Veterinary Medicine Commons^™

Intracranial Mature Teratoma In A Pet Rabbit, Sara Degl'innocenti, Claudia Salvadori, Andrea Pirone, Carlo Cantile

The Thai Journal of Veterinary Medicine

A mature intracranial teratoma was identified in a 5-month-old pet rabbit showing a sudden onset of obtundation, recumbency, flaccid tetraplegia, and hyporeflexia. A space-occupying suprasellar, irregular cystic mass extending from the thalamus to the brainstem was observed at necropsy. Histologically, the tumor was composed of irregular, multilocular cysts lined by a thin wall and interposed tissue where a heterogeneous collection of structures including adipose and myxomatous tissues, cartilage, glandularand ductal structures, skeletal muscle, nervous tissue, nerve fascicles, sebaceous glands, and exocrine pancreatic cells were recognized. Immunohistochemistry showed labeling of the diverse tissues with cytokeratin, vimentin, smooth muscle actin, GFAP, NSE, …

Production Of Recombinant Chimeric Swine Pkr-Apaf-1 Protein And Its Apoptotic Inductionon Marc-145 Cells, Phong Vu Anh Tuan Vo, Thanaporn Leksakchai, Roongtham Kedkovid, Achara Tawatsin, Athipoo Nuntaprasert

The Thai Journal of Veterinary Medicine

No abstract provided.

Isolation And Identification Of Extended Spectrum Β-Lactamases (Esbls) Escherichia Colifrom Minced Camel Meat In Eastern Province, Saudi Arabia, Waleed Rizk El-Ghareeb, Sherief M. Abdel-Raheem, Theeb M. Al-Marri, Fanan A. Alaql, Mahmoud M. Fayez

The Thai Journal of Veterinary Medicine

Antimicrobial resistance is an increasingly serious threat to global public health that requires action across all government sectors and society. The aim of this study was to determine the rate of extended-spectrum β-lactamases (ESBL)-producing E. coliisolation from minced camel meat and identify the phenotype and genotype of the ESBL. A total of 150 samples were collected randomly from butchers’ shops in Al-Ahsa, Saudi Arabia. The results indicated that, overall, 17 (11.3 %) E. coliisolates were recovered from the minced meat samples. The isolates were classified biochemically at the species level using the VITEK 2 system. The antibiotic susceptibility of E. …

Prevalence Of Bacterial Contamination In Uncooked Sticky Rice Samples From Markets In Japan, Kazuko Kato, Noriko Komagome, Machiko Mineki, Sumalee Boonmar, Yukio Morita

The Thai Journal of Veterinary Medicine

We investigated the prevalence of bacterial contamination in uncooked sticky rice samples obtained from markets in Japan. Between June and August, 2019, a total of 25 sticky rice samples were purchased from shops in the Tokyo area. Twenty-two (88.0%) and 10 (40.0%) of 25 sticky rice samples harbored 3.06±0.54 log spc/g of standard plates counts and 2.17±0.23 log cfu/g of enterobacteriaceae bacteria counts, respectively. Three species of Enterobacteriaceae, Pantoea dispersa, P. ananati, and Kosakonia cowanii, were identified by MALDI-TOFMS-based test. Three (12.0%) of 25 sticky rice samples harbored 2.00 log cfu/g of Bacillusspecies. Bacillusspp. was not isolated after heat treatment …

Antimicrobial Activity Of Formulated Clove Essential Oil Spray Against Biofilm-Forming Malassezia Pachydermatisand Staphylococcus Pseudintermediusclinical Isolates, Jareerat Aiemsaard, Chuchat Kamollerd, Pimchanok Suwannathada, Eakachai Thongkham

The Thai Journal of Veterinary Medicine

Clove essential oil, Formulation preparation, Antimicrobial activity, Malassezia pachydermatis, Staphylococcus pseudintermedius

Testicular Gene Expression Of Anti-Müllerian Hormone, Androgen Receptor And Inhibin Alpha Subunit In Porcine Cryptorchidism, Gunnaporn Suriyaphol, Shanaporn Leelakajornkit, Wipa Sripodok, Wirakan Kallayanathum, Arunthip Komonpunporn, Nutthee Am-In, Sirinun Pisamai, Nathamon Yimpring

