Deer Research Articles

Comparison of Cortisol Levels in the Hair of Male European Roe Deer at the Beginning and End of the Stalking Hunting Season

Roe deer (Capreolus capreolus), as a representative of the Cervidae family, are particularly sensitive to negative environmental stimuli due to their need to maintain increased vigilance during feeding. Intensive hunting seasons are undoubtedly also a stressful factor for this species. The aim of this study was to analyze the cortisol levels in the hair of male roe deer collected at the beginning and the end of the hunting season in eastern Poland. In total, hair samples from 26 individuals collected in May and 31 individuals collected in September were analyzed. The concentration of cortisol in the hair was determined using the EIA kit. It was shown that the concentration of cortisol was significantly higher in samples collected in September compared to those collected in May (Pr. > |t| = 0.0017). Moreover, the age of animals and carcass mass did not significantly affect the concentration of the tested hormone. In summary, the concentration of cortisol in the fur of male roe deer depended on the season and was not influenced by the carcass mass or age of the animals studied.

Animal family discrimination from hair using ATR-FTIR and machine learning methods for applications in illegal wildlife trafficking.

Wildlife forensics plays a pivotal role in the combating illegal trafficking, supporting biodiversity conservation, and aiding in the identification of animals in wildlife. Animal hair, often found in trafficking crimes, serves as vital biological evidence that can provide significant information for animal identification. This study proposes a novel method integrating machine learning classifiers with Fourier transform infrared (FTIR) spectroscopy in attenuated total reflectance (ATR) mode to enhance the effectiveness of animal identification in wildlife forensic casework. Additionally, compound microscopy has also been utilized as a preliminary tool to perform morphological analysis of hair samples from four animal families, including Bovidae, Cervidae, Elephantidae, and Felidae. Further, chemical profiling through spectral data revealed significant overlapping peaks between family Bovidae and Cervidae. The classification experiment provides the random forest (RF) classifier as the most effective for family discrimination model. This research offers valuable insights for wildlife forensics by improving the identification accuracy of unknown hair samples, thus enhancing the overall effectiveness in forensic investigations.

Molecular detection of Setaria tundra (Issaitshikoff & Rajewskaya, 1928) and Setaria cervi (Rudolphi, 1819) in red deer in Slovakia

Filaroid nematodes Setaria tundra (Issaitshikoff & Rajewskaya, 1928) and Setaria cervi (Rudolphi, 1819) are internal parasites from family Onchocercidae with occurrence in the northern hemisphere. They have a considerably wide range of final host, including many species of family Cervidae. Intermediate hosts and vectors at the same time, are represented by the several mosquito species, mostly of genus Aedes. Infection of Setaria is relatively harmless and especially in wild cervids usually pass unnoticed. Although in some cases it can induce peritonitis which might be a life threatening condition.This study was determined to reveal the presence of helminths Setaria tundra and Setaria cervi in red deer (Cervus elaphus) in Slovakia. The parasites were identified morphologically and genetically, based on the sequences of a fragment of the mitochondrial cytochrome c oxidase subunit 1 (cox1) gene. For this purpose we used partial results of our longer parasitological monitoring realized in one particular hunting area located in eastern Slovakia, near the city of Košice. A total of 60 red deer individuals were tested, of which one was found to be infected with Setaria tundra (prevalence of 1.7%) and four were detected to be infected with Setaria cervi (prevalence 6.7%). The intensity of infection was very low, only one specimen of Setaria spp. in each positive animal.

Personalideer: A comprehensive review of personality studies in cervids

Understanding animal personality, that is, consistent behavioural variation among individuals, is essential for elucidating the evolutionary origins of human personality. Despite extensive research on personality in diverse taxa, its significance in deer (i.e. cervids, family Cervidae), a taxon with diverse socioecological strategies, remains largely unexplored. This review summarizes the deer personality literature and highlights the knowledge gap in the studied species, personality assessment methods and traits, the general goal of the study, and implications for human personality research. We identified 32 eligible studies on seven species of deer, representing only a small portion of existing deer taxonomic diversity. More than half of the articles focused on three common deer species, roe deer ( Capreolus capreolus), fallow der ( Dama dama), and elk ( Cervus canadensis). Most studies evaluated reactions to capture, handling, and approaching humans, interpreting these behaviours as ‘Boldness’ or a ‘Coping style’. Also, most articles investigated the personality links to ecological variables, followed by physiological measures, and management applications. We advise researchers to move beyond measuring single traits and adopt a multitrait–multimethod approach, as is common in human personality research. Finally, deer and other animal models might be viable alternatives for studying adaptive value and genetic and environmental underpinnings of personality when research on humans is complicated.

