GROWTH OF RANGE CATTLE PROTECTED FROM HORN FLIES (Haematobia irritans) BY EAR TAGS IMPREGNATED WITH FENVALERATE

1982 ◽  
Vol 62 (2) ◽  
pp. 567-573 ◽  
Author(s):  
W. O. HAUFE
Keyword(s):  
Key Words ◽  
Slow Release ◽  
Treated Group ◽  
Haematobia Irritans ◽  
Summer Range ◽  
Grazing Period ◽  
Growth Stimulant ◽  
Horn Flies ◽  
Host Parasite ◽  
The Impact

An experiment was conducted on a ranch to evaluate the efficacy of polyvinyl ear tags impregnated with fenvalerate to control horn flies and to improve growth of steers on range. An experimental tag, weighing 10.8 g and containing 7.2% fenvalerate by weight, was attached to each ear of yearling steers when they were moved to summer range in May. The tags were evaluated in combination with zeranol implanted as a growth stimulant during a 115-day grazing period. Release of fenvalerate from the tags kept a treated group of animals completely fly-free. At the end of the experiment, liveweight gain due to slow release of fenvalerate was increased by 18.5% for implanted and 17.7% for unimplanted animals. Increases due to zeranol implants were 7.1% for animals protected and 6.3% for those unprotected from horn flies. No statistical evidence was found for interaction between responses to the impregnated ear tags and growth stimulator implants in increasing the rate of gain in weight of the steers on pasture. The results of this experiment under ranching conditions corresponded closely with basic measurements on the impact of horn flies on productivity of cattle in a model for host-parasite regulation. Key words: Cattle, flies, ear tags, Haematobia irritans, fenvalerate

scholarly journals Influence of selective treatment on Haematobia irritans infestation of untreated cattle

2019 ◽  
Author(s):  
Cecilia Miraballes ◽  
Henrik Stryhn ◽  
Antonio Thadeu M. Barros ◽  
Martin Lucas ◽  
Luísa Nogueira Domingues ◽  
...  
Keyword(s):  
Treated Group ◽  
Control Group ◽  
Selective Treatment ◽  
Haematobia Irritans ◽  
Horn Fly ◽  
Before And After ◽  
Group 2 ◽  
Reducing Costs ◽  
Horn Flies ◽  
The Impact

AbstractTo reduce the use of insecticide treatments against Haematobia irritans we evaluated the impact of treating 15% of the bovines, with the greatest number of flies including bulls, with 40% diazinon ear tags, on the infestation of untreated cows. Horn fly susceptibility to diazinon was measured before and after treatment, and peaks of infestation were recorded. Three groups of Bradford bovines were evaluated: Group 1 (control untreated), Group 2 (15% treated) and Group 3 (control 100% treated). Weekly counts of horn flies were performed on the same animals for 78 days. Two peaks of infestation were recorded, and a higher number of horn flies occurred in the untreated control group than in the untreated cows of the selectively treated group throughout the entire period of the study, except for a single week. The horn fly field population was significantly more susceptible to diazinon than the reference susceptible strain both before and after insecticide treatment. In conclusion, treatment of 15% of the most infested animals from a herd, with 40% diazinon ear tags, quickly reduced horn fly infestations of the entire herd and may be a practical approach for horn fly control, reducing costs and chemical use.

PRODUCTIVITY OF THE COW-CALF UNIT IN RANGE CATTLE PROTECTED FROM HORN FLIES, Haematobia irritans (L.), BY PESTICIDAL EAR TAGS

1986 ◽  
Vol 66 (3) ◽  
pp. 575-589 ◽  
Author(s):  
W. O. HAUFE
Keyword(s):  
Response To Treatment ◽  
Economic Productivity ◽  
Haematobia Irritans ◽  
Southern Alberta ◽  
Grazing Period ◽  
Free Grazing ◽  
Cow Calf ◽  
Horn Flies ◽  
Fly Control ◽  
Summer Grazing

Experiments conducted on a ranch in southern Alberta evaluated the productivity of the cow-calf unit in breeding herds in response to treatment with pesticidal (8% fenvalerate wt/wt) ear tags to control infestations of horn flies, Haematobia irritans (L.). Optimum economic productivity was found to depend on the effectiveness of tags in establishing fly-free grazing (FFG) conditions and maintaining them without interruption during the complete summer grazing period. This was achieved when animals were tagged before the first overwintering horn flies emerged in spring. Present formulations of pesticide in tags will support the required FFG conditions for 85–90 d. Management of herds for maximum gains throughout the summer in southern Alberta requires fly control that will maintain FFG conditions for at least 115 d. Rates of gain in weight of animals under FFG conditions on dry range conformed with the 16% improvement in efficiency of production projected from controlled experiments on irrigated pastures. Key words: Cattle, cow-calf unit, flies, Haematobia irritans, ear tags, fenvalerate

scholarly journals Complete genome assembly of the Wolbachia endosymbiont of the horn fly Haematobia irritans irritans: a supergroup A strain with multiple horizontally acquired cytoplasmic incompatibility genes

