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PCR assay detects Mannheimia haemolytica in culture-negative pneumonic lung tissues of bighorn sheep (Ovis canadensis) from outbreaks in the western USA, 2009-2010.

Mannheimia haemolytica consistently causes severe bronchopneumonia and rapid death of bighorn sheep (Ovis canadensis) under experimental conditions. However, Bibersteinia trehalosi and Pasteurella multocida have been isolated from pneumonic bighorn lung tissues more frequently than M. haemolytica by culture-based methods. We hypothesized that assays more sensitive than culture would detect M. haemolytica in pneumonic lung tissues more accurately. Therefore, our first objective was to develop a PCR assay specific for M. haemolytica and use it to determine if this organism was present in the pne…

Fasciola hepatica phenotypic characterization in Andean human endemic areas: valley versus altiplanic patterns analysed in liver flukes from sheep from Cajamarca and Mantaro, Peru.

Fascioliasis is a zoonotic parasitic disease caused by Fasciola hepatica and Fasciola gigantica. Of both species, F. hepatica is the only one described in the Americas, mainly transmitted by lymnaeid snail vectors of the Galba/Fossaria group. Human fascioliasis endemic areas are mainly located in high altitude areas of Andean countries. Given the necessity to characterize F. hepatica populations involved, the phenotypic features of fasciolid adults infecting sheep present in human fascioliasis endemic areas were analysed in the Cajamarca Valley and Mantaro Valley (valley transmission patterns)…

Extensive analysis of D-J-C arrangements allows the identification of different mechanisms enhancing the diversity in sheep T cell receptor beta-chain repertoire.

BACKGROUND: In most species of mammals, the TRB locus has the common feature of a library of TRBV genes positioned at the 5'- end of two in … also present. RESULTS: In this paper we focused our attention on the analysis of a large number of sheep TR beta-chain transcripts derived from four different lymphoid tissues of three diverse sheep breed animals to certify the use and frequency of the three gene clusters in the beta-chain repertoire. As the sheep TRB locus genomic organization is know …

Host responses during experimental infection with Fasciola gigantica or Fasciola hepatica in Merino sheep I. Comparative immunological and plasma biochemical changes during early infection.

This study reports the early biochemical changes in plasma, comparative host-immune responses and parasite recovery data in Merino sheep during the first 10 weeks of infection with Fasciola gigantica and Fasciola hepatica. One group of sheep were uninfected, four groups of sheep received incremental challenge doses of F. gigantica metacercariae (50, 125, 225 and 400, respectively) and the sixth group was challenged with 250 F. hepatica metacercariae. At 10 weeks post infection (wpi), sheep challenged with F. hepatica showed the greatest fluke recovery (mean 119, range 84-166); a significantly …

Maternal nutrient restriction during early to mid gestation alters the relationship between insulin-like growth factor I and bodyweight at term in fetal sheep.

The present study was designed to determine whether altered placental size, as a consequence of maternal nutrient restriction in sheep between 28 and 77 days gestation, is associated with a modified relationship between fetal weight or dimensions and plasma insulin-like growth factor (IGF) I concentration or abundance of hepatic IGF-I and IGF-II mRNA close to term. Singleton-bearing ewes consumed either 1.2x (controls, n = 19) or 0.5x (nutrient restricted, n = 28) their metabolizable energy (ME) requirements from 28 to 77 days gestation, after which all ewes were fed in order to fully meet the…

Atrial natriuretic peptide, cyclic GMP analogues and modulation of guanylyl cyclase do not alter stimulated POMC peptide release from perifused rat or sheep corticotrophs.

Corticotrophin-releasing hormone (CRH) and arginine vasopressin (AVP) are two potent stimulators for secretion of proopiomelanocortin (POMC) … ese results contrast with some previous studies and demonstrate that the cGMP signalling pathway in sheep or rat anterior pituitary cells does not directly inhibit secretion of POMC-derived hormones from corticotrophs.

Mechanism of liposoluble drugs and general anaesthetic's membrane action: action of difluorodichloromethane (FC 12) on different types of cardiac fibres isolated from sheep hearts.

The effect of difluorodichloromethane (FC 12), a chemically stable aerosol propellant which has long been considered innocuous, on several types of cardiac fibres isolated from sheep hearts after preparation in a nutritive solution was studied. Modifications in resistance and transmembrane potentials suggested a mechanism of FC 12 action. Physical constraint on membrane structures produced by high FC 12 concentrations from simple dissolution in the internal lipid layer explain modifications in cardiac membrane properties. Variable effects of FC 12 with localisation and time on automatism, exci…

Breed-Associated Differences in Longissimus Dorsi Muscle Lipid Composition in Saanen Dairy Goat, Shaanbei White Cashmere Goat, and Tan Sheep, with Implications for Flavour Formation.

