Epidemiology of gastrointestinal nematode parasitism in Suffolk and Gulf Coast Native sheep with special emphasis on relative susceptibility to Haemonchus contortus infection
An eight-year study was conducted to define the epidemiology of gastrointestinal nematode infection in Suffolk and Gulf Coast Native (Native) breeds of sheep, and to determine if the Native sheep is more resistant to infection. For the initial three years, each breed grazed separate pastures where a...
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description | An eight-year study was conducted to define the epidemiology of gastrointestinal nematode infection in Suffolk and Gulf Coast Native (Native) breeds of sheep, and to determine if the Native sheep is more resistant to infection. For the initial three years, each breed grazed separate pastures where anthelmintic treatments were administered to individual animals on a salvage basis. For the last five years, both breeds grazed concurrently; anthelmintic treatments were administered to individual animals on a salvage basis for the first three years, and to all animals, when treatment criteria were met, for the last two years. The fecal egg count (FEC) and blood packed cell volume (PCV) were monitored, and tracer lamb nematode burdens were determined. Overall, FEC for both breeds increased in the spring (periparturient rise) for most years and in the summer for all years. Under separate grazing conditions, Native ewes and lambs had consistently lower infection levels than Suffolk ewes and lambs. During the haemonchosis season (June–September) each year, Suffolk ewe and lamb PCV decreased, and Native ewe and lamb PCV remained relatively stable. The salvage treatment protocol resulted in 27 treatments for Suffolk and one for Native ewes; similarly for lambs, 13 for Suffolk and zero for Native. Tracer lambs grazed with their respective breed, and the FEC and mean total nematode burden corresponded with the pattern of infection for their respective breed. The predominant nematodes found in Suffolk and Native tracer lambs were Haemonchus contortus and Trichostrongylus spp., respectively. Under concurrent grazing conditions, the same seasonal repeatable pattern of infection was present and was exhibited by both breeds, with the Native ewes and lambs being consistently and significantly (p ≤ 0.05) lower for FEC and higher for PCV. The salvage treatment protocol resulted in 57 and zero treatments for Suffolk and Native ewes, respectively; for lambs, 46 and 11. Tracer lamb nematode burdens again corresponded to their respective breed pattern of infection, with H. contortus and Trichostrongylus spp. being predominant in Suffolk and Native lambs, respectively. Data from all tracer lambs showed a relatively low level of hypobiosis (H. contortus only), and, although there was no consistent hypobiosis season, the tendency was for a higher level to occur in the fall. These results showed that the classic repeatable seasonal pattern of gastrointestinal nematode infection occurr |
doi_str_mv | 10.1016/S0304-4017(97)00094-0 |
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For the initial three years, each breed grazed separate pastures where anthelmintic treatments were administered to individual animals on a salvage basis. For the last five years, both breeds grazed concurrently; anthelmintic treatments were administered to individual animals on a salvage basis for the first three years, and to all animals, when treatment criteria were met, for the last two years. The fecal egg count (FEC) and blood packed cell volume (PCV) were monitored, and tracer lamb nematode burdens were determined. Overall, FEC for both breeds increased in the spring (periparturient rise) for most years and in the summer for all years. Under separate grazing conditions, Native ewes and lambs had consistently lower infection levels than Suffolk ewes and lambs. During the haemonchosis season (June–September) each year, Suffolk ewe and lamb PCV decreased, and Native ewe and lamb PCV remained relatively stable. The salvage treatment protocol resulted in 27 treatments for Suffolk and one for Native ewes; similarly for lambs, 13 for Suffolk and zero for Native. Tracer lambs grazed with their respective breed, and the FEC and mean total nematode burden corresponded with the pattern of infection for their respective breed. The predominant nematodes found in Suffolk and Native tracer lambs were Haemonchus contortus and Trichostrongylus spp., respectively. Under concurrent grazing conditions, the same seasonal repeatable pattern of infection was present and was exhibited by both breeds, with the Native ewes and lambs being consistently and significantly (p ≤ 0.05) lower for FEC and higher for PCV. The salvage treatment protocol resulted in 57 and zero treatments for Suffolk and Native ewes, respectively; for lambs, 46 and 11. Tracer lamb nematode burdens again corresponded to their respective breed pattern of infection, with H. contortus and Trichostrongylus spp. being predominant in Suffolk and Native lambs, respectively. Data from all tracer lambs showed a relatively low level of hypobiosis (H. contortus only), and, although there was no consistent hypobiosis season, the tendency was for a higher level to occur in the fall. These results showed that the classic repeatable seasonal pattern of gastrointestinal nematode infection occurred in both breeds of sheep, and that Native sheep were more resistant to infection (specifically H. contortus) than Suffolk sheep.</description><identifier>ISSN: 0304-4017</identifier><identifier>EISSN: 1873-2550</identifier><identifier>DOI: 10.1016/S0304-4017(97)00094-0</identifier><identifier>PMID: 9493310</identifier><language>eng</language><publisher>Netherlands: Elsevier B.V</publisher><subject>Animal Feed ; Animals ; Anthelmintics - therapeutic use ; Blood Volume ; Disease Susceptibility ; EPIDEMIOLOGIA ; EPIDEMIOLOGIE ; EPIDEMIOLOGY ; Female ; Gastrointestinal Diseases - epidemiology ; Gastrointestinal Diseases - parasitology ; Gastrointestinal Diseases - veterinary ; Haemonchiasis - epidemiology ; Haemonchiasis - immunology ; Haemonchiasis - veterinary ; Haemonchus - isolation & purification ; HAEMONCHUS CONTORTUS ; Immunity, Innate ; Incidence ; INFECCIONES POR NEMATODOS ; Louisiana - epidemiology ; Nematoda ; Nematoda - isolation & purification ; NEMATODE INFECTIONS ; Nematode Infections - epidemiology ; Nematode Infections - immunology ; Nematode Infections - veterinary ; NEMATODOSE ; OVIN ; OVINOS ; Parasite Egg Count ; PEST RESISTANCE ; Resistance ; RESISTANCE AUX ORGANISMES NUISIBLES ; RESISTENCIA A LAS PLAGAS ; Seasons ; SHEEP ; Sheep Diseases - epidemiology ; Species Specificity</subject><ispartof>Veterinary parasitology, 1998-01, Vol.74 (1), p.55-74</ispartof><rights>1998</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c434t-8ede38114934f544d334b2346aff98d1387e65a59384e01afab3bd6454353ade3</citedby><cites>FETCH-LOGICAL-c434t-8ede38114934f544d334b2346aff98d1387e65a59384e01afab3bd6454353ade3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/S0304-4017(97)00094-0$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,780,784,3550,27924,27925,45995</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/9493310$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Miller, J.E.</creatorcontrib><creatorcontrib>Bahirathan, M.</creatorcontrib><creatorcontrib>Lemarie, S.L.</creatorcontrib><creatorcontrib>Hembry, F.G.</creatorcontrib><creatorcontrib>Kearney, M.T.</creatorcontrib><creatorcontrib>Barras, S.R.</creatorcontrib><title>Epidemiology of gastrointestinal nematode parasitism in Suffolk and Gulf Coast Native sheep with special emphasis on relative susceptibility to Haemonchus contortus infection</title><title>Veterinary parasitology</title><addtitle>Vet Parasitol</addtitle><description>An eight-year study was conducted to define the epidemiology of gastrointestinal nematode infection in Suffolk and Gulf Coast Native (Native) breeds of sheep, and to determine if the Native sheep is more resistant to infection. For the initial three years, each breed grazed separate pastures where anthelmintic treatments were administered to individual animals on a salvage basis. For the last five years, both breeds grazed concurrently; anthelmintic treatments were administered to individual animals on a salvage basis for the first three years, and to all animals, when treatment criteria were met, for the last two years. The fecal egg count (FEC) and blood packed cell volume (PCV) were monitored, and tracer lamb nematode burdens were determined. Overall, FEC for both breeds increased in the spring (periparturient rise) for most years and in the summer for all years. Under separate grazing conditions, Native ewes and lambs had consistently lower infection levels than Suffolk ewes and lambs. During the haemonchosis season (June–September) each year, Suffolk ewe and lamb PCV decreased, and Native ewe and lamb PCV remained relatively stable. The salvage treatment protocol resulted in 27 treatments for Suffolk and one for Native ewes; similarly for lambs, 13 for Suffolk and zero for Native. Tracer lambs grazed with their respective breed, and the FEC and mean total nematode burden corresponded with the pattern of infection for their respective breed. The predominant nematodes found in Suffolk and Native tracer lambs were Haemonchus contortus and Trichostrongylus