Use of the Phylobone database for the annotation of bone extracellular matrix proteins in reindeer (Rangifer tarandus).

Bone extracellular matrix (ECM) proteins play a key role in bone formation and regeneration, including structural and regulatory functions. The Phylobone database consists of 255 ECM protein groups from 39 species and can be used to support bone research. Here, we gathered bone ECM proteins from reindeer (Rangifer tarandus), a member of the Cervidae family. The importance of reindeer lies in their ability to regenerate their antlers, in both male and female individuals. Protein sequences were extracted from the National Center for Biotechnology Information's repository and selected by homology searches. We identified 215 proteins and their corresponding functional domains, which are putatively present in the bone ECM of reindeer. Protein sequence alignments have shown a high degree of conservation between R. tarandus and other members of the Cervidae family. This update expands the Phylobone database and shows that it is a useful resource for the preliminary annotation of bone ECM proteins in novel proteomes.

An individual-based model for direct and indirect transmission of chronic wasting disease in free-ranging white-tailed deer

Chronic wasting disease (CWD) is an infectious prion disease that infects members of the Cervidae family (i.e., deer) resulting in widespread ecological, economic, and recreational ramifications. We introduce a spatially explicit individual-based model (IBM) that integrates individual deer movement and behavior with population and disease dynamics to forecast CWD in populations of free-ranging white-tailed deer (Odocoileus virginianus). We use a Susceptible-Exposed-Infectious-Dead (S-E-I-D) epidemiological framework to explore spatiotemporal dynamics of CWD within an agriculturally dominated area in Michigan, USA. The IBM results closely mimicked documented short- and long-term dynamics of white-tailed deer populations and CWD in the Midwestern, USA. We applied pattern-oriented modeling using annual apparent CWD prevalence rates reported by Midwestern state wildlife agencies to validate the disease model. The introduction of a single infected deer to the modeled landscape (93 km2) led to an outbreak of CWD in 100 out of 350 model simulations (29 %); prevalence never exceeded 1.47 % for repetitions where the outbreak ended. For the 100 simulations where disease persisted, the deer population declined by 87 % by year 50 following initial introduction of CWD. Mean (±SD) prevalence after 5, 10, 25, and 50 years was 1.1 % (±1.0 %), 3.4 % (±3.3 %), 46.5 % (±18.8 %), and 51.8 % (±18.1 %), respectively, which highly correlated (r = 0.99) with annual CWD prevalence reported in Wisconsin white-tailed deer populations for years 1–21 post initial detection. Combined with a global sensitivity analysis, the IBM indicated that prevalence of CWD at year 20 was most sensitive to harvest rate of yearling and adult female deer and least sensitive to prion shedding rate, prion half-life, and deer group numbers, indicating that deer population parameters were more influential than disease parameters on CWD dynamics. Our IBM serves as a tool to explore and better understand indirect and direct transmission of CWD within free-ranging cervid populations. Users of this model can adjust parameter values to explore how interactions among individual deer and between deer and their environment affect CWD dynamics. This IBM also serves as a framework for applying and assessing spatially and temporally explicit management scenarios.

To vanlige digitaliseringsfloker

Når verden endrer seg gir det offentlige virksomheter både muligheter og utfordringer, men også endrede rammebetingelser. For holde seg relevant må de organisere seg slik at de er i takt med brukernes endrede behov og forventninger. Teamorganisering er den mest dynamiske organisasjonsformen vi kjenner. Mange norske virksomheter velger nettopp å bevege seg mot en teambasert organisering for å holde seg relevant for målgruppene og levere verdi. Denne overgangen er et hamskifte, ikke to graders kursendring som preges ofte av noen digitaliseringsfloker. Artikkelen presenterer to typiske floker: målsetting og lederens rolle og ansvar. Abstract in English In an ever-evolving world, public organizations are confronted with continuous shifts in their operating environment. This presents a spectrum of opportunities and challenges. To maintain relevance in this dynamic landscape, it is imperative that these organizations continuously focus on organizational form to meet the evolving needs and expectations of their users. To our knowledge, team organization is the most dynamic organizational form. Recently, aiming to stay relevant and capitalize on the benefits of digitalization has become a strategic choice for many organizations. This move towards team-based structure is not merely an adjustment but a fundamental transformation, essential for harnessing digitalization's full potential. This transition often encounters two "digitalization tangles”: goal setting, and the roles and responsibilities of leaders. Goals must be tailored to the team organization and cannot follow the traditional matrix organization structure. When goals are set along the axes of expertise and delivery, they create competing objectives, which makes it difficult for teams and individuals to prioritize in their daily work. Leadership in a team-based organization requires a paradigm shift. Leaders must pivot from traditional task-focused management to fostering value creation and team success. This necessitates a nuanced understanding and execution of leadership roles, balancing clear direction and goal setting with the autonomy of task execution. Some leaders struggle in this new context, veering towards either absenteeism or micromanagement, both of which hinder the efficacy of team organization. Successful public organizations that leverage the advantages of digitalization through team organization overcome these challenges. They establish clear, non-conflicting goals, and leaders play an active role in facilitating team success, embracing the evolution of their roles with a learning mindset and commitment. Our experience suggests that thriving in a team organization differs fundamentally from traditional matrix or domain-based forms of organizing. It requires a rethinking of fundamental business aspects, including goal setting and leadership roles.

