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Boughton CJ, Lancaster LT, Morgan ER. Biotic interactions in soil and dung shape parasite transmission in temperate ruminant systems: An integrative framework. ECOLOGICAL APPLICATIONS : A PUBLICATION OF THE ECOLOGICAL SOCIETY OF AMERICA 2024; 34:e2956. [PMID: 38426805 DOI: 10.1002/eap.2956] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2023] [Revised: 09/01/2023] [Accepted: 12/07/2023] [Indexed: 03/02/2024]
Abstract
Gastrointestinal helminth parasites undergo part of their life cycle outside their host, such that developmental stages interact with the soil and dung fauna. These interactions are capable of affecting parasite transmission on pastures yet are generally ignored in current models, empirical studies and practical management. Dominant methods of parasite control, which rely on anthelmintic medications for livestock, are becoming increasingly ineffective due to the emergence of drug-resistant parasite populations. Furthermore, consumer and regulatory pressure on decreased chemical use in agriculture and the consequential disruption of biological processes in the dung through nontarget effects exacerbates issues with anthelmintic reliance. This presents a need for the application and enhancement of nature-based solutions and biocontrol methods. However, successfully harnessing these options relies on advanced understanding of the ecological system and interacting effects among biotic factors and with immature parasite stages. Here, we develop a framework linking three key groups of dung and soil fauna-fungi, earthworms, and dung beetles-with each other and developmental stages of helminths parasitic in farmed cattle, sheep, and goats in temperate grazing systems. We populate this framework from existing published studies and highlight the interplay between faunal groups and documented ecological outcomes. Of 1756 papers addressing abiotic drivers of populations of these organisms and helminth parasites, only 112 considered interactions between taxa and 36 presented data on interactions between more than two taxonomic groups. Results suggest that fungi reduce parasite abundance and earthworms may enhance fungal communities, while competition between dung taxa may reduce their individual effect on parasite transmission. Dung beetles were found to impact fungal populations and parasite transmission variably, possibly tied to the prevailing climate within a specific ecological context. By exploring combinations of biotic factors, we consider how interactions between species may be fundamental to the ecological consequences of biocontrol strategies and nontarget impacts of anthelmintics on dung and soil fauna and how pasture management alterations to promote invertebrates might help limit parasite transmission. With further development and parameterization the framework could be applied quantitatively to guide, prioritize, and interpret hypothesis-driven experiments and integrate biotic factors into established models of parasite transmission dynamics.
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Affiliation(s)
| | | | - Eric R Morgan
- School of Biological Sciences, Queen's University Belfast, Belfast, UK
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Moerman TM, Albon SD, Coulson SJ, Loe LE. Climate change effects on terrestrial parasitic nematodes: Where are the knowledge gaps? J Helminthol 2023; 97:e94. [PMID: 38047417 DOI: 10.1017/s0022149x23000652] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2023]
Abstract
Climate change is expected to affect parasitic nematodes and hence possibly parasite-host dynamics and may have far-reaching consequences for animal health, livestock production, and ecosystem functioning. However, there has been no recent overview of current knowledge to identify how studies could contribute to a better understanding of terrestrial parasitic nematodes under changing climates. Here we screened almost 1,400 papers to review 57 experimental studies on the effects of temperature and moisture on hatching, development, survival, and behaviour of the free-living stages of terrestrial parasitic nematodes with a direct life cycle in birds and terrestrial mammals. Two major knowledge gaps are apparent. First, research should study the temperature dependency curves for hatching, development, and survival under various moisture treatments to test the interactive effect of temperature and moisture. Second, we specifically advocate for more studies that investigate how temperature, and its interaction with moisture, affect both vertical and horizontal movement of parasitic nematodes to understand infection risks. Overall, we advocate for more field experiments that test environmental effects on life-history traits and behaviour of parasitic nematodes in their free-living stages under natural and realistic circumstances. We also encourage studies to expand the range of used hosts and parasitic nematodes because 66% of results described in the available studies use sheep and cattle as hosts and 32% involve just three nematode species. This new comprehension brings attention to understudied abiotic impacts on terrestrial parasitic nematodes and will have broader implications for livestock management, wildlife conservation, and ecosystem functioning in a rapidly warming climate.
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Affiliation(s)
- T M Moerman
- Faculty of Environmental Sciences and Natural Resource Management, Norwegian University of Life Sciences, NO-1432 Ås, Norway
- The University Centre in Svalbard, P.O. Box 156, NO-9171 Longyearbyen, Norway
| | - S D Albon
- The James Hutton Institute, Craigiebuckler, AberdeenAB15 8QH, Scotland
| | - S J Coulson
- The University Centre in Svalbard, P.O. Box 156, NO-9171 Longyearbyen, Norway
| | - L E Loe
- Faculty of Environmental Sciences and Natural Resource Management, Norwegian University of Life Sciences, NO-1432 Ås, Norway
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Meneses AJG, Pompeu RCFF, Salles HO, da Silva Vieira L, Teixeira M, Rogério MCP, Sousa AMP, Pereira PL, Cândido MJD. Castor bean cake for the control of parasites in pasture-finished sheep. Trop Anim Health Prod 2022; 54:300. [PMID: 36107263 PMCID: PMC9476406 DOI: 10.1007/s11250-022-03273-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2022] [Accepted: 08/31/2022] [Indexed: 12/02/2022]
Abstract
The purpose of this study was to evaluate castor bean cake as alternative input in the control of gastrointestinal parasites in sheep raised on irrigated pasture under continuous stocking. The treatments consisted of sheep supplemented with standard diet and pasture fertilized with urea; sheep supplemented with alternative diet and pasture fertilized with urea; sheep supplemented with standard diet and pasture fertilized with in natura castor bean cake; and sheep supplemented with alternative diet and pasture fertilized with in natura castor bean cake. A randomized complete block design (CBD) was used, with 16 replications (sheep), with repeated measures over time, the plots being the treatments, and the subplots the collection times. Infective nematode larvae in the pasture (L3.g DM−1), number of eggs per gram of feces (EPG), globular volume (GV), and total plasma protein (TPP) were evaluated. For adult gastrointestinal parasite counts, CBD was also used with six replications. Except for FAMACHA© grade, all variables had effect (P < 0.01) of the time factor. The average number of L3.g DM−1 and EPG were 126 and 841, respectively, with no effect (P > 0.05) of the treatment factor. The values observed for GV and TPP were higher than 25.9% and 6.4 g·dL−1, respectively, which were considered normal. As organic fertilizer, the fractionated application of in natura castor bean cake does not reduce the contamination of pastures by nematode larvae. The evaluated feeds improve the resilience of the sheep to infection by gastrointestinal parasites. The treatments using castor bean cake reduced the adult parasites present in the abomasum of sheep.