2019 ◽  
Author(s):  
Mukund Madhav ◽  
Rhys Parry ◽  
Jess A.T. Morgan ◽  
Peter James ◽  
Sassan Asgari
Keyword(s):  
Cytoplasmic Incompatibility ◽  
Insect Pests ◽  
Whole Genome ◽  
Evolutionary Analysis ◽  
Wolbachia Pipientis ◽  
Haematobia Irritans ◽  
Horn Fly ◽  
Horn Flies ◽  
The Impact ◽  
Horizontal Acquisition

AbstractThe horn fly, Haematobia irritans irritans, is a hematophagous parasite of livestock distributed throughout Europe, Africa, Asia, and the Americas. Welfare losses on livestock due to horn fly infestation are estimated to cost between USD 1-2.5 billion annually in North America and Brazil. The endosymbiotic bacterium Wolbachia pipientis is a maternally inherited manipulator of reproductive biology in arthropods and naturally infects laboratory colonies of horn flies from Kerrville, USA and Alberta, Canada, but has also been identified in wild-caught samples from Canada, USA, Mexico and Hungary. Reassembly of PacBio long-read and Illumina genomic DNA libraries from the Kerrville H. i. irritans genome project allowed for a complete and circularised 1.3 Mb Wolbachia genome (wHae). Annotation of wHae yielded 1249 coding genes, 34 tRNAs, three rRNAs, and five prophage regions. Comparative genomics and whole genome Bayesian evolutionary analysis of wHae compared to published Wolbachia genomes suggests that wHae is most closely related to and diverged from Wolbachia supergroup A strains known to infect Drosophila spp. Whole-genome synteny analyses between wHae and closely related genomes indicates that wHae has undergone convoluted genome rearrangements while maintaining high nucleotide identity. Comparative analysis of the cytoplasmic incompatibility (CI) genes of wHae suggests two phylogenetically distinct CI loci and acquisition of another CifB homolog from phylogenetically distant supergroup A Wolbachia strains suggesting horizontal acquisition of these loci. The wHae genome provides a resource for future examination of the impact Wolbachia may have in both biocontrol and potential insecticide resistance of horn flies.ImportanceHorn flies, Haematobia irritans, are obligate hematophagous parasites of cattle having significant effects on production and animal welfare. Control of horn flies mainly relies on the use of insecticides, but issues with resistance have increased interest in development of alternative means of control. Wolbachia pipientis is an endosymbiont bacterium known to have a range of effects on host reproduction such as induction of cytoplasmic incompatibility, feminization, male killing, and also impacts on vector transmission. These characteristics of Wolbachia have been exploited in biological control approaches for a range of insect pests. Here we report the assembly and annotation of the circular genome of the Wolbachia strain of the Kerrickville, USA horn fly (wHae). Annotation of wHae suggests its unique features including the horizontal acquisition of additional transcriptionally active cytoplasmic incompatibility loci. This study will provide the foundation for future Wolbachia-induced biological effect studies for control of horn flies.

Narrative, Intertext and Allusion in the Qur'anic Presentation of Job

1999 ◽  
Vol 1 (1) ◽  
pp. 1-25 ◽  
Author(s):  
A. H. Johns
Keyword(s):  
Key Words ◽  
Complex Network ◽  
Key Words And Phrases ◽  
Divine Revelation ◽  
Western Tradition ◽  
Islamic Tradition ◽  
The Impact ◽  
The Way

Job (Ayyūb) is a byword for patience in the Islamic tradition, notwithstanding only six Qur'anic verses are devoted to him, four in Ṣād (vv.41-4), and two in al-Anbiyā' (vv.83-4), and he is mentioned on only two other occasions, in al-Ancām (v.84) and al-Nisā' (v.163). In relation to the space devoted to him, he could be accounted a ‘lesser’ prophet, nevertheless his significance in the Qur'an is unambiguous. The impact he makes is achieved in a number of ways. One is through the elaborate intertext transmitted from the Companions and Followers, and recorded in the exegetic tradition. Another is the way in which his role and charisma are highlighted by the prophets in whose company he is presented, and the shifting emphases of each of the sūras in which he appears. Yet another is the wider context created by these sūras in which key words and phrases actualize a complex network of echoes and resonances that elicit internal and transsūra associations focusing attention on him from various perspectives. The effectiveness of this presentation of him derives from the linguistic genius of the Qur'an which by this means triggers a vivid encounter with aspects of the rhythm of divine revelation no less direct than that of visual iconography in the Western Tradition.