The Thai Journal of Veterinary Medicine

Cryptorchidism, one of the common congenital abnormalities in boars, results ina boar taint in the carcass and economic loss. However, knowledge of gene expression of hormones controlling the testicular descent process, such as anti-Müllerian hormone (AMH), androgen receptor (AR) and inhibin alpha subunit (INHA), in porcine testicular cryptorchidismis still limited. The present study aimed to investigate the gene expression profiles of AMH, ARand INHAin undescended testes (UDT) and descended testes (DT) in unilateral cryptorchid pigs of suckling (12 weeks of age), nursery (6weeks of age) and growing-finishing pigs (1520 weeksof age) and in normal testes (NT) at 12 weeks of …

Morphological Study Of The Lingual Papillae Of Jentink’S Flying Squirrel(Hylopetes Platyurus), Hevi Wihadmadyatami, Golda Rani Saragih, Geraldus Gunawan, Made Bagus Auriva Mataram, Ulayatul Kustiati, Dwi Liliek Kusindarta

The Thai Journal of Veterinary Medicine

This study describes the anatomy and histology of the tongue in the Jentink’s flying squirrel (Hylopetesplatyurus), a rodent native to Indonesia (Borneo and Sumatra). We examined the characteristics of the tongue using scanning electron microscopy (SEM) and light microscopy (LM). Macroscopic observations revealed three distinct regions: the apex, corpus (body) and radix (root). The dorsal surface of the apex was characterized by a median groove and lacked the lingual prominence that is common in many rodents. SEM and LM revealed the distribution of papillae over the dorsal surface of the tongue. The papillae could be categorized as mechanical papillae (filiform, …

Survival Time And Factors Influencing Survival Time In Cats With Arterial Thromboembolism In Thailand, Sirilak Disatian Surachetpong, Selapoom Pairor, Thanika Atiptamvaree, Tanawan Mangklabruks

The Thai Journal of Veterinary Medicine

This study aimed to report the survival time and to determine factors influencing survival time in cats with arterial thromboembolism (ATE) in Thailand. The medical records of 89 ATE cats presenting from January 2016 to December 2018 at four referral centers in Thailand were reviewed. The median survival time of ATE cats was 31 days (interquartile range 3-59 days). Cats with an age of at least 5 years (7 days; 95% confidence interval (CI) 0-25.961) had a shorter survival time than those with an age <5 years old (136 days; 95% CI 0-643.216) (p=0.021). Persian cats (450 days; 95% CI 0-37.552) had a longer survival time than other breed cats (15 days; 95% CI 0.799-7.201) (p=0.044). The multivariable Cox-regression analysis showed that a higher concentration of alanine aminotransferase (ALT) (p=0.002; Hazard ratios (HR)=1.002), circulating glucose (p=0.031; HR=1.005), and creatinine (p=0.011; HR=1.207) were associated with an increased risk of death. In conclusion, the survival time of cats with ATE in Thailand is reported. Age and breed influence the survival time of cats with ATE. The concentration of ALT, circulating glucose and creatinine is associated with an increased risk of death.

A Study Of Factors Associated With Arterial Thromboembolism In Cats Affected With Hypertrophic Cardiomyopathy In Thailand, Natthakritta Nokthong, Pornsawan Pongsawat, Phattareeporn Leurdthainarong, Sermsakul Sritrirasri, Sirilak Disatian Surachetpong

The Thai Journal of Veterinary Medicine

Feline arterial thromboembolism (ATE) is an acute condition that is usually associated with cardiomyopathy in cats. To date, there has been no report of factors associated with ATE in cats affected with hypertrophic cardiomyopathy (HCM) in Thailand. The purpose of this study was to find factors related to ATE in cats with HCM. A retrospective study was performed in 70 cats with HCM dividing them into two groups (26 ATE and 44 non-ATE groups) to analyze factors relating to ATE including sex, breed, age, weight, heart sounds, radiographic findings, echocardiographic findings and the environmental temperature. The result of univariable logistic …

Efficiency Of Heat Reduction In Barns During Rainy Season And Barn Characteristics: Their Relationship To Reproductive Performance Of Dairy Cows In A Tropical Environment, Watcharapong Choonkham, Thuwanon Boonkerd, Siriporn Kanwichai, Peter Vos, Witaya Suriyasathaporn

