneven genomic coverage of the current SNP genotyping arrays. The recent availability of whole genome sequences has created the opportunity to develop a next generation, high-density equine SNP array. RESULTS: Using whole genome sequence from 153 individuals representing 24 distinct breeds collated by the equine genomics community, we cataloged over 23 million de novo discovered genetic variants...
July 27, 2017: BMC Genomics
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/28707363/equine-peripheral-dental-caries-an-epidemiological-survey-assessing-the-prevalence-and-possible-risk-factors-in-western-australian-horses
#6
K Jackson, E Kelty, M Tennant
BACKGROUND: Peripheral dental caries is defined as macroscopic destruction of the calcified dental tissues and can be a cause of considerable dental pathology and pain. It appears to have a high prevalence within Western Australian horses and, at present, risk factors for the condition are poorly understood, making treatment and prevention difficult. OBJECTIVES: To assess the prevalence and potential risk factors involved in peripheral caries in horses in Western Australia...
July 14, 2017: Equine Veterinary Journal
https://www.readbyqxmd.com/read/28698690/equine-recurrent-uveitis-in-western-canadian-prairie-provinces-a-retrospective-study-2002-2015
#7
Lynne S Sandmeyer, Bianca S Bauer, Cindy Xin Feng, Bruce H Grahn
The objectives of this study were to determine the demographics of horses with equine recurrent uveitis (ERU) presenting to the Western College of Veterinary Medicine and to describe and compare the prognosis of ERU in the Appaloosa with that in other breeds. Horses diagnosed with ERU by a veterinary ophthalmologist between 2002 and 2015 were included. Eye lesions were classified as mild, moderate, or severe based on clinical manifestations. Breed, age, severity, blindness, and final outcome were evaluated...
July 2017: Canadian Veterinary Journal. la Revue Vétérinaire Canadienne
https://www.readbyqxmd.com/read/28697878/current-insights-into-the-molecular-genetic-basis-of-dwarfism-in-livestock
#8
REVIEW
Iris J M Boegheim, Peter A J Leegwater, Hein A van Lith, Willem Back
Impairment of bone growth at a young age leads to dwarfism in adulthood. Dwarfism can be categorised as either proportionate, an overall size reduction without changes in body proportions, or disproportionate, a size reduction in one or more limbs, with changes in body proportions. Many forms of dwarfism are inherited and result from structural disruptions or disrupted signalling pathways. Hormonal disruptions are evident in Brooksville miniature Brahman cattle and Z-linked dwarfism in chickens, caused by mutations in GH1 and GHR...
June 2017: Veterinary Journal
https://www.readbyqxmd.com/read/28695792/prediction-of-foal-carcass-composition-and-wholesale-cut-yields-by-using-video-image-analysis
#9
J M Lorenzo, C M Guedes, R Agregán, M V Sarriés, D Franco, S R Silva
This work represents the first contribution for the application of the video image analysis (VIA) technology in predicting lean meat and fat composition in the equine species. Images of left sides of the carcass (n=42) were captured from the dorsal, lateral and medial views using a high-resolution digital camera. A total of 41 measurements (angles, lengths, widths and areas) were obtained by VIA. The variation of percentage of lean meat obtained from the forequarter (FQ) and hindquarter (HQ) carcass ranged between 5...
July 11, 2017: Animal: An International Journal of Animal Bioscience
https://www.readbyqxmd.com/read/28691349/ovsynch-plus-protocol-improves-ovarian-response-in-anovular-murrah-buffaloes-in-low-breeding-season
#10
R K Sharma, S K Phulia, A Jerome, I Singh
The objective of the study was to evaluate the efficacy of ovarian response and pregnancy rate in anovular buffaloes following Ovsynch and Ovsynch Plus protocols. Buffaloes (n = 55) were divided into two groups: Ovsynch group (n = 26): GnRH (10 μg, GnRH1) on Day 0, PGF2 α (25 mg) on Day 7, GnRH (10 μg, GnRH2) on Day 9; Ovsynch Plus group (n = 29): 500 IU equine chorionic gonadotropin (eCG) 72 hr (day -3) prior to Ovsynch protocol, followed by fixed timed artificial insemination (FTAI) 6 and 24 hr after GnRH2 injection in bot groups...
July 9, 2017: Reproduction in Domestic Animals, Zuchthygiene
https://www.readbyqxmd.com/read/28627060/clinical-nutrition-counselling-service-in-the-veterinary-hospital-retrospective-analysis-of-equine-patients-and-nutritional-considerations
#11
D Vergnano, D Bergero, E Valle
Nutrition plays a very important role in the healthy and in the ill horse. Although research in this field clearly shows that incorrect nutritional practices may lead to severe pathologies, inappropriate feeding plans often continue to be used. A clinical nutrition counselling (CNC) service could thus be of great use to both horse owners and veterinarians. The aim of this study was to provide information on equine patients referred to the CNC service of the University of Turin and to provide standard dietary protocols as used in our Veterinary Teaching Hospital for the most common nutrition-related pathologies...
June 2017: Journal of Animal Physiology and Animal Nutrition
https://www.readbyqxmd.com/read/28608565/prevalence-of-headshaking-within-the-equine-population-in-the-united-kingdom
#12
S E Ross, V L H Roberts, J K Murray
BACKGROUND: Headshaking in horses has been reported to be most commonly due to idiopathic neuropathic facial pain (trigeminal-mediated headshaking). The prevalence of headshaking in horses in the UK is unknown. OBJECTIVES: To estimate owner-reported prevalence of headshaking in horses in the UK and to report their signalment and disease characteristics, as reported by owners. STUDY DESIGN: Cross-sectional web based owner questionnaire. METHODS: The questionnaire was advertised online via social media, horse forums, veterinary websites and equestrian magazines from 17 June 2016, until greater than 1,000 responses had been obtained...