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Faria LEM, Ferreira OBADS, Machado AL, Costa JN, Perinotto WMDS. Monitoring environmental conditions on the speed of development and larval migration of gastrointestinal nematodes in Urochloa decumbens in northeastern Brazil. Vet Parasitol Reg Stud Reports 2022; 31:100732. [PMID: 35569915 DOI: 10.1016/j.vprsr.2022.100732] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2021] [Revised: 03/31/2022] [Accepted: 04/12/2022] [Indexed: 06/15/2023]
Abstract
The study aimed to evaluate the speed of development of gastrointestinal nematodes (GIN) eggs to infective larvae (L3) and its migration under effect of meteorological variables: temperature, rainfall, relative humidity, solar radiation to Urochloa (=Brachiaria) decumbens grass pasture during rainy season, from June to September 2019, and dry season, October to March 2020, in Recôncavo baiano region of Bahia state, Brazil. Monthly, fecal samples obtained from goats with recurrent GIN infection were deposited in six plots of one square meter. In +7, +14 and + 21-days post-deposition, lower and upper strata grass (0-15 and > 15 cm, respectively) and remaining feces were collected and submitted to Baermann's technique modified to perform larval count and identification. Meteorological data were obtained from a local weather station database. The log-transformed larval count results were analyzed regarding the collection day effect, stratum effect, comparing the means by Tukey's test (p < 0.05). Multivariate regression analysis and correlation of meteorological variables with larval counts was performed. In the rainy season, the largest proportion of recovered L3 was concentrated in +7-days post-deposition in the months of June and July, both in the remaining feces and herbage samples, while in August development took place more slowly, after +14-days post-deposition. During the dry season, L3 development only occurred after the first collection in January and February. Lower strata had higher proportion of recovery than in upper strata. Negative correlation was found for solar radiation. Greater rainfall in the rainy season compared to dry season was a favorable condition for high contamination of grass samples. However, reduced vertical migration to upper strata may have been influenced by low temperatures during the rainy season. Regarding the genera present in the fecal samples used in the experiment were found Haemonchus sp., Trichostrongylus sp. and Oesophagostomum sp. Thus, it is possible to conclude that in the region of the study, during the rainy season, there is a rapid larval development and the L3 are able to migrate more effectively to the grass. On the other hand, in the dry season, larval development tends to be slower, with less migration to the grass. Solar radiation can be useful for predicting months with the highest risk of infection. Therefore, prophylactic measures should be employed in goat herds during the rainy season whilst natural reduced pasture contamination in the dry season may favor animal maintenance for a longer time.
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Affiliation(s)
- Luis Eduardo Meira Faria
- Curso de Pós-graduação em Ciência Animal, Centro de Ciências Agrárias, Ambientais e Biológicas, Universidade Federal do Recôncavo da Bahia, Cruz das Almas CEP 44380-000, BA, Brazil
| | | | - Alessandro Lima Machado
- Centro de Ciências Agrárias, Ambientais e Biológicas, Universidade Federal do Recôncavo da Bahia, Cruz das Almas CEP 44380-000, BA, Brazil.
| | - Joselito Nunes Costa
- Curso de Pós-graduação em Defesa Agropecuária, Centro de Ciências Agrárias, Ambientais e Biológicas, Universidade Federal do Recôncavo da Bahia, Cruz das Almas CEP 44380-000, BA, Brazil.
| | - Wendell Marcelo de Souza Perinotto
- Curso de Pós-graduação em Ciência Animal, Centro de Ciências Agrárias, Ambientais e Biológicas, Universidade Federal do Recôncavo da Bahia, Cruz das Almas CEP 44380-000, BA, Brazil.
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A Review: Haemonchus contortus Infection in Pasture-Based Sheep Production Systems, with a Focus on the Pathogenesis of Anaemia and Changes in Haematological Parameters. Animals (Basel) 2022; 12:ani12101238. [PMID: 35625083 PMCID: PMC9137471 DOI: 10.3390/ani12101238] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2022] [Revised: 03/21/2022] [Accepted: 05/09/2022] [Indexed: 11/21/2022] Open
Abstract
Simple Summary Infection with Haemonchus contortus parasites (haemonchosis) is an important cause of anaemia in sheep. Haemonchosis is a global problem, although sheep that are kept in warm, high rainfall environments are at the greatest risk of infection due to the favourable conditions for H. contortus survival. Following ingestion, the parasites develop in the abomasum of sheep. Various factors such as age, breed, health, nutritional status, and larval challenge influence the severity of clinical disease. Hyperacute, acute, and chronic haemonchosis are reviewed, focusing on the pathophysiology of haemonchosis, associated clinical signs, and haematological and biochemical findings. Abstract Haemonchosis is an important cause of anaemia in sheep worldwide, particularly those that are kept in pasture-based systems in warm, high rainfall environments. Potential outcomes vary based on the severity of infection and the sheep’s immune response, however, in some sheep infection can lead to death. The consequences of Haemonchus contortus infection mean that it has been well-studied in a range of different farming systems. However, to our knowledge, there has not been a recent review focused on the pathophysiology of anaemia caused by haemonchosis. Thus, this review provides an in-depth discussion of the literature related to the pathophysiology of haemonchosis and associated clinical signs for hyperacute, acute, and chronic haemonchosis. Additionally, haematological and biochemical findings are presented, and various diagnostic methods are assessed.
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Gyeltshen T, Kahn LP, Laurenson YC. Ecology of the free-living stages of Trichostrongylid parasites of sheep. Vet Parasitol 2022; 303:109683. [DOI: 10.1016/j.vetpar.2022.109683] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Revised: 02/22/2022] [Accepted: 02/24/2022] [Indexed: 11/17/2022]
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Garcia-Méndez M, Schmitt-Filho AL, Rocha RA, Bricarello PA. Effect of growing forage legumes on the migration and survival in the pasture of gastrointestinal nematodes of sheep. J Helminthol 2022; 96:e77. [DOI: 10.1017/s0022149x22000591] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/31/2023]
Abstract
Abstract
In order to identify types of forage that inhibit pasture contamination, an evaluation was performed of the effect of the forage legumes Trifolium repens (white clover), Trifolium pratense (red clover) and Lotus corniculatus (bird's-foot-trefoil) on the survival and migration of infective larvae (L3) of gastrointestinal nematodes (GIN) of sheep. An experimental area of 441 m2 was divided into four blocks, subdivided into areas of 1.20 × 1.20 in which the three forage legumes were separately overseeded. After growth of the forage in each subdivision, experimental units were established that were later artificially contaminated with sheep faeces containing GIN eggs. Between October and December 2018, pasture, faecal and soil samples were collected on four occasions during weeks 1, 2, 4 and 8 after the deposition of faeces. In week 6, the forage legumes in all the experimental units were mown to simulate grazing. The number of L3 was quantified to determine their survival in the pasture, faeces and soil. In addition, the horizontal migration of L3 was measured at two distances from the faecal pellets (10 and 30 cm), as well as their vertical migration at two heights of the plant stems, that is, lower half and upper half. Larvae vertical migration was affected by the forage species (P < 0.001), in that bird's-foot-trefoil contained fewer larvae in the upper stratum. Bird's-foot-trefoil restricted the migration of L3 to the upper stratum of the plant, which could potentially decrease the risk of infection by intestinal nematodes in grazing sheep.
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Wang T, Redman EM, Morosetti A, Chen R, Kulle S, Morden N, McFarland C, Vineer HR, Colwell DD, Morgan ER, Gilleard JS. Seasonal epidemiology of gastrointestinal nematodes of cattle in the northern continental climate zone of western Canada as revealed by internal transcribed spacer-2 ribosomal DNA nemabiome barcoding. Parasit Vectors 2021; 14:604. [PMID: 34895334 PMCID: PMC8665551 DOI: 10.1186/s13071-021-05101-w] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2021] [Accepted: 11/17/2021] [Indexed: 01/04/2023] Open
Abstract
Background Gastrointestinal nematode (GIN) epidemiology is changing in many regions of the world due to factors such as global warming and emerging anthelmintic resistance. However, the dynamics of these changes in northern continental climate zones are poorly understood due to a lack of empirical data. Methods We studied the accumulation on pasture of free-living infective third-stage larvae (L3) of different GIN species from fecal pats deposited by naturally infected grazing cattle. The field study was conducted on three organic farms in Alberta, western Canada. Grass samples adjacent to 24 fecal pats were collected from each of three different pastures on each farm. Internal transcribed spacer-2 nemabiome metabarcoding was used to determine the GIN species composition of the harvested larvae. The rotational grazing patterns of the cattle ensured that each pasture was contaminated only once by fecal pat deposition. This design allowed us to monitor the accumulation of L3 of specific GIN species on pastures under natural climatic conditions without the confounding effects of pasture recontamination or anthelmintic treatments. Results In seven out of the nine pastures, grass L3 counts peaked approximately 9 weeks after fecal deposition and then gradually declined. However, a relatively large number of L3 remained in the fecal pats at the end of the grazing season. Nemabiome metabarcoding revealed that Cooperia oncophora and Ostertagia ostertagi were the two most abundant species on all of the pastures and that the dynamics of larval accumulation on grass were similar for both species. Daily precipitation and temperature across the whole sampling period were similar for most of the pastures, and multiple linear regression showed that accumulated rainfall 1 week prior to sample collection had a significant impact on the pasture L3 population, but accumulated rainfall 3 weeks prior to sample collection did not. Conclusions The results suggest that the pasture L3 population was altered by short-term microclimatic conditions conducive for horizontal migration onto grass. Overall, the results show the importance of the fecal pat as a refuge and reservoir for L3 of cattle GIN on western Canadian pastures, and provide an evidence base for the risk assessment of rotational grazing management in the region. Graphical Abstract ![]()
Supplementary Information The online version contains supplementary material available at 10.1186/s13071-021-05101-w.