The Thai Journal of Veterinary Medicine

The objectives of this study were toevaluate the impact of efficiency of heat reduction on barns during the rainy season and barn characteristics on the reproductive performance of dairy cows in a tropical environment. Data of cows from 125 small-holder dairy farms in Chiang Mai, Thailand, during May to August 2014 was used. Reproductive performance indices, e.g. days to first insemination (DI) and days open (DO), were used as dependent variables. Microclimate factors included differences in temperature (TEMP_DIFF) and relative humidity (RH_DIFF) between the inside and outside of barns. From the total of 5,255 lactation data, 27 and 1,398 data …

Optimizing System For Sperm Quality Evaluation Using Crystalloid Diluent For Pigeons (Columba Livia Domestica), Thanida Sananmuang, Thitirat Singto, Kanyavee Intarak, Pimnipa Sanansin, Muttana Budsasom, Arrita Kongthip, Suwarak Wannaratana

The Thai Journal of Veterinary Medicine

Semen quality is a crucial factor for predicting fertility and hatchability in several avian species including pigeons. To evaluate pigeon semen quality, prior dilution of semen was required due to its small volume with highly concentrated spermatozoa. Conventional crystalloid solutions—Normal saline (NSS) and Ringer’s solution (LRS) are common diluents for such a task; however, the unoptimized dilution rate of such diluents was a major cause contributing to inaccurate semen quality evaluation. Due to the lack of such knowledge in pigeons this study aimed to optimize the dilution rate of Normal saline (NSS) and Ringer’s solution (LRS) for pigeon semen quality …

Sequence And Phylogenetic Analysis Of The Vp1 Segment Of Chicken Infectious Anemia Virus (Ciav) During An Outbreak In Palestine, Ibrahim Alzuheir, Nasr Jalboush, Adnan Fayyad, Mohammad Manassra

The Thai Journal of Veterinary Medicine

In this study, chicken infectious anemia virus (CIAV) was detected in two unvaccinatedcommercial broiler flocks, showing clinical signs relevant to Chicken infectious anemia (CIA) disease. The clinical signs included subcutaneous hemorrhage, depression and death. Necropsy findings were pale liver, severe atrophy of bursa of the Fabricius and thymus and discoloration of the bone marrow. DNA was extracted from the livers of the infected birds and the VP1 gene was detected by polymerase chain reaction. The virus strains were detected and genetically characterized in almost the whole VP 1 gene (1338 base pairs). The nucleic acid analysis showed that the two …

Prevalence Of Salmonellaspp. And Escherichia Coliin Dogs With Diarrhoea In Western Taiwan, Chiu-Huang Ting, Chia-Ying Lin, Chia-Wen Chung, Perng-Chih Shen, Ching-Dong Chang, Hung-Yi Wu

The Thai Journal of Veterinary Medicine

Salmonellaspp. can be widely spread by air or contaminated food. There are sixcommon pathogenic Escherichia coli whichaccount for 4–8% of all E. coli pathogens. Amongstthem, E. coliO157 is the most commonlyknown. In this study, we investigated the prevalence of diarrhoeapathogens, referred to as Salmonellaspp.andEscherichia coli(E. coli), in pet dogs in western Taiwan using the conventionalpolymerase chain reaction (PCR). The related analysis between the prevalence rates and the epidemiological data of pet dogs was correlated with age, season, area and breed. Faecalsamples were collected from240dogs which had symptoms of diarrhoeaand had been examined byveterinaryhospitals from January 2015 to January 2017. The …

Effectiveness Of Embalming Solutions With Partial Replacement Of Formaldehyde And Phenol With Ethanol And Sodium Chloride On Mice Over 18 Months, Kriengyot Sajjacharoenpong, Pawana Chuesiri

The Thai Journal of Veterinary Medicine

Animal preservation for anatomy teaching has been required to replace formaldehyde and phenolwhich represent a health hazard to humans. A comparative study of embalming solutions with partial replacement of formaldehyde and phenol with sodium chloride and ethanol was evaluated in mouse cadavers over an 18-month period. Twelve adult mouse carcasses were divided into six groups of two mice each. After openingthe mouse’s skin,the internal organswere removed and preserved with the remaining cadavers by freezing (Group I, control group) or in the respective embalming solution (Groups II to VI) and examined after 3, 6, 12 and 18 months. For the embalming …

Morphological Considerations Of The Reproductive Organs In Anestrus Gilts Affiliated With True Hermaphrodites In Thailand, Paisan Tienthai, Sawang Kesdangsakonwut, Padet Tummaruk

