0
views
0
recommends
+1 Recommend
1 collections
    0
    shares
      • Record: found
      • Abstract: found
      • Article: found
      Is Open Access

      Factores ambientales asociados a la prevalencia de Haemonchus spp en corderos de la zona centro de Sinaloa Translated title: Environmental factors associated with the prevalence of Haemonchus spp in lambs from the central zone of Sinaloa

      research-article

      Read this article at

      Bookmark
          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          Abstract

          RESUMEN Los ovinos son una especie explotada en diferentes ámbitos de la producción. Estos son propensos a diferentes patógenos, destacando parásitos como Haemonchus contortus. El clima predominante y las prácticas de manejo en la crianza se consideran los principales factores que impulsan la distribución espacial y temporal del nematodo. Su distribución es mundial, ocasiona pérdidas económicas por morbilidad y mortalidad, se han reportado estudios de prevalencia en diferentes países como en India, España, Nigeria, México; por ello, el objetivo de este trabajo fue determinar los factores edafoclimáticos de las distintas zonas del municipio de Culiacán y sistema de producción que influyen en la prevalencia de Haemonchus spp en corderos. La investigación se realizó en el municipio de Culiacán, Sinaloa, México, en un periodo de un año, fue un estudio observacional, para el cual se incluyeron 23 unidades de producción ovina distribuidas en 10 sindicaturas del municipio, se realizó un muestreo por época del año colectando un total de 1520 muestras de heces procedentes de animales menores a 3 meses de edad. Las heces se procesaron individualmente por técnica de flotación. La prevalencia general fue de 13.42 %, y la época de otoño (OR 2.38 (1.69-3.34) P<0.001), zona de valle (OR 2.70 (1.21-6.02); P<0.016) y sistema extensivo (OR 4.81 (3.38-6.85); P<0.0001) resultaron factores de riesgo asociados a la presencia del nematodo en los corderos, por lo que deben considerarse para el establecimiento de medidas preventivas y de control de la parasitosis.

          Translated abstract

          ABSTRACT Sheep are a species exploited in different areas of production. They are prone to different pathogens, highlighting parasites such as Haemonchus contortus. The prevailing climate and husbandry management practices are considered the main factors driving the spatial and temporal distribution of the nematode. Its distribution is worldwide, causing economic losses due to morbidity and mortality, and prevalence studies have been reported in different countries such as India, Spain, Nigeria, and Mexico; therefore, the aim of this study was to determine the edaphoclimatic factors of different zones from Culiacan municipality and the production system that influence the prevalence of Haemonchus spp. in lambs. The research was carried out in Culiacan municipality, Sinaloa, Mexico, over a period of one year. It was an observational study, which included 23 sheep production units distributed in 10 districts of the municipality, with a total of 1520 samples of feces from animals under 3 months of age. Feces were processed individually by flotation technique. The overall prevalence was 13.42 %, and the autumn season (OR 2.38 (1.69-3.34) P<0.001), valley zone (OR 2.70 (1.21-6.02); P<0.016) and extensive system (OR 4.81 (3.38-6.85); P<0.0001) were risk factors associated with the presence of the nematode in lambs, so they should be considered for the establishment of preventive measures and control of parasitosis.

          Related collections

          Most cited references35

          • Record: found
          • Abstract: found
          • Article: not found

          Ecology of the free-living stages of major trichostrongylid parasites of sheep.

          Significant developments over recent decades make it timely to review the ecology of the major gastrointestinal nematode (GIN) species of sheep. These include the relentless development and spread of anthelmintic resistance in all of the major sheep production regions of the world, and the consequent drive towards integrated parasite management (IPM) systems incorporating non-chemotherapeutic strategies such as grazing management. The success of such programs is dependent on a detailed understanding of the environmental influences on the free-living stages of the nematode lifecycle. Major reviews of the subject were conducted prior to 1980, however considerable work has been completed since, including the development of mathematical models describing the epidemiology of GIN infection. Knowledge of the temperature thresholds for free-living development has also improved, while investigations of moisture influences and interactions with temperature have allowed more effective exploitation of environmental effects for IPM. This review re-evaluates our understanding of the factors that determine the success or failure of the free-living phases of the lifecycle in light of these developments. Temperature and moisture are the dominant influences on the free-living stages of Haemonchus contortus, Teladorsagia circumcincta and Trichostrongylus colubriformis, with the effects of pasture conditions playing a significant modulating role. Early in the free-living phase, the developmental success of the three GIN species is limited by susceptibility to cold temperatures. In general, H. contortus is most susceptible, followed by T. colubriformis and then T. circumcincta. The length of the development cycle is dependent largely on temperature, with development rate increasing at warmer temperatures. However, in order for development to proceed to the infective larval stage, addition of moisture is generally required. There has been considerably less work quantifying the effects of moisture on free-living development, although it is clear that H. contortus is most susceptible to desiccation during the pre-infective stages. Once the infective stage is reached, the influences of temperature and moisture on survival are less important, resulting in considerable survival times under conditions lethal to pre-infective stages. However, hot, dry conditions can be lethal for infective larvae of all three species, while extreme cold is also lethal with significant species variation. While the existing body of knowledge is substantial, the interpretation of many studies and comparison between them is complicated by inadequate description of, or variation in, the environmental measurements used. Confounding the effects of environmental variables on development to infective stage is the migration of larvae from the faeces and subsequent survival on pasture. There is a need to build on recent efforts to explore interaction between the effects of temperature and moisture, and also the trend to more closely simulate field conditions in laboratory studies. We propose a logical framework for future ecological investigations to overcome some of these problems, facilitate the development of a more integrated dataset on the subject and improve prediction of free-living development.
            Bookmark
            • Record: found
            • Abstract: found
            • Article: not found

            Calibration and diagnostic accuracy of simple flotation, McMaster and FLOTAC for parasite egg counts in sheep.