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Affiliation(s)
- Tong Wang
- Host-Parasite Interactions Program, Faculty of Veterinary Medicine, University of Calgary, Calgary, Canada.
| | - Elizabeth M Redman
- Host-Parasite Interactions Program, Faculty of Veterinary Medicine, University of Calgary, Calgary, Canada
| | - Arianna Morosetti
- Host-Parasite Interactions Program, Faculty of Veterinary Medicine, University of Calgary, Calgary, Canada
| | - Rebecca Chen
- Host-Parasite Interactions Program, Faculty of Veterinary Medicine, University of Calgary, Calgary, Canada
| | - Sarah Kulle
- Host-Parasite Interactions Program, Faculty of Veterinary Medicine, University of Calgary, Calgary, Canada
| | - Natasha Morden
- Host-Parasite Interactions Program, Faculty of Veterinary Medicine, University of Calgary, Calgary, Canada
| | | | - Hannah Rose Vineer
- Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool, Liverpool, UK
| | | | - Eric R Morgan
- School of Biological Sciences, Queen's University Belfast, Belfast, UK
| | - John S Gilleard
- Host-Parasite Interactions Program, Faculty of Veterinary Medicine, University of Calgary, Calgary, Canada.
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Khanyari M, Suryawanshi KR, Milner-Gulland EJ, Dickinson E, Khara A, Rana RS, Rose Vineer H, Morgan ER. Predicting Parasite Dynamics in Mixed-Use Trans-Himalayan Pastures to Underpin Management of Cross-Transmission Between Livestock and Bharal. Front Vet Sci 2021; 8:714241. [PMID: 34660759 PMCID: PMC8511524 DOI: 10.3389/fvets.2021.714241] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2021] [Accepted: 08/31/2021] [Indexed: 11/17/2022] Open
Abstract
The complexities of multi-use landscapes require sophisticated approaches to addressing disease transmission risks. We explored gastro-intestinal nematode (GINs) infections in the North India Trans-Himalayas through a socio-ecological lens, integrating parasite transmission modelling with field surveys and local knowledge, and evaluated the likely effectiveness of potential interventions. Bharal (blue sheep; Pseudois nayaur), a native wild herbivore, and livestock share pasture year-round and livestock commonly show signs of GINs infection. While both wild and domestic ungulates had GINs infections, egg counts indicated significantly higher parasite burdens in bharal than livestock. However, due to higher livestock densities, they contributed more to the total count of eggs and infective larvae on pasture. Herders also reported health issues in their sheep and goats consistent with parasite infections. Model simulations suggested that pasture infectivity in this system is governed by historical pasture use and gradually accumulated larval development during the summer, with no distinct short-term flashpoints for transmission. The most effective intervention was consequently predicted to be early-season parasite suppression in livestock using temperature in spring as a cue. A 1-month pause in egg output from livestock could lead to a reduction in total annual availability of infective larvae on pasture of 76%, potentially benefitting the health of both livestock and bharal. Modelling suggested that climate change over the past 33 years has led to no overall change in GINs transmission potential, but an increase in the relative influence of temperature over precipitation in driving pasture infectivity. Our study provides a transferable multi-pronged approach to investigating disease transmission, in order to support herders' livelihoods and conserve wild ungulates.
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Affiliation(s)
- Munib Khanyari
- Nature Conservation Foundation, Bangalore, India.,Interdisciplinary Centre for Conservation Sciences, Oxford, United Kingdom.,Department of Biological Sciences, University of Bristol, Bristol, United Kingdom
| | | | - E J Milner-Gulland
- Interdisciplinary Centre for Conservation Sciences, Oxford, United Kingdom
| | - Eleanor Dickinson
- School of Biological Sciences, Queen's University, Belfast, United Kingdom
| | | | | | - Hannah Rose Vineer
- Department of Biological Sciences, University of Bristol, Bristol, United Kingdom
| | - Eric R Morgan
- Department of Biological Sciences, University of Bristol, Bristol, United Kingdom.,School of Biological Sciences, Queen's University, Belfast, United Kingdom
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Gasparina JM, Baby RG, Fonseca L, Bricarello PA, Rocha RAD. Infective larvae of Haemonchus contortus found from the base to the top of the grass sward. ACTA ACUST UNITED AC 2021; 30:e028120. [PMID: 34076058 DOI: 10.1590/s1984-29612021032] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Accepted: 05/19/2021] [Indexed: 11/22/2022]
Abstract
The resistance of gastrointestinal nematodes (GIN) of sheep to anthelmintic treatment has motivated researchers to seek alternatives to reduce the use of these drugs in sheep farming and decontaminate pastureland based on knowledge about the survival dynamics of larvae. The aim of this work was to evaluate the migration of the infective larvae (L3) of Haemonchus contortus at different times of the day, strata, and sward heights, with and without shade after the deposition of contaminated sheep feces. The grass species used here was Cynodon dactylon cv. Tifton 85 in four treatments: low sward height shade; low sward height sunshine; high sward height shade; and high sward height sunshine. The number of L3 recovered from the pasture at different times of the day did not differ. The highest number of L3 recovered was in shade. The number of L3 at different times and strata occurred uniformly, confirming that L3 remain in the same place after migrating from dung at the hottest times of the day. Infective larvae of H. contortus were able to migrate across all the strata regardless of the time of day in the summer season in humid subtropical climate.
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Affiliation(s)
- Jennifer Mayara Gasparina
- Programa de Pós-graduação em Zootecnia, Universidade Estadual de Ponta Grossa - UEPG, Ponta Grossa, PR, Brasil
| | - Renata Grasieli Baby
- Programa de Pós-graduação em Zootecnia, Universidade Estadual de Ponta Grossa - UEPG, Ponta Grossa, PR, Brasil
| | - Lidiane Fonseca
- CONSIPA - Consultoria em Sistemas Integrados de Produção Agropecuária, Ponta Grossa, PR, Brasil
| | - Patrizia Ana Bricarello
- Departamento de Zootecnia e Desenvolvimento Rural, Centro de Ciências Agrárias - CCA, Universidade Federal de Santa Catarina - UFSC, Florianópolis, SC, Brasil
| | - Raquel Abdallah da Rocha
- Programa de Pós-graduação em Zootecnia, Universidade Estadual de Ponta Grossa - UEPG, Ponta Grossa, PR, Brasil.,Departamento de Zootecnia, Universidade Estadual de Ponta Grossa - UEPG, Ponta Grossa, PR, Brasil
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Shadman M, Meshgi B, Fathi S, Hanafi-Bojd AA, Majidi-Rad M, Modabbernia G. Mapping habitat suitability for gastrointestinal nematodiasis of ruminants in southern Caspian Sea littoral: a predicted risk pattern model based on the MaxEnt. Trop Anim Health Prod 2020; 52:3843-3854. [PMID: 33047225 DOI: 10.1007/s11250-020-02423-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2020] [Accepted: 09/24/2020] [Indexed: 11/25/2022]
Abstract
Herein, we provide the ecological niches of gastrointestinal nematode infections in Guilan, Mazandaran, and Golestan provinces. For this purpose, 2688 fecal specimens of sheep and cattle were subjected to the flotation method. For modeling procedure, the results were analyzed by considering 23 bioclimatic and environmental variables as well as 96 points/locations. Maximum entropy (model MaxEnt) was used to visualize the spatial distribution of gastrointestinal nematodes. The relative importance of all variables was also assessed by using jackknife analysis. The highest proportion of sheep infection with strongyle-type egg was observed in Golestan province (57.8%) and the lowest in Guilan province (49.5%), and eggs per gram (EPG) was around 21-29. The parasites with the highest proportion of infection in both domestic animals included strongyle-type eggs. Among the different bioclimatic and environmental variables, the biggest contributor to habitat suitability of the gastrointestinal nematode presence was found to be minimum temperature of the coldest month (Bio6), precipitation of driest quarter (Bio17), precipitation of coldest quarter (Bio19), and altitude. The MaxEnt model was able to provide a suitable guidance for predicting the probability distribution of gastrointestinal nematodes under bioclimatic and environmental variables, and the findings pave way for integrated gastrointestinal nematode surveillance and control strategies in the southern strip of Caspian Sea. In addition, the low intensity of gastrointestinal nematodiasis in ruminants may be associated with the frequent administration of anthelmintic drugs, where actions are needed to investigate drug resistance in the areas concerned and to provide anthelmintic drugs administration in a targeted manner.