Goat and sheep meat are highly regarded in the market for their unique flavor qualities. In this study, lipidomics technology was employed to compare the lipid differences in the longissimus dorsi muscle among 8-month-old Saanen dairy goats (DYG, n = 6), Shaanbei white cashmere goats (CAG, n = 6), and Tan sheep (TSH, n = 6). Electronic nose analysis was performed solely on the DYG samples, while the E-nose data for the CAG and TSH groups were referenced against previously published literature. The results indicated that aldehydes, ketones, methyl derivatives, and inorganic sulfides constituted…

Serological Investigation of Major Respiratory Viruses in Sheep in North Shewa, Ethiopia: Parainfluenza Virus, Bluetongue Virus, Maedi-Visna Virus and Peste des Petits Ruminants Virus.

BACKGROUND: Respiratory diseases significantly affect small ruminants, leading to considerable illness and mortality. These conditions are often multifactorial, resulting from interactions among pathogens, host immunity and environmental stressors. OBJECTIVE: This study aimed to detect antibodies against major respiratory viruses, bluetongue virus (BTV), Maedi-Visna virus (MVV), parainfluenza virus type 3 (PI-3) and Peste des petits ruminants virus (PPRV) in sheep from the North Shewa Zone, Ethiopia. METHODS: A cross-sectional serological survey was conducted between September and November 2…

Tissue tropism and mRNA expression profiles of selected innate immunity-related genes following experimental tick-borne encephalitis virus and louping ill virus infection of sheep.

UNLABELLED: Tick-borne encephalitis virus (TBEV) and louping ill virus (LIV) are genetically and antigenically closely related tick-borne flaviviruses responsible for different disease outcomes in sheep. In order to determine whether key components of the innate immunity could contribute to the observed difference in virus dissemination and disease outcome, 8-month-old sheep were inoculated intradermally with TBEV Neudoerfl strain or LIV LI/31 strain. Only LIV-infected sheep developed fever and clinical signs. No TBEV RNA was detected in serum and examined tissues, except for low amounts in th…

Short Supply of High Levels of Guanidine Acetic Acid, Alters Ovarian Artery Flow and Improves Intraovarian Blood Perfusion Area Associated with Follicular Growth in Sheep.

Guanidinoacetic acid (GAA), a precursor of creatine, has a recognized effect on ruminant performance when used as a dietary supplement. However, its impact on reproductive response remains to be elucidated. Therefore, this study aimed to contribute initially to this area by supplementing the diets of ewes with a high dose of GAA, evaluating its effects on reproductive response. Twenty adult sheep had their estrus synchronized using an MPA sponge, eCG, and PGF2α. After estrus detection ewes were mated. For 10 days until mating, ewes were grouped in groups of baseline diet (BSD; n = 10) and GAA …

Immunotoxicity of Four Per- and Polyfluoroalkyl Substances Following 28-Day Oral Repeat Dosing in Rats Assessed by the Anti-Sheep Red Blood Cell IgM Response.

Some PFASs are immunotoxic in rodent models and associated with diminished vaccine response in exposed humans. This study assessed the immunotoxicity of four PFASs via the T cell-dependent IgM antibody response (TDAR) to sheep red blood cells (SRBCs) in adult male rats following 28-day oral repeat dosing. The PFASs included 1H,1H,9H-perfluorononyl acrylate (PFNAC), 1H,1H,2H,2H-perfluorohexyl iodide (PFHI), 2-chlorotetrafluoropropionic acid (CTFPA), and 3,3,4,4,5,5,5-heptafluoropentan-2-one (MHFPK), administered in corn oil. The positive control was cyclophosphamide (CPS). Rats were dosed with …

Multi-scale habitat modeling framework for predicting the potential distribution of sheep gastrointestinal nematodes across Iran's three distinct climatic zones: a MaxEnt machine-learning algorithm.

Ecological niche models (ENMs) serve as valuable tools in assessing the potential species distribution, identifying crucial habitat components for species associations, and facilitating conservation efforts. The current study aimed to investigate the gastrointestinal nematodes (GINs) infection in sheep, predict and analyze their ecological niches and ranges, and identify the key bioclimatic variables influencing their distribution across three distinct climatic regions in Iran. In a cross-sectional study, a total of 2140 fecal samples were collected from semi-arid (n = 800), arid (n = 500), an…

Coexistence and genomics characterization of mcr-1 and extended-spectrum-β-lactamase-producing Escherichia coli, an emerging extensively drug-resistant bacteria from sheep in China.

The emergence of pathogens harboring multiple resistance genes poses a great threat to global public health. However, the coexistence of mobile resistance genes that provide resistance to both third-generation cephalosporins and colistin in sheep-origin Escherichia coli has not been previously investigated in China. This study is the first to characterize five E. coli isolates from sheep in Shaanxi province that harbor both Extended-Spectrum β-Lactamase (ESBL) and mcr-1 resistance genes. The isolates were identified and characterized by Illumina sequencing, nanopore sequencing, bioinformatic a…

Evaluation of Anti-Inflammatory and Immunosuppressant Potential of Isotelekin in Lipopolysaccharide (LPS) Stimulated Macrophage (RAW 264.7) and Sheep Red Blood Cells (SRBC) Sensitized Murine Models.