            The present study was aimed at carrying out a calibration and a comparison of diagnostic accuracy of three faecal egg counts (FEC) techniques, simple flotation, McMaster and FLOTAC, in order to find the best flotation solution (FS) for Dicrocoelium dendriticum, Moniezia expansa and gastrointestinal (GI) strongyle eggs, and to evaluate the influence of faecal preservation methods combined with FS on egg counts. Simple flotation failed to give satisfactory results with any samples. Overall, FLOTAC resulted in similar or higher eggs per gram of faeces (EPG) and lower coefficient of variation (CV) than McMaster. The "gold standard" for D. dendriticum was obtained with FLOTAC when using FS7 (EPG=219, CV=3.9%) and FS8 (EPG=226, CV=5.2%) on fresh faeces. The "gold standard" for M. expansa was obtained with FLOTAC, using FS3 (EPG=122, CV=4.1%) on fresh faeces. The "gold standard" for GI strongyles was obtained with FLOTAC when using FS5 (EPG=320, CV=4%) and FS2 (EPG=298, CV=5%). As regard to faecal preservation methods, formalin 5% and 10% or freezing showed performance similar to fresh faeces for eggs of D. dendriticum and M. expansa. However, these methods of preservation were not as successful with GI strongyle eggs. Vacuum packing with storage at +4°C permitted storage of GI strongyle eggs for up to 21 days prior to counting. Where accurate egg counts are required in ovine samples the optimum method of counting is the use of FLOTAC. In addition, we suggest the use of two solutions that are easy and cheap to purchase and prepare, saturated sodium chloride (FS2) for nematoda and cestoda eggs and saturated zinc sulphate (FS7) for trematoda eggs and nematoda larvae. Copyright © 2010 Elsevier B.V. All rights reserved.
              Bookmark
              • Record: found
              • Abstract: found
              • Article: not found

              Epidemiology of gastrointestinal nematodes of sheep managed under traditional husbandry system in Kashmir valley.

              The present study was conducted with the objective to investigate the seasonal epidemiological prevalence of gastrointestinal tract (GIT) nematodes in different age groups, sexes and breeds (genotypes) of sheep through necropsy and faecal analysis over a period of 2 years in Kashmir valley, India. A total of 1533 sheep were examined [faecal examination: 1035 (year 1: 561, year 2: 474); necropsy: 498 (year 1: 232, year 2: 266)]. Out of these, 945 (61.64%) were found infected [faecal examination: 697 (67.34%, year 1: 390 (69.51%), year 2: 307 (46.99%); necropsy: 248 (49.79%, year 1: 123 (53.01%), year 2: 125 (64.69%)] with GIT nematodes. The over all prevalence of GIT nematodes in sheep in year 1 was 64.76 and 58.37% in year 2 (P=0.04). The parasites in decreasing order of prevalence (%) in sheep were Haemonchus contortus (59.6); Ostertagia circumcincta (38.0); Bunostomum trigonocephalum (37.7); Chabertia ovina (37.7); Trichostrongylus spp. (33.9); Nematodirus spathiger (29.4); Oesophagostomum columbianum (28.4); Trichuris ovis (23.5) and Marshallagia marshalli (22.1). Season, sex, age, and genotype were the factors that influenced the epidemiological prevalence of GIT nematodes in sheep in the present study. The maximum nematode infection was observed in summer season and lowest in winter (P=0.0005). Local Kashmiri breed was less infected as compared to other genotypes (P>0.05). Lower age groups were more infected than adult animals (P>/=0.05). Prevalence was higher in rams (males) than eves (females) (P>0.05). The present study will initially be of great significance to add to the existing knowledge of the epidemiology of GIT nematodes of small ruminants and the findings will be quite helpful to devise the appropriate control and prophylactic strategies for GIT nematodiasis of sheep reared under the temperate agro-climatic conditions.
                Bookmark

                Author and article information

                Journal
                av
                Abanico veterinario
                Abanico vet
                Sergio Martínez González (Tepic, Nayarit, Mexico )
                2007-428X
                2448-6132
                December 2021
                : 11
                : e128
                Affiliations
                [2] orgnameUniversidad Autónoma de Baja California orgdiv1Instituto de Investigaciones en Ciencias Veterinarias Mexico
                [1] orgnameUniversidad Autónoma de Sinaloa orgdiv1Facultad de Medicina Veterinaria y Zootecnia Mexico
                Article
                S2448-61322021000100128 S2448-6132(21)01100000128
                10.21929/abavet2021.41
                da0ea0e0-a349-4cb0-beaa-49db766ff84b

                This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

                History
                : 26 July 2021
                : 08 November 2021
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 36, Pages: 0
                Product

                SciELO Mexico

                Categories
                Artículos originales

                gastrointestinal nematode,Haemonchus,prevalencia,ovinos,factor de riesgo,nematodo gastrointestinal,prevalence,sheep,risk factor

                Comments

                Comment on this article