Nickel oxide nanoparticles induce genotoxicity and cellular alterations in the ground beetle Blaps polycresta (Coleoptera: Tenebrionidae)

2021 ◽  
pp. 074823372110009
Author(s):  
Dalia Abdel Moneim Kheirallah ◽  
Awatef Mohamed Ali ◽  
Salah Eldein Osman ◽  
Amal Mohamed Shouman
Keyword(s):  
Nickel Oxide ◽  
Structural Changes ◽  
Ground Beetle ◽  
Biological Tissues ◽  
Treated Group ◽  
Sublethal Dose ◽  
Oxide Nanoparticles ◽  
Nickel Oxide Nanoparticles ◽  
Nio Nps ◽  
The Impact

Nickel nanoparticles (Ni-NPs) have advantageous applications in the industry; however, little is known of their adverse effects on biological tissues. In the present study, the ground beetle Blaps polycresta was employed as a sensitive indicator for nickel oxide nanoparticles (NiO-NPs) toxicity. Adult male beetles were injected with six dose levels of NiO-NPs (0.01, 0.02, 0.03, 0.04, 0.05, and 0.06 mg/g body weight). Mortality was reported daily over 30 days under laboratory conditions to establish an LD50. Nickel was detected in the testicular tissues of the beetles using X-ray analysis and transmission electronic microscopy. Beetles treated with the sublethal dose of 0.02 mg/g were selected to observe molecular, cellular, and subcellular changes. Gene transcripts of HSP70, HSP90, and MT1 were found to be increased >2.5-, 1.5-, and 2-fold, respectively, in the treated group compared with the controls. Decreased gene expression of AcPC01, AcPC02, and AcPC04 (≤1.5-, ≤2-, and < 2.5-fold, respectively, vs. controls) also were reported in the treated group. Under light microscopy, various structural changes were observed in the testicular tissues of the treated beetles. Ultrastructure observations using scanning and transmission electron microscopy showed severe damage to the subcellular organelles as well as deformities of the heads and flagella of the spermatozoa. Therefore, the present study postulated the impact of NiO-NPs in an ecological model.

Mandatory Reporting and Adolescent Sexual Assault

2021 ◽  
pp. 152483802110302
Author(s):  
Caroline Bailey ◽  
Jessica Shaw ◽  
Abril Harris
Keyword(s):  
Sexual Assault ◽  
Sexual Violence ◽  
Key Words ◽  
Scoping Review ◽  
Well Being ◽  
Mandatory Reporting ◽  
Age Group ◽  
Long Term Consequences ◽  
The Impact

Adolescents experience alarmingly high rates of sexual violence, higher than any other age-group. This is concerning as sexual violence can have detrimental effects on teens’ personal and relational well-being, causing long-term consequences for the survivor. Still, adolescents are hesitant to report the assault or seek out services and resources. When an adolescent survivor does seek out services, they may interact with a provider who is a mandatory reporter. This scoping review sought to synthesize the current U.S.-based research on the role, challenges, and impact of mandatory reporting (MR) in the context of adolescent sexual assault. Database searches using key words related to MR, sexual assault, and adolescence identified 29 peer-reviewed articles. However, none of these articles reported on empirical investigations of the phenomenon of interest and instead consisted of case studies, commentaries, and position papers. The scoping review was expanded to provide a lay of the land of what we know about the intersection of adolescent sexual assault and MR. Results of the review indicate that though implemented broadly, MR policies vary between individuals, organizations, and states and have historically been challenging to implement due to this variation, conflicts with other laws, tension between these policies and providers’ values, and other factors. Based on the available literature, the impact of MR in the context of adolescent sexual assault is unknown. There is a critical need for research and evaluation on the implementation and impact of MR policies, especially in the context of adolescents and sexual violence.

scholarly journals When is a Match Sufficient? A Score-based Balance Metric for the Synthetic Control Method

2020 ◽  
Vol 8 (1) ◽  
pp. 209-228
Author(s):  
Layla Parast ◽  
Priscillia Hunt ◽  
Beth Ann Griffin ◽  
David Powell
Keyword(s):  
Los Angeles ◽  
Control Method ◽  
Control Unit ◽  
Treated Group ◽  
Control Group ◽  
Synthetic Control ◽  
Donor Pool ◽  
Synthetic Control Method ◽  
The Mean ◽  
The Impact