The present study explored the natural compound Isotelekin isolated from Inula racemose against anti-inflammatory and immunomodulatory potential in LPS-induced RAW264.7 cell lines and immune-elevated SRBC-sensitized animal models. Isotelekin in in vitro studies, inhibited the production of Th-1 cytokines Interleukin-6 (IL-6), Tumour necrosis factor (TNF-α), and Interferon-gamma (INF-γ), and increased Th-2 cytokines Interleukin-10 (IL-10). Whereas it inhibited the nitrites and reactive oxygen species (ROS) production by mitigating the effect of LPS significantly. In vivo immunomodulatory activi

A cross-sectional survey of farmer reported prevalence and farm management practices associated with neonatal infectious arthritis ("joint ill") in lambs, on UK sheep farms.

INTRODUCTION: Neonatal infectious arthritis (NIA) is a bacterial disease of lambs in the first month of life. NIA is associated with poor animal welfare, economic losses, and prophylactic antibiotic use. Farmers report problems with NIA despite following current guidance on prevention. The aim of this study was to estimate NIA UK incidence, describe current management practices for NIA control, and farm management risk factors associated with NIA. METHODS: A cross-sectional, online questionnaire of UK sheep farmers was carried out between June and October 2020. Descriptive statistics, and uni…

Отличительный ответ принимающей стороны, широкое распространение вирусов и долговременное распространение вирусной РНК у домашних овец, которые экспериментально заражены вирусом геморрагической лихорадки Крымско-Конго

Крымско-конголезская геморрагическая лихорадка ортонайрорус (CSFV) — патогенная группа риска 4, которая часто вызывает у человека сильную геморрагическую болезнь (CFV) с высоким коэффициентом смертности. Считается, что вирус сохраняется в экологическом цикле " клеща-вертебрата " , в котором участвуют многие дикие и домашние животные; однако биология инфекции CFV у этих животных по-прежнему плохо изучена. Здесь мы экспериментально заражаем домашних овец CSFV Kosovo Hoti, клинической изоляцией, представляющей высокую патогенность к людям и все шире используемой в текущих исследованиях.

Совпадение в аннотации оригинала
Crimean-Congo haemorrhagic fever orthonairovirus (CCHFV) is a tick-borne, risk group 4 pathogen that often causes a severe haemorrhagic dise … CCHFV infection in these animals remains poorly understood. Here, we experimentally infect domestic sheep with CCHFV Kosovo Hoti, a clinical isolate representing high pathogenicity to humans and increasingly utilized in current research. In the absence of prominent clinical signs, the infection leads to an acute viremia and coinciding viral shedding, fe …

Fasciola hepatica primoinfections and reinfections in sheep drive distinct Th1/Th2/Treg immune responses in liver and hepatic lymph node at early and late stages.

The expression of proinflammatory (IL-1β, IFN-γ, TNF-α) and regulatory (IL-10, TGF-β, IL-4) cytokines, as well as the transcription factor FoxP3, was quantified in the liver and hepatic lymph node (HLN) of sheep primoinfected and reinfected with Fasciola hepatica at early (4, 8 and 16 days post-infection [dpi]) and late (100 dpi) stages. The liver exerted a Th2 immune response at very early stages after the primoinfection with F. hepatica that induced the downregulation of IFN-γ, followed by a Th1/Th2/Treg response although the late stages were characterised by the expression of Th1/Th2 immune…

Sheep Milk Symbiotic Ice Cream: Effect of Inulin and Apple Fiber on the Survival of Five Probiotic Bacterial Strains during Simulated In Vitro Digestion Conditions.

We conducted a study to determine the survival of bacterial cells under in vitro digestion. For this purpose, ice cream mixes were prepared: … d from 6.11 to 8.88 log cfu g-1, ensuring a therapeutic effect. Studies have clearly indicated that sheep milk ice cream could provide a suitable matrix for the delivery of probiotics and prebiotics and contribute to intestinal homeostasis. The obtained results have an applicative character and may play an essential role in developing new functional she …

The effects of follicle stimulating hormone (FSH)-induced controlled ovarian hyperstimulation and nutrition on implantation-related gene expression in caruncular tissues of non-pregnant sheep.

Disturbances at the conceptus-maternal interface can have detrimental effects on pregnancy outcome. Additionally, changes in body condition … ed in uterine receptivity were investigated in the caruncles of control and FSH-superovulated ewes. Sheep were grouped according to their diet: control fed (CF), overfed (OF) or underfed (UF), and were either superovulated with FSH (SOV) or untreated (CON, naturally cycling) (n = 3-5/group). Caruncular samples for the assessment of the transcript levels …