June 13, 2017: Equine Veterinary Journal
https://www.readbyqxmd.com/read/28601147/deep-anestrous-mares-under-natural-photoperiod-treated-with-recombinant-equine-fsh-refsh-and-lh-relh-have-fertile-ovulations-and-become-pregnant
#13
Geraldine A Meyers-Brown, Meaghan C Loud, John C Hyland, Janet F Roser
The most common equine breeding practice to decrease the time to the first ovulation of the year is to use artificial lights starting December 1 in the Northern Hemisphere. It can take 60-90 d for this lighting regimen to induce a fertile ovulation. The success rate for pharmaceutical compounds to carry out the same process has been variable. One compound that did induce an early ovulation was recombinant equine follicle stimulating hormone (reFSH), but neither pregnancy nor cyclicity was established in that study...
August 2017: Theriogenology
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
#14
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/28568646/genetic-diversity-of-syrian-arabian-horses
#15
S Almarzook, M Reissmann, D Arends, G A Brockmann
Although Arabian horses have been bred in strains for centuries and pedigrees have been recorded in studbooks, to date, little is known about the genetic diversity within and between these strains. In this study, we tested if the three main strains of Syrian Arabian horses descend from three founders as suggested by the studbook. We examined 48 horses representing Saglawi (n = 18), Kahlawi (n = 16) and Hamdani (n = 14) strains using the Equine SNP70K BeadChip. For comparison, an additional 24 Arabian horses from the USA and three Przewalski's horses as an out group were added...
August 2017: Animal Genetics
https://www.readbyqxmd.com/read/28557367/septic-keratitis-in-dogs-cats-and-horses-in-switzerland-associated-bacteria-and-antibiotic-susceptibility
#16
Anja Suter, Katrin Voelter, Sonja Hartnack, Bernhard Martin Spiess, Simon Anton Pot
OBJECTIVE: To evaluate the most common bacterial pathogens associated with septic keratitis in veterinary patients from Switzerland. The second objective was to analyze antibiotic susceptibility test results of the identified bacterial pathogens. The third objective was to evaluate potential breed predispositions to septic keratitis. PROCEDURES: Two hundred and fifty-five cultures and antibiotic susceptibility reports from dogs, cats, and horses with septic keratitis that were presented to the University of Zurich Veterinary Medical Teaching Hospital between 2009 and 2013 were reviewed...
May 29, 2017: Veterinary Ophthalmology
https://www.readbyqxmd.com/read/28543943/assessment-of-horse-owners-ability-to-recognise-equine-laminitis-a-cross-sectional-study-of-93-veterinary-diagnosed-cases-in-great-britain
#17
D Pollard, C E Wylie, K L P Verheyen, J R Newton
BACKGROUND: Use of owner-reported data could further epidemiological knowledge of equine laminitis. However, owner recognition of laminitis has not previously been assessed. OBJECTIVES: The primary objective was to establish whether cases of owner-suspected laminitis would be confirmed as laminitis by the attending veterinary surgeon. Secondary objectives were to compare owner- and veterinary-reported information from veterinary-confirmed cases of equine laminitis...
May 22, 2017: Equine Veterinary Journal
https://www.readbyqxmd.com/read/28543410/the-diagnosis-of-equine-insulin-dysregulation
#18
REVIEW
F R Bertin, M A de Laat
Insulin dysregulation is the hallmark of equine metabolic syndrome and has received attention because of its direct association with laminitis. In the absence of an adequate treatment for laminitis, a focus on prophylaxis is needed, making early detection of individuals at risk of developing laminitis one of the main challenges in equine endocrinology. Recent studies have shown that insulin dysregulation goes beyond tissue insulin resistance and it is now demonstrated that the equine enteroinsular axis plays a major role in insulin secretion and equine hyperinsulinaemia...
May 22, 2017: Equine Veterinary Journal
https://www.readbyqxmd.com/read/28497743/seroprevalence-of-theileria-equi-and-babesia-caballi-in-horses-in-spain
#19
Maria Guadalupe Montes Cortés, José Luis Fernández-García, Miguel Ángel Habela Martínez-Estéllez
Equine piroplasmoses are enzootic parasitic diseases distributed worldwide with high incidence in tropical and subtropical regions. In Spain, there is insufficient epidemiological data about equine piroplasmoses. The main aim of the present study was therefore to estimate the prevalence of Theileria equi and Babesia caballi in five regions and obtain information about the risk factors. This study was conducted in the central and south-western regions of Spain, using indirect fluorescence antibody testing (IFAT) in 3,100 sera samples from apparently healthy horses of different ages, breeds, coat colours, genders and geographical locations...
2017: Parasite: Journal de la Société Française de Parasitologie
https://www.readbyqxmd.com/read/28460750/cross-sectional-study-of-the-prevalence-of-and-risk-factors-for-hoof-disorders-in-horses-in-the-netherlands
#20
M Holzhauer, R Bremer, I Santman-Berends, O Smink, I Janssens, W Back
Information is scarce on the prevalence of hoof disorders in horses. In this study, we examined the prevalence of and risk factors for hoof disorders in a population of horses in The Netherlands. In a group of 942 randomly selected horses, hoof health was scored during regular foot trimming (one horse/farm). Hooves were assessed for the occurrence of one of 12 hoof disorders by a group of 21 certified farriers in two periods i.e. winter and summer of 2015. The mean age of the group of horses was 11.2±5.6years...
May 1, 2017: Preventive Veterinary Medicine
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