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Affiliation(s)
- M Shadman
- Department of Parasitology, Faculty of Veterinary Medicine, University of Tehran, P.O.Box 14155-6453, Tehran, Iran
| | - B Meshgi
- Department of Parasitology, Faculty of Veterinary Medicine, University of Tehran, P.O.Box 14155-6453, Tehran, Iran.
| | - S Fathi
- Department of Parasitology, Faculty of Veterinary Medicine, University of Tehran, P.O.Box 14155-6453, Tehran, Iran
| | - A A Hanafi-Bojd
- Department of Medical Entomology & Vector Control, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
| | - M Majidi-Rad
- Department of Parasitology, Faculty of Veterinary Medicine, University of Tehran, P.O.Box 14155-6453, Tehran, Iran
| | - G Modabbernia
- Department of Parasitology, Faculty of Veterinary Medicine, University of Tehran, P.O.Box 14155-6453, Tehran, Iran
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A systematic review and meta-analysis on the prevalence, distribution and nematode species diversity in small ruminants: a Nigerian perspective. J Parasit Dis 2020; 44:702-718. [PMID: 33184537 DOI: 10.1007/s12639-020-01249-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2020] [Accepted: 07/13/2020] [Indexed: 10/23/2022] Open
Abstract
Despite the global projections that agriculture will have to feed an additional 3 billion of the world's population in the nearest future, the global trends and negative impacts of nematodes on livestock productivity are still on the increase. Here, we reported the burden of gastrointestinal nematodes in small ruminants in Nigeria. Six thousand, five hundred and eighty one of the 13,259 small ruminants reported in 40 eligible studies across 18 Nigerian States were infected with at least one nematode species, yielding an overall pooled prevalence (PP) of 58.3% (95% CI 48.8, 67.2). Regional PP varied significantly (P < 0.001) and ranged between 19.5 (95% CI 5.8, 48.7) and 83.7% (95% CI 68.5, 92.3). Seasonal PP was higher in the dry (Prev: 56.5%, 95% CI 34.2, 76.4) than the rainy (Prev: 43.2%, 95% CI 26.7, 61.3) season. Haemonchus species were the most prevalent 21.3% while, Trichuris ovis and Strongyloides species had the widest geographic distribution. Several species of nematodes of small ruminants are highly prevalent in Nigeria. An all-inclusive approach involving public education and standardised management practices that involve adequate hygiene and sanitation, strategic and prophylactic use of anthelmintics, rotational grazing and the control of arthropod intermediate hosts will reduce the economic losses due to these parasites and curtail possible transmission to humans.
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Zajac AM, Garza J. Biology, Epidemiology, and Control of Gastrointestinal Nematodes of Small Ruminants. Vet Clin North Am Food Anim Pract 2020; 36:73-87. [PMID: 32029190 DOI: 10.1016/j.cvfa.2019.12.005] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
Strongylid gastrointestinal nematodes are an important cause of disease and economic loss in small ruminants. These parasites are important in most of the United States, with the bloodsucking parasite Haemonchus contortus being the predominant species of concern. Sheep and goats are infected while grazing, and the biology of infective larvae on pastures is important in the design of parasite management programs. Widespread resistance to anthelmintics requires strategies designed to preserve remaining drug activity; these include combination treatments with multiple classes of anthelmintics and targeted treatments.
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Affiliation(s)
- Anne M Zajac
- Department of Biomedical Sciences and Pathobiology, Virginia/Maryland College of Veterinary Medicine, Virginia Tech, Blacksburg, VA 24061-0442, USA.
| | - Javier Garza
- Leica Biosystems, 1700 Leider Lane, Buffalo Grove, IL 60089, USA
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Almeida FA, Albuquerque ACA, Bassetto CC, Starling RZC, Lins JGG, Amarante AFT. Long spelling periods are required for pasture to become free of contamination by infective larvae of Haemonchus contortus in a humid subtropical climate of São Paulo state, Brazil. Vet Parasitol 2020; 279:109060. [PMID: 32143013 DOI: 10.1016/j.vetpar.2020.109060] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2019] [Revised: 02/19/2020] [Accepted: 02/20/2020] [Indexed: 11/19/2022]
Abstract
The objective of this trial was to evaluate the period of spelling necessary for a pasture to become free of contamination by infective larvae of gastrointestinal nematodes (GIN) of sheep, in different seasons of the year, as well as to determine when the greatest pasture contamination occurs and how long it lasts. An area was divided into four paddocks, one for each season (spring, summer, autumn, and winter). In order to contaminate the paddocks with free living stages of GIN, eight ewes, naturally infected, grazed on each paddock for 14 consecutive days, starting on the following dates: autumn, on April 4, 2017; winter, on July 4, 2017; spring, on September 26, 2017; summer, on January 2, 2019. At the beginning and end of the grazing period, faecal samples were taken directly from the rectums of the ewes to count eggs per gram of faeces (EPG) and for faecal cultures. Every 14 days pasture samples were collected to assess the number of infective larvae (L3) per kilogram of dry matter. At the end of the 14 day ewe grazing period, 21 stakes were placed where there were faeces on the paddock. Subsequently, every 14 days, the faeces located at three of the stakes were collected and the L3 were recovered. After the exit of the ewes, monthly, two tracer lambs, free of helminth infection, were allocated into the paddock for 14 days. At the end of this period they were housed in covered stalls for 28 days. Faeces from the lambs were collected for individual EPG counting and faecal culture at 21 and 28 days after grazing. Infective larvae recuperation was observed from faeces and pasture in all seasons. In the autumn, spring, and summer, high EPG counts were observed in the first tracer lambs (8521, 4800, and 8064 EPG, respectively), while in winter, high infection (14132 EPG) of the animals was observed only from the second pair of tracer lambs. For a pasture to become "clean", 322 days, 350 days, 294 days, and 182 days following contamination were necessary, respectively, in the autumn, winter, spring, and summer. In autumn, spring, and summer, massive contamination of the pasture with L3 occurred soon after an area had been grazed by infected sheep, while in winter this took a little longer. The contamination persisted, approximately, from a minimum of six months post contamination in summer to up to almost one year post contamination in winter.