Description of Bisbalus, a New Genus for the Gray Brocket, Mazama cita Osgood, 1912 (Mammalia, Cervidae), as a Step to Solve the Neotropical Deer Puzzle

The Neotropical deer genus Mazama is characterized by homoplastic morphological characters, a high karyotypic diversity, and a polyphyletic condition. The species of the genus have been recovered into two multigeneric lineages, the subtribes Odocoileina and Blastocerina, of the tribe Odocoileini (New World deer) in the family Cervidae. Within the Blastocerina, gray brockets include two non-sister species, Subulo gouazoubira, occurring south of the Amazon region, and Passalites nemorivagus, occurring in the Guianas and in the Amazon region. We clarify the taxonomic status and phylogenetic position of Mazama americana citus Osgood, 1912 (referred to as either S. gouazoubira or P. nemorivagus by other authors). We collected a topotype of M. a. citus from the eastern shore of Lake Maracaibo, Venezuela, characterize it morphologically and cytogenetically (conventional banding and fluorescence in situ hybridization), and carry out a phylogenetic analysis of its whole mitogenome and Cytb alongside two additional specimens of M. a. citus from northwestern Venezuela. Our analyses reveal the topotype to be a large gray brocket with a cinnamon band above the eyes and 2n = 61 and FN = 70 karyotype. Using cattle whole chromosome painting and bacterial artificial chromosome X probes, we determined its karyotype to differ in at least 10 rearrangements from that of S. gouazoubira. Bayesian inference recovers M. a. citus within the Blastocerina subtribe, separated phylogenetically from other gray brockets (100% branch value), revealing the Osgood’s gray brocket to be a valid species that should be assigned to a new genus. We propose the generic name Bisbalus, with Bisbalus citus (Osgood, 1912) as the type species.

Sperm storage of wild cervid species: comparison of available cryoprotectants

We compared four diluents (Andromed, dimethylacetamide, dimethyl sulphoxide, Triladyl) used for semen cryopreservation in wild ungulates from the family Cervidae, i.e. roe deer (Capreolus capreolus), red deer (Cervus elaphus), and fallow deer (Dama dama). Epididymal sperm samples were collected and analysed immediately using Computer Assisted Sperm Analysis with the module for concentration and motility determination and, after equilibration, frozen and placed in liquid nitrogen for one month. After thawing, the samples were again subjected to the same examination procedure. Influence of cryopreservation and choice of the cryoprotectant was assessed by monitoring sperm concentration, average head area (HA), average velocity and progressivity (VAP), beat frequency (BF), total motility (MO), total progressive motility (PR), circular tracks (CT) and mucous penetration (MP). We observed no significant differences in sperm concentration between cryoprotective diluents or fresh and post-thaw samples in all species. All motility indicators (MO, PR, VAP, BF, CT) were influenced by the treatment but did not differ significantly between diluents used in red and roe deer. In fallow deer, commercial diluents (Andromed, Triladyl) resulted in better sperm survival than the alternatives (dimethyl sulphoxide, dimethylacetamide). Only HA showed significant differences (P < 0.001) in all species based on the diluent, with no effect of treatment. In contrast, MP was influenced by both the diluent and the cryopreservation process in roe deer and, partly, fallow deer. In future studies, we suggest expanding both the members of the Cervidae family examined and the sample size. Knowledge how to optimise cryopreservation protocols for different mammalian species has implications for conservation reproductive medicine of endangered wildlife.