The Thai Journal of Veterinary Medicine

True hermaphrodites are animals with both male and female gonads that have concurrently developed in the same individual. The incidence of true hermaphroditism is moderately higher in pigs than in other domestic animals. The aim of this study was to describe the genital organs of gilts culled due to anestrus with true hermaphrodites by gross and histological analysis. Three anestrus gilts were categorized as unilateral true hermaphrodites, having one ovotestis and one ovary, while three other gilts were bilateral true hermaphrodites with two ovotestes. The anomalous structures of the female genital organs, such as oviductal aplasia and hyperclitoris were found …

Hyperdynamic Circulatory State In A Dog With Leptospirosis: A Case Report, Numfa Fungbun, Naruepon Kampa, Supranee Jitpean, Nitaya Boonbal

The Thai Journal of Veterinary Medicine

A hyperdynamic circulatory state is a common consequence of portal vein hypertension. Interestingly, this case report demonstrates acute canine leptospirosis manifesting with abdominal effusion, which it is focused ona hyperdynamic circulatory state, caused by portal hypertension. Severe acute kidney injury caused by leptospirosis in this case was hypothesized to be aggravated by renal hypoperfusion. This condition was noticed to occur in a similar way to hepatorenal syndrome (HRS) in humans. Briefly, a dog with leptospirosis manifesting with abdominal effusion which was diagnosed to be the consequence of hyperdynamic circulatory state caused by hepatopathy and severe acute kidney injury. Peritoneal dialysis …

Infection Of Subgroup J Avian Leukosis Induces Erythroblasts And Lymphoblasts In Chinese Local Breed Chickens, Jie Yang, Ziqiang Cheng, Chengui Li, Guihua Wang

The Thai Journal of Veterinary Medicine

Anaemia, emaciation, increased mortality and decreased egg production were observed in 21 birds in a Chinese local breed flock infected naturally at 240 days old. Macroscopically, the spleen and kidneys were enlarged. There were diffuse, multifocal white foci on the surface of the liver, lungs and ovaries. Histopathological examination demonstrated typical lymphosarcoma cells and erythroblasts in the lungs, spleen, liver, kidneys and ovaries. The results of polymerase chain reaction (PCR) showed that avian leukosis virus subgroup J(ALV-J) was positive in the liver, spleen and ovaries. Immunofluorescence assay results further confirmed the presence of ALV-J antigen in the liver, kidneys and …

Genetic Biocontrol For Invasive Species, John L. Teem, Luke Alphey, Sarah Descamps, Matt P. Edgington, Owain Edwards, Neil Gemmell, Tim Harvey-Samuel, Rachel L. Melnick, Kevin P. Oh, Antoinette J. Piaggio, J. Royden Saah, Dan Schill, Paul Thomas, Trevor Smith, Andrew Roberts

United States Department of Agriculture Wildlife Services: Staff Publications

Invasive species are increasingly affecting agriculture, food, fisheries, and forestry resources throughout the world. As a result of global trade, invasive species are often introduced into new environments where they become established and cause harm to human health, agriculture, and the environment. Prevention of new introductions is a high priority for addressing the harm caused by invasive species, but unfortunately efforts to prevent new introductions do not address the economic harm that is presently manifested where invasive species have already become established. Genetic biocontrol can be defined as the release of organisms with genetic methods designed to disrupt the reproduction …

Photographic Validation Of Target Versus Nontarget Take Of Brown Treesnake Baits, Shane R. Siers, Aaron B. Shiels, Cynthia G. Payne, Francinem M. Chlarson, Craig S. Clark, Stephen M. Mosher

United States Department of Agriculture Wildlife Services: Staff Publications

Use of toxic baits or other tools for managing nuisance species must ensure that the species of interest is adequately targeted while exposure to nontarget species is minimized. Nontarget takes of acetaminophen‐laced baits for control of invasive brown treesnakes (Boiga irregularis) on Guam may put those animals at risk of lethal intoxication and render the bait unavailable to the intended target species. We used wildlife cameras to identify species removing toxic and nontoxic baits from brown treesnake bait stations designed to exclude nontarget taxa in 2015 and 2016. Throughout various sites and habitat types, and balanced by season (wet vs. …

Time Allocation To Resources By Three Species Of Rats (Rattus Spp.) In A Radial Arm Maze, Gary Witmer, Nathan P. Snow, Rachael S. Moulton

United States Department of Agriculture Wildlife Services: Staff Publications

Context. Introduced rats (Rattus spp.) can pose a serious threat to native flora and fauna, especially on islands where most species have evolved in the absence of terrestrial predators. Effective detection and eradication methods for introduced rats are essential to the maintenance of insular ecosystem integrity. Thus, it is important to better understand the behaviour of rats when they first arrive in a new setting.