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Affiliation(s)
- Fabiana A Almeida
- Instituto De Biociências, Universidade Estadual Paulista (UNESP), Botucatu, SP, Brazil.
| | - Ana Cláudia A Albuquerque
- Faculdade De Medicina Veterinária e Zootecnia, Universidade Estadual Paulista (UNESP), Botucatu, SP, Brazil
| | - César C Bassetto
- Instituto De Biociências, Universidade Estadual Paulista (UNESP), Botucatu, SP, Brazil
| | - Renan Z C Starling
- Faculdade De Medicina Veterinária e Zootecnia, Universidade Estadual Paulista (UNESP), Botucatu, SP, Brazil
| | - José Gabriel G Lins
- Faculdade De Medicina Veterinária e Zootecnia, Universidade Estadual Paulista (UNESP), Botucatu, SP, Brazil
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Criollo goats limit their grass intake in the early morning suggesting a prophylactic self-medication behaviour in a heterogeneous vegetation. Trop Anim Health Prod 2019; 51:2473-2479. [PMID: 31197723 DOI: 10.1007/s11250-019-01966-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2019] [Accepted: 06/04/2019] [Indexed: 10/26/2022]
Abstract
The present study compared the feeding behaviour of goats in the early morning (EM = 7:00-8:30 a.m.) and late morning (LM = 9:30-11:00 a.m.) in response to their natural gastrointestinal nematode (GIN) infection status. Twelve female adult goats (37 ± 7.7 kg live weight (LW); 5 ± 1 years) with browsing experience in the tropical deciduous forest were divided into two groups (n = 6): INF group, with natural GIN infection, and non-infected (NI) group, dewormed with moxidectin (0.4 mg/kg LW subcutaneous). Feeding behaviour (dry matter intake (DMI)) of two resource types (grasses vs. shrubs + herbs) was estimated by direct observation for 4 weeks on two grazing moments (EM vs. LM). Environmental temperature and relative humidity at pasture level were measured twice weekly. The GIN egg counts and goats' LW were measured on days 0, 14 and 28. Temperature (mean ± standard deviation) at EM (26.2 ± 1.5 °C) was lower than at LM (38.7 ± 1 °C; P < 0.01). Humidity was higher on the EM (85.1 ± 2.6%) compared to LM (60.4 ± 5.6%; P < 0.01). Irrespective of the infection status, goats consumed similar amounts of grass and shrubs + herbs during EM (P > 0.05). On the other hand, the experimental groups consumed more grass than shrubs + herbs during LM (P < 0.05). The latter suggested prophylactic behaviours strategies to (a) avoid GIN infective larvae, (b) balance the protein:energy ratio of the diet and (c) avoid saturation of detoxification pathways for the secondary compounds consumed from shrubs + herbs. The constant consumption of shrubs + herbs during the study may have reduced the GIN egg count of the INF group.
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Sauermann CW, Leathwick DM. A climate-driven model for the dynamics of the free-living stages of Cooperia oncophora. Vet Parasitol 2018; 255:83-90. [DOI: 10.1016/j.vetpar.2018.03.026] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2017] [Revised: 03/28/2018] [Accepted: 03/29/2018] [Indexed: 01/09/2023]
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Keli A, Ribeiro L, Gipson T, Puchala R, Tesfai K, Tsukahara Y, Sahlu T, Goetsch A. Effects of pasture access regime on performance, grazing behavior, and energy utilization by Alpine goats in early and mid-lactation. Small Rumin Res 2017. [DOI: 10.1016/j.smallrumres.2017.07.004] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Molnár PK, Sckrabulis JP, Altman KA, Raffel TR. Thermal Performance Curves and the Metabolic Theory of Ecology-A Practical Guide to Models and Experiments for Parasitologists. J Parasitol 2017; 103:423-439. [PMID: 28604284 DOI: 10.1645/16-148] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Climate change will affect host-parasite dynamics in complex ways. The development of forecast models is necessary for proactive disease management, but past studies have frequently reported thermal performance data in idiosyncratic ways that have limited use for parameterizing thermal host-parasite models. Development of improved forecast models will require strong collaborations between experimental parasitologists and disease modelers. The purpose of this article is to facilitate such collaborations by reviewing practical considerations for describing thermal performance curves of parasite and host performance traits, and using them to predict climate change impacts on host-parasite systems. In the first section, we provide an overview of how thermal performance curves can be embedded in life-cycle-based dynamical models of parasitism, and we outline how such models can capture the net effect of multiple nonlinear temperature dependencies affecting the host-parasite dynamics. We also discuss how macroecological generalities based on the metabolic theory of ecology (MTE) can be used to determine a priori parameter estimates for thermal performance curves to derive null models for data-deficient species, but we note that most of the generalities suggested by MTE remain to be tested for parasites. In the second section, we discuss empirical knowledge gaps for the temperature dependence of parasite and host performance traits, and we outline the types of data that need to be collected to inform MTE-based models for data-deficient species. We specifically emphasize the importance of (1) capturing the entire thermal response of performance traits, including lower and upper temperature thresholds, and (2) experimentally or statistically separating out the thermal responses of different performance traits (e.g., development and mortality) rather than only reporting composite measures (e.g., apparent development). Not adhering to these principles can lead to biased climate change impact predictions. In the third section, we provide a practical guide outlining how experimentalists can contribute to fill data gaps by measuring the temperature dependence of host and parasite performance traits in ways that are systematic, statistically rigorous, and consistent with the requirements of life cycle-based host-parasite models. This guide includes recommendations and practical examples illustrating (1) the use of perturbation analyses to determine experimental priorities, (2) experimental design tips for quantifying thermal response curves, and (3) statistical methods for estimating the parameters of thermal performance curves. Our hope is that this article helps researchers to maximize the value and use of future data collections for both empirical and modelling studies investigating the way in which temperature influences parasitism.
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Affiliation(s)
- Péter K Molnár
- Department of Biological Sciences, University of Toronto Scarborough, 1265 Military Trail, Toronto, Ontario, M1C 1A4, Canada
| | - Jason P Sckrabulis
- Department of Biological Sciences, University of Toronto Scarborough, 1265 Military Trail, Toronto, Ontario, M1C 1A4, Canada
| | - Karie A Altman
- Department of Biological Sciences, University of Toronto Scarborough, 1265 Military Trail, Toronto, Ontario, M1C 1A4, Canada
| | - Thomas R Raffel
- Department of Biological Sciences, University of Toronto Scarborough, 1265 Military Trail, Toronto, Ontario, M1C 1A4, Canada
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Bastos GA, Fonseca LD, de Paiva Ferreira AV, Costa MAMS, Silva MLF, de Oliveira Vasconcelos V, de Sousa RM, Duarte ER. Helminthiasis characterization and anthelmintic efficacy for ewes and lambs raised in tropical semiarid region. Trop Anim Health Prod 2017; 49:937-943. [PMID: 28352962 DOI: 10.1007/s11250-017-1276-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2016] [Accepted: 03/15/2017] [Indexed: 11/26/2022]
Abstract
In this study the helminthiasis and anthelmintic effectiveness in ewes and lambs were evaluated in a semiarid region of Brazil. Twelve sheep farms were investigated using semi-structured questionnaires and fecal egg count (FEC) reduction test was employed to analyze the profile of anthelmintic resistance. Groups of at least 10 animals with FEC ≥ 300 were selected. After 12 h of fasting, homogeneous groups of lambs or ewes were treated with albendazole, levamisole moxidectin, or oxfendazole and control groups were not treated. Feces were collected before treatments and 14 days after, and larvae genera were identified after cuprocultures in both periods. Extensive grazing was the predominant creation system, using hybrid Santa Ines animals. The separation by age was promoted in 75% of herds; however, maternity pickets there were only in three farms. The strategic treatments were performed only in 8.4% of sheep farms and 16.6% used the anthelmintic efficacy test and alternated anthelmintic classes after 1 year. The initial FEC means for lambs were significantly higher than ewe FEC averages. For lamb tests, moxidectin and levamisole showed higher efficacy (p ≤ 0.05) than benzimidazoles. For ewe tests, moxidectin and levamisole showed efficiencies >75%. Haemonchus spp. and Trichostrongylus spp. were the most frequent nematodes before treatments and the genus Haemonchus was the most prevalent after anthelmintic treatments (p < 0.05). Variations of anthelmintic susceptibility were observed for categories and herds evaluated, which emphasizes the importance of the effectiveness tests for the choice of anthelmintics for ewes and lambs.