The internal carotid artery in the ontogenesis of selected representatives of the Cervidae family in Poland

In Poland, the environment occurs with the red deer, fallow deer, Eurasian elk and roe deer. Among the ruminants, changes occurring during ontogeny in the arterial system of the head, involving obliteration of the extracranial segment of the internal carotid artery. The aim of this study was to describe the presence and course of the internal carotid artery and indicate the timing of changes in the vascular system of the head associated with the process of obliteration of this vessel. The study was conducted on 146 representatives of the Cervidae family: red deer, fallow deer and roe deer This study showed the presence of a fully preserved internal carotid artery in fetuses and young animals up to the age of about two years. In animals of about 2.5 years of age, only the initial fragment of the internal carotid artery emerging from the carotid sinus and a short fragment directly through the rostral epidural rete mirabile were preserved. In adult animals older than three years the extracranial part of this artery was obliterated.

Surveillance of Vermont wildlife in 2021–2022 reveals no detected SARS-CoV-2 viral RNA

Previous studies have documented natural infections of SARS-CoV-2 in various domestic and wild animals. More recently, studies have been published noting the susceptibility of members of the Cervidae family, and infections in both wild and captive cervid populations. In this study, we investigated the presence of SARS-CoV-2 in mammalian wildlife within the state of Vermont. 739 nasal or throat samples were collected from wildlife throughout the state during the 2021 and 2022 harvest season. Data was collected from red and gray foxes (Vulpes vulples and Urocyon cineroargentus, respectively), fishers (Martes pennati), river otters (Lutra canadensis), coyotes (Canis lantrans), bobcats (Lynx rufus rufus), black bears (Ursus americanus), and white-tailed deer (Odocoileus virginianus). Samples were tested for the presence of SARS-CoV-2 via quantitative RT-qPCR using the CDC N1/N2 primer set and/or the WHO-E gene primer set. Surprisingly, we initially detected a number of N1 and/or N2 positive samples with high cycle threshold values, though after conducting environmental swabbing of the laboratory and verifying with a second independent primer set (WHO-E) and PCR without reverse transcriptase, we showed that these were false positives due to plasmid contamination from a construct expressing the N gene in the general laboratory environment. Our final results indicate that no sampled wildlife were positive for SARS-CoV-2 RNA, and highlight the importance of physically separate locations for the processing of samples for surveillance and experiments that require the use of plasmid DNA containing the target RNA sequence. These negative findings are surprising, given that most published North America studies have found SARS-CoV-2 within their deer populations. The absence of SARS-CoV-2 RNA in populations sampled here may provide insights in to the various environmental and anthropogenic factors that reduce spillover and spread in North American’s wildlife populations.

Comparative studies of X chromosomes in Cervidae family

The family Cervidae is the second most diverse in the infraorder Pecora and is characterized by variability in the diploid chromosome numbers among species. X chromosomes in Cervidae evolved through complex chromosomal rearrangements of conserved segments within the chromosome, changes in centromere position, heterochromatic variation, and X-autosomal translocations. The family Cervidae consists of two subfamilies: Cervinae and Capreolinae. Here we build a detailed X chromosome map with 29 cattle bacterial artificial chromosomes of representatives of both subfamilies: reindeer (Rangifer tarandus), gray brocket deer (Mazama gouazoubira), Chinese water deer (Hydropotes inermis) (Capreolinae); black muntjac (Muntiacus crinifrons), tufted deer (Elaphodus cephalophus), sika deer (Cervus nippon) and red deer (Cervus elaphus) (Cervinae). To track chromosomal rearrangements during Cervidae evolution, we summarized new data, and compared them with available X chromosomal maps and chromosome level assemblies of other species. We demonstrate the types of rearrangements that may have underlined the variability of Cervidae X chromosomes. We detected two types of cervine X chromosome—acrocentric and submetacentric. The acrocentric type is found in three independent deer lineages (subfamily Cervinae and in two Capreolinae tribes—Odocoileini and Capreolini). We show that chromosomal rearrangements on the X-chromosome in Cervidae occur at a higher frequency than in the entire Ruminantia lineage: the rate of rearrangements is 2 per 10 million years.

Analysis of the Intestinal and Faecal Bacterial Microbiota of the Cervidae Family Using 16S Next-Generation Sequencing: A Review.