Aims. To determine whether rats would find some novel stimuli to be significantly more attractive than other novel stimuli.

Methods. An eight-arm radial maze was used to study the behaviour of three species of Rattus …

Interactions With Humans Shape Coyote Responses To Hazing, Julie K. Young, Edd Hammill, Stewart W. Breck

United States Department of Agriculture Wildlife Services: Staff Publications

Medium and large carnivores coexist with people in urban areas globally, occasionally resulting in

negative interactions that prompt questions about how to reduce human-wildlife conflict. Hazing,

i.e., scaring wildlife, is frequently promoted as an important non-lethal means for urbanites to reduce

conflict but there is limited scientific evidence for its efficacy. We used a population of captive coyotes (Canis latrans) to simulate urban human-coyote interactions and subsequent effects of hazing on coyote behavior. Past experiences with humans significantly affected the number of times a coyoteapproached a human to necessitate hazing. coyotes that had been hand fed by adults had to …

Hawaii As A Microcosm: Advancing The Science And Practice Of Managing Introduced And Invasive Species, Liba Pejchar, Christopher A. Lepczyk, Jean E. Fantle-Lepczyk, Steven C. Hess, M. Tracy Johnson, Christina R. Leopold, Michael Marchetti, Katherine M. Mcclure, Aaron B. Shiels

United States Department of Agriculture Wildlife Services: Staff Publications

Invasive species are a leading driver of global change, with consequences for biodiversity and society. Because of extraordinary rates of endemism, introduction, and extinction, Hawaii offers a rich platform for exploring the cross-disciplinary challenges of managing invasive species in a dynamic world. We highlight key successes and shortcomings to share lessons learned and inspire innovation and action in and beyond the archipelago. We then discuss thematic challenges and opportunities of broad relevance to invaded ecosystems and human communities. Important research needs and possible actions include eradicating mammals from mainland island sanctuaries, assessing hidden threats from poorly known introduced species, harnessing …

Deciphering Interactions Between White-Tailed Deer And Approaching Vehicle, Morgan Pfeiffer, Raymond B. Iglay, Thomas W. Seamans, Bradley F. Blackwell, Travis L. Devault

United States Department of Agriculture Wildlife Services: Staff Publications

Deer-vehicle collisions are a major transportation hazard, but factors affecting deer escape decision-making in response to vehicle approach remain poorly characterized. We made opportunistic observations of deer response to vehicle approach during daylight hours on a restricted- access facility in Ohio, USA (vehicle speeds were ≤64 km/h). We hypothesized that animal proximity to the road, group size, vehicle approach, and ambient conditions would affect perceived risk by white-tailed deer (Odocoileus virginianus) to vehicle approach, as measured by flight-initiation distance (FID). We constructed a priori models for FID, as well as road-crossing behavior. Deer responses were variable and did not demonstrate …

Evaluating Moose Alces Alces Population Response To Infestation Level Of Winter Ticks Dermacentor Albipictus, Daniel D. Ellingwood, Peter J. Pekins, Henry Jones, Anthony R. Musante

United States Department of Agriculture Wildlife Services: Staff Publications

Many wildlife populations are experiencing a variety of environmental pressures due to the direct and indirect consequences of a changing climate. In the northeast, USA, moose Alces alces are declining in large part because of the increasing parasitism by winter tick Dermacentor albipictus, facilitated by high host density and optimal environmental conditions. To test this hypothesis, and better understand the influence of this interaction on the stability of the regional population, we constructed a population viability model using data collected through comprehensive survival and productivity studies in 2002–2005 and 2014–2018 in northern New Hampshire. Years of heavy tick infestation (epizootics) …

Spillover Of Sars-Cov-2 Into Novel Wild Hosts In North America: A Conceptual Model For Perpetuation Of The Pathogen, Alan B. Franklin, Sarah N. Bevins