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Affiliation(s)
- Gabriela Almeida Bastos
- Federal University of Minas Gerais, Institute of Agricultural Sciences, Avenida Universitária, 1000, BairroUniversitário, Montes Claros, Minas Gerais, 39400-006, Brazil
| | - Leydiana Duarte Fonseca
- Federal University of Minas Gerais, Institute of Agricultural Sciences, Avenida Universitária, 1000, BairroUniversitário, Montes Claros, Minas Gerais, 39400-006, Brazil
| | - Adriano Vinícius de Paiva Ferreira
- Federal University of Minas Gerais, Institute of Agricultural Sciences, Avenida Universitária, 1000, BairroUniversitário, Montes Claros, Minas Gerais, 39400-006, Brazil
| | - Marco Aurélio Morais Soares Costa
- Federal University of Minas Gerais, Institute of Agricultural Sciences, Avenida Universitária, 1000, BairroUniversitário, Montes Claros, Minas Gerais, 39400-006, Brazil
| | - Maria Luiza França Silva
- Federal University of Minas Gerais, Institute of Agricultural Sciences, Avenida Universitária, 1000, BairroUniversitário, Montes Claros, Minas Gerais, 39400-006, Brazil
| | - Viviane de Oliveira Vasconcelos
- Federal University of Minas Gerais, Institute of Agricultural Sciences, Avenida Universitária, 1000, BairroUniversitário, Montes Claros, Minas Gerais, 39400-006, Brazil
| | - Rogério Marcos de Sousa
- Federal University of Minas Gerais, Institute of Agricultural Sciences, Avenida Universitária, 1000, BairroUniversitário, Montes Claros, Minas Gerais, 39400-006, Brazil
| | - Eduardo Robson Duarte
- Federal University of Minas Gerais, Institute of Agricultural Sciences, Avenida Universitária, 1000, BairroUniversitário, Montes Claros, Minas Gerais, 39400-006, Brazil.
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Babayani ND, van Wyk JA, Morgan ER. An elaborated SIR model for haemonchosis in sheep in South Africa under a targeted selective anthelmintic treatment regime. Prev Vet Med 2016; 134:160-169. [PMID: 27836039 DOI: 10.1016/j.prevetmed.2016.10.016] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2016] [Revised: 09/04/2016] [Accepted: 10/19/2016] [Indexed: 10/20/2022]
Abstract
Infection with the abomasal nematode Haemonchus contortus is responsible for considerable production loss in small ruminants globally, and especially in warm, summer-rainfall regions. Previous attempts to predict infection levels have followed the traditional framework for macroparasite models, i.e. tracking parasite population sizes as a function of host and climatic factors. Targeted treatment strategies, in which patho-physiological indices are used to identify the individuals most affected by parasites, could provide a foundation for alternative, incidence-based epidemiological models. In this paper, an elaboration of the classic susceptible-infected-recovered (SIR) model framework for microparasites was adapted to haemonchosis and used to predict disease in Merino sheep on a commercial farm in South Africa. Incidence was monitored over a single grazing season using the FAMACHA scoring system for conjunctival mucosal coloration, which indicates high burdens of H. contortus, and used to fit the model by estimating transmission parameters. The model predicted force of infection (FOI) between sequential FAMACHA monitoring events in groups of dry, pregnant and lactating ewes, and related FOI to factors including climate (temperature, rainfall and rainfall entropy), using a random effects model with reproductive status group as the cluster variable. Temperature and rainfall in the seven days prior to monitoring significantly predicted the interval FOI (p≤0.002), while rainfall entropy did not (p=0.289). Differences across the three groups accounted for approximately 90% of the variability in the interval FOI over the period of investigation. Maintained FOI during targeted treatment of cases of haemonchosis suggests strong underlying transmission from sub-clinically infected animals, and/or limited impact on pre-existing pasture contamination by removal of clinical worm burdens later in the grazing season. The model has the potential to contribute to the sustainable management of H. contortus by predicting periods of heightened risk, and hence to focus and optimise limited resources for monitoring and treatment. SIR-type model frameworks are an alternative to classic abundance-based compartmental models of macroparasite epidemiology, and could be useful where incidence data are available. Significant challenges remain, however, in the ability to calibrate such models to field data at spatial and temporal scales that are useful for decision support at farm level.
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Affiliation(s)
- Nlingisisi D Babayani
- Department of Veterinary Tropical Diseases, Faculty of Veterinary Science, University of Pretoria, Private Bag X04, Onderstepoort, 0110, South Africa.
| | - Jan A van Wyk
- Department of Veterinary Tropical Diseases, Faculty of Veterinary Science, University of Pretoria, Private Bag X04, Onderstepoort, 0110, South Africa
| | - Eric R Morgan
- School of Veterinary Sciences, University of Bristol, Langford House, Langford, North Somerset BS40 5DU, UK.
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The Pathophysiology, Ecology and Epidemiology of Haemonchus contortus Infection in Small Ruminants. ADVANCES IN PARASITOLOGY 2016; 93:95-143. [PMID: 27238004 DOI: 10.1016/bs.apar.2016.02.022] [Citation(s) in RCA: 131] [Impact Index Per Article: 16.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The parasitic nematode Haemonchus contortus occurs commonly in small ruminants, and it is an especially significant threat to the health and production of sheep and goats in tropical and warm temperate zones. The main signs of disease (haemonchosis) relate to its blood-feeding activity, leading to anaemia, weakness and frequently to deaths, unless treatment is provided. Due to the high biotic potential, large burdens of H. contortus may develop rapidly when environmental conditions favour the free-living stages, and deaths may occur with little prior warning. More chronic forms of haemonchosis, resulting in reduced animal production and eventually deaths, occur with smaller persistent infections, especially in situations of prolonged, poor nutrition. The global distribution of the main haemonchosis-endemic zones is consistent with the critical requirements of the egg and larval stages of H. contortus for moisture and moderate to relatively warm temperatures, but the seasonal propensity for hypobiosis (inhibition of the fourth-stage larvae within the host) largely explains the common, though sporadic, outbreaks of haemonchosis in arid and colder environments. The wide climatic distribution may also reflect the adaptation of local isolates to less favourable ecological conditions, while an apparent increase in the prevalence of outbreaks in environments not previously considered endemic for haemonchosis - especially cold, temperate zones - may be attributable to climatic changes. Although the risk of haemonchosis varies considerably on a local level, even where H. contortus is endemic, the extensive range of ecological investigations provides a sound basis for predictions of the relative geographical and seasonal risk in relation to climatic conditions.