AbstractIn some applications, researchers using the synthetic control method (SCM) to evaluate the effect of a policy may struggle to determine whether they have identified a “good match” between the control group and treated group. In this paper, we demonstrate the utility of the mean and maximum Absolute Standardized Mean Difference (ASMD) as a test of balance between a synthetic control unit and treated unit, and provide guidance on what constitutes a poor fit when using a synthetic control. We explore and compare other potential metrics using a simulation study. We provide an application of our proposed balance metric to the 2013 Los Angeles (LA) Firearm Study [9]. Using Uniform Crime Report data, we apply the SCM to obtain a counterfactual for the LA firearm-related crime rate based on a weighted combination of control units in a donor pool of cities. We use this counterfactual to estimate the effect of the LA Firearm Study intervention and explore the impact of changing the donor pool and pre-intervention duration period on resulting matches and estimated effects. We demonstrate how decision-making about the quality of a synthetic control can be improved by using ASMD. The mean and max ASMD clearly differentiate between poor matches and good matches. Researchers need better guidance on what is a meaningful imbalance between synthetic control and treated groups. In addition to the use of gap plots, the proposed balance metric can provide an objective way of determining fit.

scholarly journals Antifeedant Effects and Repellent Activity of Loline Alkaloids from Endophyte-Infected Tall Fescue against Horn Flies, Haematobia irritans (Diptera: Muscidae)

Molecules ◽  
2021 ◽  
Vol 26 (4) ◽  
pp. 817
Author(s):  
Javier Espinoza ◽  
Manuel Chacón-Fuentes ◽  
Andrés Quiroz ◽  
Leonardo Bardehle ◽  
Paul Escobar-Bahamondes ◽  
...  
Keyword(s):  
Tall Fescue ◽  
Preparative Thin Layer Chromatography ◽  
Repellent Activity ◽  
Choice Test ◽  
Haematobia Irritans ◽  
Major Pest ◽  
Horn Flies ◽  
Layer Chromatography ◽  
Hydrolysis Of ◽  
Spatial Repellency

Haematobia irritans is an obligate bloodsucking ectoparasite of cattle and is the global major pest of livestock production. Currently, H. irritans management is largely dependent upon broad-spectrum pesticides, which lately has led to the development of insecticide resistance. Thus, alternative control methods are necessary. Endophyte-infected grasses have been studied as an alternative due to their capability to biosynthesize alkaloids associated with anti-insect activities. Thus, the main aim of this study was to evaluate the antifeedant and repellent activity of lolines obtained from endophyte-infected tall fescue against H. irritans adults in laboratory conditions. The alkaloid extract (ALKE) was obtained by acid–base extraction. N-formyl loline (NFL) and N-acetyl loline (NAL) were isolated by preparative thin layer chromatography (pTLC) and column chromatography (CC), and the loline was prepared by acid hydrolysis of a NFL/NAL mixture. Loline identification was performed by gas chromatography coupled to mass spectrometry (GC/MS). Feeding behavior was evaluated by a non-choice test, and olfactory response was evaluated using a Y-tube olfactometer. Accordingly, all samples showed antifeedant activities. NFL was the most antifeedant compound at 0.5 µg/µL and 1.0 µg/µL, and it was statistically equal to NAL but different to loline; however, NAL was not statistically different to loline. NFL and NAL at 0.25 µg/µL were more active than loline. All samples except loline exhibited spatial repellency in the olfactometer. Thus, the little or non-adverse effects for cattle and beneficial activities of those lolines make them suitable candidates for horn fly management.

Reflections on Preliminary Fieldwork: The Militarisation of Public Space in Srinagar and its Impact on Rhythms of Everyday Life

2021 ◽  
Author(s):  
Arshita Nandan ◽  
Keyword(s):  
Everyday Life ◽  
Key Words ◽  
Public Space ◽  
Police Force ◽  
Self Determination ◽  
Indigenous Populations ◽  
Jammu And Kashmir ◽  
Current Form ◽  
The Military ◽  
The Impact

Abstract This project focuses on the conflict in Indian administered Jammu and Kashmir (J&K). This conflict is characterised by the militarised occupation of the region and resistance for self- determination by indigenous populations. In 2019, there were over 500,000 military and police force stationed in the state of J&K and over the years the forces have become a permanent fixture of the day-to-day life of people in the region. The use of civilian infrastructure by the military apparatus to control the rhythms of everyday life has evolved to its current form as an integral aspect of the conflict itself. This paper is focused on two interrelated aspects i.e., the impact of militarisation, magnified by Covid-19 pandemic on the fieldwork itself and its relationship to the larger impact of militarisation on everyday life in Srinagar. The methodology is inspired by rhythmanalysis which focuses on space of interaction. The rhythmanalysis is in two parts, it explores the rhythms as viewed and investigated by the researcher as opposed to the rhythms of everyday life for research participants. The aim here is to contextualise the questions of ethics and positionality as a researcher, conducting fieldwork during covid 19, in a militarised conflict region. Key Words: Military; Public Space; Rhythmanalysis; Resistance, Critical Architecture

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