United States Department of Agriculture Wildlife Services: Staff Publications

There is evidence that the current outbreak of the novel coronavirus SARS-CoV-2, which causes COVID-19, is of animal origin. As with a number of zoonotic pathogens, there is a risk of spillover into novel hosts. Here, we propose a hypothesized conceptual model that illustrates the mechanism whereby the SARS-CoV-2 could spillover from infected humans to naive wildlife hosts in North America. This proposed model is premised on transmission of SARS-CoV-2 from human feces through municipal wastewater treatment plants into the natural aquatic environment where potential wildlife hosts become infected. We use the existing literature on human coronaviruses, including SARS CoV, …

The Comparative Cytotoxicity Of Riddelliine In Primary Mouse, Rat And Chick Hepatocytes, Bryan L. Stegelmeier, William S. Resager, Steven M. Colegate

Poisonous Plant Research (PPR)

Dehydropyrrolizidine alkaloid (DHPA) producing plants commonly poison livestock, wildlife and humans. Poisoning occurs when DHPAs are ingested as feed or food, or when they contaminate medicinal or herbal products. Direct toxicologic comparison of individual DHPAs is essential to estimate their actual health risks. This has been problematic due to varying models and difficulties in DHPA isolation or synthesis. In contrast, the macrocyclic DHPA riddelliine is readily isolated and it has been used as a benchmark to characterize different models of toxicity and carcinogenicity. Following earlier work with immortalized cell lines, the objective of this study was to characterize the effect …

Effect Of Ambient Temperature On Recovery Of Surgically Instrumented Sprague-Dawley Rats, Gianna Mangone

Senior Honors Projects, 2020-current

Based on current guidelines for housing rodents after surgical instrumentation, rodents may be housed at temperatures that hinder surgical recovery and cause thermal stress– room temperature (21°C) being one of them. Rodents are often housed at room temperature since this temperature is easy for humans to be caring for them. However, if recovering rodents are thermally stressed, experimental results will be confounded. To address this issue, Sprague-Dawley rats were surgically instrumented with radiotelemtry thermoprobes (Data Sciences, #TA-10F40) to monitor their core temperatures, then housed at one of five temperatures to assess the effect ambient temperature had on multiple aspects of …

Presence Of Dirofilaria Immitis In Mosquitoes In Southeastern Georgia, Angelica C. Tumminello

Honors College Theses

Canine heartworm disease is caused by the filarial nematode Dirofilaria immitis, which is transmitted by at least 25 known species of mosquito vectors. This study sought to understand which species of mosquitoes are present in Bulloch County, Georgia, and which species are transmitting canine heartworm disease. This study also investigated whether particular canine demographics correlated with a greater risk of heartworm disease. Surveillance of mosquitoes was conducted in known heartworm-positive canine locations using traditional gravid trapping and vacuum sampling. Mosquito samples were frozen until deemed inactive, then identified by species and sex. The mosquitoes were then either dissected under …

Public Perspectives And Media Reporting Of Wolf Reintroduction In Colorado, Rebecca Niemiec, Richard E.W. Berl, Mireille Gonzalez, Tara Teel, Cassiopeia Camara, Matthew Collins, Jonathan Salerno, Kevin Crooks, Courtney Schultz, Stewart Breck, Dana Hoag

United States Department of Agriculture Wildlife Services: Staff Publications

In the state of Colorado, a citizen ballot initiative to reintroduce gray wolves (Canis lupus) is eliciting polarization and conflict among multiple stakeholder and interest groups. Given this complex social landscape, we examined the social context surrounding wolf reintroduction in Colorado as of 2019. We used an online survey of 734 Coloradans representative in terms of age and gender, and we sampled from different regions across the state, to examine public beliefs and attitudes related to wolf reintroduction and various wolf management options. We also conducted a content analysis of media coverage on potential wolf reintroduction in 10 major daily …

The Efficacy Of Extended-Release Eprinomectin For The Reduction Of Horn Flies, Face Flies, And Fecal Egg Counts Of Parasitic Nematodes In Replacement Beef Heifers, Sophia F. Landers

Animal Science Undergraduate Honors Theses

The purpose of this study was to evaluate the efficacy of extended-release eprinomectin against horn flies, face flies, and fecal egg counts of parasitic nematodes in crossbreed replacement beef heifers. Fifty-four heifers were randomly placed into three treatment groups (N=18 heifers/treatment). Group 1 was administered the labeled dosage of extended-release eprinomectin on day 0. Group 2 acted as the negative control. Group 3 received the anthelmintic injection once a quarter of the heifers in the group reached the threshold treatment level for horn flies (N=200 flies/animal; day 41). Nematode infections were measured via fecal egg counts while horn and face …