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Elevated temperatures and long drought periods have a negative impact on survival and fitness of strongylid third stage larvae. Int J Parasitol 2016; 46:229-37. [DOI: 10.1016/j.ijpara.2015.10.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2015] [Revised: 10/01/2015] [Accepted: 10/05/2015] [Indexed: 11/20/2022]
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Rose H, Caminade C, Bolajoko MB, Phelan P, van Dijk J, Baylis M, Williams D, Morgan ER. Climate-driven changes to the spatio-temporal distribution of the parasitic nematode, Haemonchus contortus, in sheep in Europe. GLOBAL CHANGE BIOLOGY 2016; 22:1271-1285. [PMID: 26482823 DOI: 10.1111/gcb.13132] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2015] [Accepted: 09/11/2015] [Indexed: 06/05/2023]
Abstract
Recent climate change has resulted in changes to the phenology and distribution of invertebrates worldwide. Where invertebrates are associated with disease, climate variability and changes in climate may also affect the spatio-temporal dynamics of disease. Due to its significant impact on sheep production and welfare, the recent increase in diagnoses of ovine haemonchosis caused by the nematode Haemonchus contortus in some temperate regions is particularly concerning. This study is the first to evaluate the impact of climate change on H. contortus at a continental scale. A model of the basic reproductive quotient of macroparasites, Q0 , adapted to H. contortus and extended to incorporate environmental stochasticity and parasite behaviour, was used to simulate Pan-European spatio-temporal changes in H. contortus infection pressure under scenarios of climate change. Baseline Q0 simulations, using historic climate observations, reflected the current distribution of H. contortus in Europe. In northern Europe, the distribution of H. contortus is currently limited by temperatures falling below the development threshold during the winter months and within-host arrested development is necessary for population persistence over winter. In southern Europe, H. contortus infection pressure is limited during the summer months by increased temperature and decreased moisture. Compared with this baseline, Q0 simulations driven by a climate model ensemble predicted an increase in H. contortus infection pressure by the 2080s. In northern Europe, a temporal range expansion was predicted as the mean period of transmission increased by 2-3 months. A bimodal seasonal pattern of infection pressure, similar to that currently observed in southern Europe, emerges in northern Europe due to increasing summer temperatures and decreasing moisture. The predicted patterns of change could alter the epidemiology of H. contortus in Europe, affect the future sustainability of contemporary control strategies, and potentially drive local adaptation to climate change in parasite populations.
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Affiliation(s)
- Hannah Rose
- School of Biological Sciences, Life Sciences Building, University of Bristol, Tyndall Avenue, Bristol, BS8 1TQ, UK
- School of Veterinary Sciences, University of Bristol, Langford House, Langford, Bristol, BS40 5DU, UK
- Cabot Institute, University of Bristol, Cantocks Close, Bristol, BS8 1TS, UK
| | - Cyril Caminade
- School of Environmental Sciences, University of Liverpool, Liverpool, UK
- Department of Epidemiology and Population Health, The Farr Institute @HeRC, University of Liverpool, Liverpool, L69 3GL, UK
| | - Muhammad Bashir Bolajoko
- School of Biological Sciences, Life Sciences Building, University of Bristol, Tyndall Avenue, Bristol, BS8 1TQ, UK
- National Veterinary Research Institute, P.M.B. 01, Vom, Plateau State, Nigeria
| | - Paul Phelan
- Animal & Grassland Research and Innovation Centre, Teagasc, Grange, Dunsanny, Co. Meath, Ireland
| | - Jan van Dijk
- Department of Epidemiology and Population Health, Institute of Infection and Global Health, University of Liverpool, Leahurst, Neston, Cheshire, CH64 7TE, UK
| | - Matthew Baylis
- School of Environmental Sciences, University of Liverpool, Liverpool, UK
- Health Protection Research Unit in Emerging and Zoonotic Infections, University of Liverpool, Neston, UK
| | - Diana Williams
- Department of Infection Biology, Institute of Infection and Global Health, University of Liverpool, Liverpool, L3 5RF, UK
| | - Eric R Morgan
- School of Veterinary Sciences, University of Bristol, Langford House, Langford, Bristol, BS40 5DU, UK
- Cabot Institute, University of Bristol, Cantocks Close, Bristol, BS8 1TS, UK
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Leathwick DM, Donecker JM, Nielsen MK. A model for the dynamics of the free-living stages of equine cyathostomins. Vet Parasitol 2015; 209:210-20. [DOI: 10.1016/j.vetpar.2015.02.031] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2014] [Revised: 02/27/2015] [Accepted: 02/28/2015] [Indexed: 11/17/2022]
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Rose H, Wang T, van Dijk J, Morgan ER. GLOWORM-FL: A simulation model of the effects of climate and climate change on the free-living stages of gastro-intestinal nematode parasites of ruminants. Ecol Modell 2015. [DOI: 10.1016/j.ecolmodel.2014.11.033] [Citation(s) in RCA: 73] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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26
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Assessment of the impact of plant species composition and drought stress on survival of strongylid third-stage larvae in a greenhouse experiment. Parasitol Res 2014; 113:4123-31. [PMID: 25164273 DOI: 10.1007/s00436-014-4084-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2014] [Accepted: 08/11/2014] [Indexed: 10/24/2022]
Abstract
Grazing livestock is always exposed to infective parasite stages. Depending on the general health status of the animal, the farm management, environmental conditions and pasture exposure, the impact ranges from non-affected to almost moribund animals. The greenhouse experiment was performed to investigate how climatic changes and plant composition influence the occurrence/survival of strongylid third-stage larvae (L3) on pasture. Ten different types of plant species compositions (eight replicates for each) were inoculated with approximately 10,000 Cooperia oncophora L3. The different plant compositions can be assorted to two groups: without legume content and with legume content (52-62% legume content). Half of the replicates were watered adequately, while the other half was hold under drought stress (DS), mimicking longer dry periods. During the DS cycles, the respective containers were not watered until they reached the wilting point. Grass samples were taken 1, 4 and 6 weeks after inoculation, soil samples were taken only once after 6 weeks and all samples were examined for occurrence of L3. After the second DS cycle, the number of L3 present on herbage samples was reduced significantly. The higher the legume content of the pasture composition, the higher is the L3 occurrence on pasture. Independent of the watering scheme, the soil served as the most important reservoir with consistently higher numbers of L3 in the soil compared to herbage.
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Wang T, van Wyk JA, Morrison A, Morgan ER. Moisture requirements for the migration of Haemonchus contortus third stage larvae out of faeces. Vet Parasitol 2014; 204:258-64. [PMID: 24893698 DOI: 10.1016/j.vetpar.2014.05.014] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2014] [Revised: 05/05/2014] [Accepted: 05/07/2014] [Indexed: 11/17/2022]
Abstract
The abomasal nematode Haemonchus contortus causes severe disease and production loss in small ruminants in warmer regions and is also an emerging threat in many temperate climates. Specific knowledge of the effects of climate on the epidemiology of H. contortus is needed to effectively apply sustainable control strategies, which rely on prediction of infection risk. Although the effects of temperature and rainfall on larval development in this species have been characterised, much less is known about migration out of faeces and onto herbage. This is an important deficit in our understanding of the epidemiology of haemonchosis in regions with relatively low and particularly erratic rainfall. Methods were developed to assess the migration of third stage larvae (L3) out of faeces under simulated rainfall in the laboratory. These were applied in a series of experiments, which showed that rainfall is required for migration. However, a single rainfall event was not sufficient for migration from faeces of which the crust has hardened after having been kept in dry conditions. Light and regular rainfall resulted in rapid emergence from moist faeces kept in humid conditions, but much slower emergence from dry faeces in dry conditions. Ambient relative humidity therefore appears to act through faecal moisture content to modify the effect of rainfall on larval migration. Larvae survived well in dry faeces for a number of days, but did not migrate in the absence of rainfall, so sheep faeces could potentially act as a larval reservoir in dry conditions, with peaks of infection following rainfall. Rates of faecal desiccation and rehydration on pasture could therefore be highly relevant to temporal patterns of larval availability.
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Affiliation(s)
- Tong Wang
- School of Biological Sciences, University of Bristol, Woodland Road, Bristol BS8 1UG, UK
| | - J A van Wyk
- Department of Veterinary Tropical Diseases, University of Pretoria, Private Bag X20, Hatfield, Pretoria 0028, South Africa
| | - A Morrison
- Moredun Research Institute, Pentlands Science Park, Bush Loan, Penicuik, Midlothian EH26 0PZ, UK
| | - E R Morgan
- School of Biological Sciences, University of Bristol, Woodland Road, Bristol BS8 1UG, UK; School of Veterinary Science, University of Bristol, Langford House, Langford, Somerset BS40 5DU, UK.