The Cervidae family has a wide distribution due to its adaptation to numerous ecological environments, which allows it to develop a diverse microbial community in its digestive tract. Recently, research has focused on the taxonomic composition and functionality of the intestinal and faecal microbiota of different cervid species worldwide, as well as their microbial diversity and variation under different associated factors such as age, sex, diet, distribution, and seasonal variation. In addition, there is special interest in knowing how cervids act as reservoirs of zoonotic pathogenic microorganisms, which represent a threat to public health. This review provides a synthesis of the growing field of microbiota determination in cervids worldwide, focusing on intestinal and faecal samples using 16S next-generation sequencing. It also documents factors influencing microbial diversity and composition, the microorganisms reported as pathogenic/zoonotic, and the perspectives regarding the conservation of these species. Knowing the interactions between bacteria and cervid health can drive management and conservation strategies for these species and help develop an understanding of their evolutionary history and the interaction with emerging disease-causing microorganisms.

West Nile Virus and Epizootic Hemorrhagic Disease Virus Co-Infection in a Novel Host at the Nashville Zoo.

On August 30, 2017, one of five bontebok in a mixed-species exhibit at the Nashville Zoo at Grassmere exhibited acute hind-limb ataxia and altered demeanor. Pathological examination demonstrated meningoencephalitis and spinal myelitis. Coinfection of West Nile virus (WNV) and epizootic hemorrhagic disease virus (EHDV) was revealed by quantitative real-time and traditional reverse transcription-polymerase chain reaction assays and virus isolation/whole genome sequencing from brain tissue, respectively. Whole genome sequencing was conducted for EHDV. Mosquito testing from September 19 to October 13, 2017, demonstrated a higher WNV infection rate in mosquitoes at the zoo compared with the rest of Nashville-Davidson County. EHDV is endemic in wild white-tailed deer (family Cervidae) in Tennessee, and the prevalence in wildlife depends on environmental influences. This case illustrates the potential susceptibility of exotic zoo animals to endemic domestic arthropod-borne viruses (arboviruses) and reinforces the importance of cooperative antemortem and postmortem surveillance strategies among human, wildlife, and domestic animal health agencies.

Application of the Heuristic-Systematic Model to Chronic wasting Disease Risk perceptions

The heuristic-systematic model (HSM) suggests that when presented with a choice, individuals will use either heuristic or systematic processing modes to arrive at a judgment. In this paper, we evaluate the HSM model in the context of hunter perceptions toward chronic wasting disease (CWD), a neurological disease found in members of the family Cervidae that threatens the health of cervid populations and the flow of benefits humans derive from them. Data were obtained from surveys of hunters who harvested inside (N = 1500) and outside (N = 3500) of Disease Management Areas (DMAs) across the state of Minnesota with an overall response rate of ∼33%. Results suggested that self-efficacy and information sufficiency were associated with heuristic processing, while motivation was associated with systematic processing. Heuristic processing was associated with lower levels of perceived risk than systematic processing. Our results have implications for the communication efforts related to CWD management and engagement with the public.

Proposal of the colour pattern reconstruction of basal cervids

ABSTRACTMethodologies that analyse the colouration and external appearance of extant species are very useful tools when facing one of the greatest challenges in the palaeoartistic reconstructions of extinct fauna: inferring the colour patterns. Earlier works have applied this methodology, for example, in the reconstruction of the Miocene bovid Tethytragus, proving that the maximum likelihood (ML) analysis to infer ancestral states has promising potential. This study offers a proposal for the reconstruction of the external appearance of Heteroprox moralesi Azanza 1989, an early cervid of the Middle Miocene present in several fossil sites of Central Spain. For the reconstruction of the external appearance, the colour patterns of all the extant species of the family Cervidae were studied with the method of ML analysis, as well as recent works about their phylogeny. The results show the most probable basal colour pattern of the cervids: dark shades on the limbs, dorsal section, and head of the animal, and, in contrast, lighter colours on the neck and perianal region. This basal pattern can be used as a basis for reconstructing colouration and to hypothesise about the external appearance of extinct taxa. Furthermore, the inferred forest habitat of H. moralesi has been taken into consideration in order to adjust the colour pattern, comparing the final results of the analysis performed in this study with that of the pattern observed in extant forest deer as well as with previous works employing this methodology.