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Animal health aspects of adaptation to climate change: beating the heat and parasites in a warming Europe. Animal 2013; 7 Suppl 2:333-45. [PMID: 23739475 DOI: 10.1017/s175173111300075x] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Weather patterns in northern European regions have changed noticeably over the past several decades, featuring warmer, wetter weather with more extreme events. The climate is projected to continue on this trajectory for the foreseeable future, even under the most modest warming scenarios. Such changes will have a significant impact on livestock farming, both directly through effects on the animals themselves, and indirectly through changing exposure to pests and pathogens. Adaptation options aimed at taking advantage of new opportunities and/or minimising the risks of negative impacts will, in themselves, have implications for animal health and welfare. In this review, we consider the potential consequences of future intensification of animal production, challenges associated with indoor and outdoor rearing of animals and aspects of animal transportation as key examples. We investigate the direct and indirect effects of climate change on the epidemiology of important livestock pathogens, with a particular focus on parasitic infections, and the likely animal health consequences associated with selected adaptation options. Finally, we attempt to identify key gaps in our knowledge and suggest future research priorities.
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Carlsson AM, Irvine RJ, Wilson K, Coulson SJ. Adaptations to the Arctic: low-temperature development and cold tolerance in the free-living stages of a parasitic nematode from Svalbard. Polar Biol 2013. [DOI: 10.1007/s00300-013-1323-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Relevance of improved epidemiological knowledge to sustainable control of Haemonchus contortus in Nigeria. Anim Health Res Rev 2012; 13:196-208. [PMID: 23163980 DOI: 10.1017/s1466252312000163] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Nigeria experiences losses in small ruminant production as a result of a high prevalence of infection with Haemonchus contortus, but there have been very few investigative studies into the epidemiology of H. contortus in Nigeria, particularly in the south and western parts of the country. For successful planning and execution of control of hemonchosis in Nigeria, there is a need for insight into the epidemiology of free-living stages under the prevailing local conditions and models for climatic and environmental factors that control the risk of hemonchosis and distribution of H. contortus. In this review, we assess previous studies on the epidemiology of H. contortus in Nigeria, evaluate the present climatic and epidemiological situation, and highlight areas that require further investigative studies. The goal is to identify factors that underpin better control strategies and holistic integrated farm-management practice. Previous studies on H. contortus provided important information for formulation of control strategies and development toward integrated parasite management. However, this review has revealed the need for holistic evaluation of the current epidemiology and prevalence of H. contortus in Nigeria, particularly in relation to climate change. Accurate information is needed to build useful predictive models of the population dynamics of all free-living stages, particularly the L3.
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Khadijah S, Kahn LP, Walkden-Brown SW, Bailey JN, Bowers SF. Effect of simulated rainfall timing on faecal moisture and development of Haemonchus contortus and Trichostrongylus colubriformis eggs to infective larvae. Vet Parasitol 2012; 192:199-210. [PMID: 23142178 DOI: 10.1016/j.vetpar.2012.10.015] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2012] [Revised: 10/12/2012] [Accepted: 10/17/2012] [Indexed: 10/27/2022]
Abstract
Three climate-controlled chamber experiments were conducted to determine the effect of 32 mm simulated rainfall applied prior to (days -4 to -1) or after (days 0-7) faecal deposition and as a single (32 mm) or split (2 × 16 mm) application on faecal moisture (FM) and development of H. contortus and T. colubriformis to third stage infective larvae (L3). The timing of simulated rainfall regulated extra-pellet L3 recovery for H. contortus (P<0.05) but not T. colubriformis. Recovery of L3 was highest (P<0.05) when simulated rainfall was applied on the day of deposition followed by days -1, 1 and 2, which resulted in similar but lower development success rates. Recovery of intra-pellet T. colubriformis L3 was two-fold greater (P=0.008) than for H. contortus and was higher (P=0.007) following simulated rainfall on days 0 and 1 than on other days. There was a positive association between FM and total L3 recovery indicating the importance of FM in the period 48-72 h (H. contortus) and 72-96 h (T. colubriformis) after deposition. Simulated rainfall on the day prior to deposition was as effective in supporting total L3 recovery as application on days 1 or 2 and this effect could be predicted through FM. This highlights the importance of soil in transferring moisture to the faecal pellet. The importance of precedent rainfall and soil moisture in determining the development success of H. contortus and T. colubriformis, in addition to the general effects of the timing of simulated rainfall, need to be accommodated in grazing management programs to combat these species.
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Affiliation(s)
- S Khadijah
- Animal Science, School of Environmental and Rural Sciences, University of New England, Armidale, NSW 2351, Australia.
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Morgan E, van Dijk J. Climate and the epidemiology of gastrointestinal nematode infections of sheep in Europe. Vet Parasitol 2012; 189:8-14. [DOI: 10.1016/j.vetpar.2012.03.028] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Santos MC, Silva BF, Amarante AFT. Environmental factors influencing the transmission of Haemonchus contortus. Vet Parasitol 2012; 188:277-84. [PMID: 22521972 DOI: 10.1016/j.vetpar.2012.03.056] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2012] [Revised: 03/20/2012] [Accepted: 03/29/2012] [Indexed: 10/28/2022]
Abstract
Infection with the gastrointestinal nematode Haemonchus contortus causes considerable losses in the sheep industry. In this study, we evaluated the effect that climate has on third-stage larvae (L3) of H. contortus in terms of their migration from sheep feces to Brachiaria decumbens grass, as well as their distribution among the forage plants. Fecal samples containing H. contortus L3 was deposited on the soil among the herbage at an initial height of 30 cm. Sample collection began 24h after contamination and was performed on alternate days over 13 days. The L3 were recovered and quantified in three strata (heights) of grass (0-10 cm, 10-20 cm and >20 cm) as well as in the remaining feces and a superficial layer of soil, collected from beneath the feces. In order to obtain results under different environmental conditions, fecal samples containing H. contortus L3 were deposited on pasture in January (summer), in April (autumn), and July (winter). In all of the periods, the L3 were able to migrate from the feces to the herbage. However, rains, accompanied by high relative humidity and high temperatures, apparently favored migration. The highest L3 recovery rate in the pasture was in the summer observation period, which had the highest number of days with measurable precipitation, high relative humidity (>68.2%), and the highest temperatures at the soil level (minimum and maximum means of 19°C and 42°C, respectively). Under those conditions, larvae began to reach the upper stratum of the grass (>20 cm) by 24h after the deposition of fecal matter, the number of larvae having reached that stratum peaking at seven days after deposition. In the autumn observation period, there was no rainfall in the first five days post-contamination. During that period, high numbers of larvae were found in the fecal samples demonstrating that feces can act as a reservoir of larvae in the absence of rain. Except for two days in the summer observation period, when most of the L3 were recovered from the tops of blades of grass, L3 where located predominantly at the base of the herbage. In conclusion, rainfall favors the migration of L3 from feces to herbage. In addition, larval migration up and along blades of grass can occur relatively rapidly when the temperature is high.
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Affiliation(s)
- Michelle C Santos
- UNESP - Universidade Estadual Paulista, Departamento de Parasitologia, Instituto de Biociências, Caixa Postal 510, 18618-970 Botucatu, SP, Brazil
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Abstract
This paper examines the influence of water on the ecology of the eggs of Nematodirus battus, with a view to estimating the importance of including rainfall in mathematical models of parasite abundance. The literature suggests that, under pasture conditions, the availability of moisture is unlikely to be limiting for egg development, while eggs and infective larvae are highly resistant to desiccation. In the presented experiment, eggs that had been kept in salt sludges at 95% and 70% RH and were subsequently put at 15°C produced only a mildly accelerated, but not a mass, hatch, in the first few days after return to water. Eggs kept at higher osmotic pressures died. Mass hatching of infective larvae, described at pasture when spells of rain follow periods of drought, is unlikely to occur as the result of a sudden water influx into eggs. Since water is not necessary for migration of infective larvae from the soil on to grass, such peaks in larval abundance are more likely to arise from the effects of temperature on hatching of eggs.
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