A review of viral and parasitic infections in wild deer in Australia with relevance to livestock and human health

Wild animals harbour a diverse range of pathogens. In Europe and North America, cervids (Family Cervidae) can act as reservoirs for viral, prion, bacterial, and parasitic infections. Wild deer often inhabit agricultural land, therefore representing a biosecurity risk due to their potential ability to transmit diseases to livestock. Multiple studies have investigated the infection status of wild deer in Australia, mostly during the 1970s and 1980s, and deer populations have increased greatly in abundance and distribution since then. Those studies provide an important baseline for the pathogens carried by wild deer in Australia but are limited by small sample size, the small number of deer species studied, and the disease detection methods used. Recent investigations using ELISA (Enzyme-Linked Immunosorbent Assay), PCR-based assays, and next-generation sequencing have substantially increased our understanding of viral and parasitic infections in Australian deer. These studies indicate that deer may act as reservoirs for pathogens such as Pestivirus, Neospora caninum and Entamoeba bovis. The use of next-generation sequencing has led to the discovery of novel viruses such as Picobirnavirus and a novel species of the genus Bopivirus, both of which pose transmission risks for domestic animals. Recent research confirms that wild deer could be a future source of viral and parasitic infections for domestic livestock and other wildlife species.

Sequencing and Characterization of the Complete Mitochondrial Genome of Tufted Deer, Elaphodus cephalophus (Artiodactyla: Cervidae) and its Phylogenetic Position within the Family Cervidae

Sequencing and Characterization of the Complete Mitochondrial Genome of Tufted Deer, Elaphodus cephalophus (Artiodactyla: Cervidae) and its Phylogenetic Position within the Family Cervidae

THE INFLUENCE OF VETERINARY AND ZOOTECHNICAL MEASURES ON THE CONTENT OF ESSENTIAL MICROELEMENTS AND THE QUALITY OF MEAT OF WILD DEER-LIKE IN THE WESTERN REGION OF UKRAINE

In the 20th century, representatives of the Cervidae family, in particular the red deer (Cervus elaphus) and fallow deer (Dama dama) became relatively popular "farm animals", they began to be bred on farms as semi-domestic animals. In Ukraine (especially in its western region) such opportunities are extremely large, which is due to the large areas of agricultural land, the use of which for agriculture and animal husbandry is impractical. Іn order preserve authenticity wild animals and to maximally improve the quality of the meat obtained from them, it is necessary to carry out veterinary and zootechnical measures in such a farm and they should be of with as little human disturbance as possible to reduce animal stress. The application of veterinary drugs specially developed for aviary complexes to red deer (n=18) and fallow deer (n=18) on the background of a corrected diet twice during three seasons (years) in conditions of semi-free housing did not affect on the organoleptic indicators and moisture content of the meat, but contributed to a more intense increase in its quality due to an increase in the mass fraction of protein by 13.8 and 10.8%, fat – by 7.4 and 15.5%, ash – by 19.1 and 44.2%, as well as enrichment with trace elements: the content of zinc increased by 23.9 and 38.6%, copper – by 6.6 and 13.2%, iron – by 6.4 and 1.9%, manganese – by 20.4 and 19.5%, cobalt – by 30.0 and 50.0%, selenium – by 11.8 and 11.3% respectively.

Mycoplasma ovipneumoniae: A Most Variable Pathogen.

Mycoplasma ovipneumoniae, a well-established respiratory pathogen of sheep and goats, has gained increased importance recently because of its detection in wild ruminants including members of the Cervidae family. Despite its frequent isolation from apparently healthy animals, it is responsible for outbreaks of severe respiratory disease which are often linked to infections with multiple heterologous strains. Furthermore, M. ovipneumoniae is characterized by an unusually wide host range, a high degree of phenotypic, biochemical, and genomic heterogeneity, and variable and limited growth in mycoplasma media. A number of mechanisms have been proposed for its pathogenicity, including the production of hydrogen peroxide, reactive oxygen species production, and toxins. It shows wide metabolic activity in vitro, being able to utilize substrates such as glucose, pyruvate, and isopropanol; these patterns can be used to differentiate strains. Treatment of infections in the field is complicated by large variations in the susceptibility of strains to antimicrobials, with many showing high minimum inhibitory concentrations. The lack of commercially available vaccines is probably due to the high cost of developing vaccines for diseases in small ruminants not presently seen as high priority. Multiple strains found in affected sheep and goats may also hamper the development of effective vaccines. This review summarizes the current knowledge and identifies gaps in research on M. ovipneumoniae, including its epidemiology in sheep and goats, pathology and clinical presentation, infection in wild ruminants, virulence factors, metabolism, comparative genomics, genotypic variability, phenotypic variability, evolutionary mechanisms, isolation and culture, detection and identification, antimicrobial susceptibility, variations in antimicrobial susceptibility profiles, vaccines, and control.