spp., respectively. Under concurrent grazing conditions, the same seasonal repeatable pattern of infection was present and was exhibited by both breeds, with the Native ewes and lambs being consistently and significantly (p ≤ 0.05) lower for FEC and higher for PCV. The salvage treatment protocol resulted in 57 and zero treatments for Suffolk and Native ewes, respectively; for lambs, 46 and 11. Tracer lamb nematode burdens again corresponded to their respective breed pattern of infection, with H. contortus and Trichostrongylus spp. being predominant in Suffolk and Native lambs, respectively. Data from all tracer lambs showed a relatively low level of hypobiosis (H. contortus only), and, although there was no consistent hypobiosis season, the tendency was for a higher level to occur in the fall. These results showed that the classic repeatable seasonal pattern of gastrointestinal nematode infection occurred in both breeds of sheep, and that Native sheep were more resistant to infection (specifically H. contortus) than Suffolk sheep.</description><subject>Animal Feed</subject><subject>Animals</subject><subject>Anthelmintics - therapeutic use</subject><subject>Blood Volume</subject><subject>Disease Susceptibility</subject><subject>EPIDEMIOLOGIA</subject><subject>EPIDEMIOLOGIE</subject><subject>EPIDEMIOLOGY</subject><subject>Female</subject><subject>Gastrointestinal Diseases - epidemiology</subject><subject>Gastrointestinal Diseases - parasitology</subject><subject>Gastrointestinal Diseases - veterinary</subject><subject>Haemonchiasis - epidemiology</subject><subject>Haemonchiasis - immunology</subject><subject>Haemonchiasis - veterinary</subject><subject>Haemonchus - isolation & purification</subject><subject>HAEMONCHUS CONTORTUS</subject><subject>Immunity, Innate</subject><subject>Incidence</subject><subject>INFECCIONES POR NEMATODOS</subject><subject>Louisiana - epidemiology</subject><subject>Nematoda</subject><subject>Nematoda - isolation & purification</subject><subject>NEMATODE INFECTIONS</subject><subject>Nematode Infections - epidemiology</subject><subject>Nematode Infections - immunology</subject><subject>Nematode Infections - veterinary</subject><subject>NEMATODOSE</subject><subject>OVIN</subject><subject>OVINOS</subject><subject>Parasite Egg Count</subject><subject>PEST RESISTANCE</subject><subject>Resistance</subject><subject>RESISTANCE AUX ORGANISMES NUISIBLES</subject><subject>RESISTENCIA A LAS PLAGAS</subject><subject>Seasons</subject><subject>SHEEP</subject><subject>Sheep Diseases - epidemiology</subject><subject>Species Specificity</subject><issn>0304-4017</issn><issn>1873-2550</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1998</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNqFUU1v1DAQtRCoLIWfUMknBIeAvXbi5ITQqrRIq3IonC0nHu8OJHawnVb7p_iNuN1VOXIaS-9jxu8RcsHZB8548_GWCSYrybh616n3jLFOVuwZWfFWiWpd1-w5WT1RXpJXKf0sJMkadUbOOtkJwdmK_Lmc0cKEYQy7Aw2O7kzKMaDPkDJ6M1IPk8nBAp1NNAkzpomip7eLc2H8RY239GoZHd2EoqQ3JuMd0LQHmOk95j1NMwxYfGCa90WfaPA0wnjiLWmAOWOPI-YDzYFeG5iCH_ZLokPwOcRcXugdDBmDf01eODMmeHOa5-THl8vvm-tq--3q6-bzthqkkLlqwYJoOS-_lK6W0goh-7WQjXGuay0XrYKmNnUnWgmMG2d60dtG1lLUwhTtOXl79J1j-L2UKPSE5dJxNB7CkrTqFG-YUoVYH4lDDClFcHqOOJl40Jzph570Y0_6oQTdKf3Yk2ZFd3FasPQT2CfVqZh_uDNBm13EpG-2vOtaVozEuuCfjjiUFO4Qok4Dgh_AYixRaRvwPxf8BZ9kr94</recordid><startdate>19980115</startdate><enddate>19980115</enddate><creator>Miller, J.E.</creator><creator>Bahirathan, M.</creator><creator>Lemarie, S.L.</creator><creator>Hembry, F.G.</creator><creator>Kearney, M.T.</creator><creator>Barras, S.R.</creator><general>Elsevier B.V</general><scope>FBQ</scope><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7X8</scope></search><sort><creationdate>19980115</creationdate><title>Epidemiology of gastrointestinal nematode parasitism in Suffolk and Gulf Coast Native sheep with special emphasis on relative susceptibility to Haemonchus contortus infection</title><author>Miller, J.E. ; Bahirathan, M. ; Lemarie, S.L. ; Hembry, F.G. ; Kearney, M.T. ; Barras, S.R.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c434t-8ede38114934f544d334b2346aff98d1387e65a59384e01afab3bd6454353ade3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1998</creationdate><topic>Animal Feed</topic><topic>Animals</topic><topic>Anthelmintics - therapeutic use</topic><topic>Blood Volume</topic><topic>Disease Susceptibility</topic><topic>EPIDEMIOLOGIA</topic><topic>EPIDEMIOLOGIE</topic><topic>EPIDEMIOLOGY</topic><topic>Female</topic><topic>Gastrointestinal Diseases - epidemiology</topic><topic>Gastrointestinal Diseases - parasitology</topic><topic>Gastrointestinal Diseases - veterinary</topic><topic>Haemonchiasis - epidemiology</topic><topic>Haemonchiasis - immunology</topic><topic>Haemonchiasis - veterinary</topic><topic>Haemonchus - isolation & purification</topic><topic>HAEMONCHUS CONTORTUS</topic><topic>Immunity, Innate</topic><topic>Incidence</topic><topic>INFECCIONES POR NEMATODOS</topic><topic>Louisiana - epidemiology</topic><topic>Nematoda</topic><topic>Nematoda - isolation & purification</topic><topic>NEMATODE INFECTIONS</topic><topic>Nematode Infections - epidemiology</topic><topic>Nematode Infections - immunology</topic><topic>Nematode Infections - veterinary</topic><topic>NEMATODOSE</topic><topic>OVIN</topic><topic>OVINOS</topic><topic>Parasite Egg Count</topic><topic>PEST RESISTANCE</topic><topic>Resistance</topic><topic>RESISTANCE AUX ORGANISMES NUISIBLES</topic><topic>RESISTENCIA A LAS PLAGAS</topic><topic>Seasons</topic><topic>SHEEP</topic><topic>Sheep Diseases - epidemiology</topic><topic>Species Specificity</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Miller, J.E.</creatorcontrib><creatorcontrib>Bahirathan, M.</creatorcontrib><creatorcontrib>Lemarie, S.L.</creatorcontrib><creatorcontrib>Hembry, F.G.</creatorcontrib><creatorcontrib>Kearney, M.T.</creatorcontrib><creatorcontrib>Barras, S.R.</creatorcontrib><collection>AGRIS</collection><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><jtitle>Veterinary parasitology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Miller, J.E.</au><au>Bahirathan, M.</au><au>Lemarie, S.L.</au><au>Hembry, F.G.</au><au>Kearney, M.T.</au><au>Barras, S.R.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Epidemiology of gastrointestinal nematode parasitism in Suffolk and Gulf Coast Native sheep with special emphasis on relative susceptibility to Haemonchus contortus infection</atitle><jtitle>Veterinary parasitology</jtitle><addtitle>Vet Parasitol</addtitle><date>1998-01-15</date><risdate>1998</risdate><volume>74</volume><issue>1</issue><spage>55</spage><epage>74</epage><pages>55-74</pages><issn>0304-4017</issn><eissn>1873-2550</eissn><abstract>An eight-year study was conducted to define the epidemiology of gastrointestinal nematode infection in Suffolk and Gulf Coast Native (Native) breeds of sheep, and to determine if the Native sheep is more resistant to infection. For the initial three years, each breed grazed separate pastures where anthelmintic treatments were administered to individual animals on a salvage basis. For the last five years, both breeds grazed concurrently; anthelmintic treatments were administered to individual animals on a salvage basis for the first three years, and to all animals, when treatment criteria were met, for the last two years. The fecal egg count (FEC) and blood packed cell volume (PCV) were monitored, and tracer lamb nematode burdens were determined. Overall, FEC for both breeds increased in the spring (periparturient rise) for most years and in the summer for all years. Under separate grazing conditions, Native ewes and lambs had consistently lower infection levels than Suffolk ewes and lambs. During the haemonchosis season (June–September) each year, Suffolk ewe and lamb PCV decreased, and Native ewe and lamb PCV remained relatively stable. The salvage treatment protocol resulted in 27 treatments for Suffolk and one for Native ewes; similarly for lambs, 13 for Suffolk and zero for Native. Tracer lambs grazed with their respective breed, and the FEC and mean total nematode burden corresponded with the pattern of infection for their respective breed. The predominant nematodes found in Suffolk and Native tracer lambs were Haemonchus contortus and Trichostrongylus spp., respectively. Under concurrent grazing conditions, the same seasonal repeatable pattern of infection was present and was exhibited by both breeds, with the Native ewes and lambs being consistently and significantly (p ≤ 0.05) lower for FEC and higher for PCV. The salvage treatment protocol resulted in 57 and zero treatments for Suffolk and Native ewes, respectively; for lambs, 46 and 11. Tracer lamb nematode burdens again corresponded to their respective breed pattern of infection, with H. contortus and Trichostrongylus spp. being predominant in Suffolk and Native lambs, respectively. Data from all tracer lambs showed a relatively low level of hypobiosis (H. contortus only), and, although there was no consistent hypobiosis season, the tendency was for a higher level to occur in the fall. These results showed that the classic repeatable seasonal pattern of gastrointestinal nematode infection occurred in both breeds of sheep, and that Native sheep were more resistant to infection (specifically H. contortus) than Suffolk sheep.</abstract><cop>Netherlands</cop><pub>Elsevier B.V</pub><pmid>9493310</pmid><doi>10.1016/S0304-4017(97)00094-0</doi><tpages>20</tpages></addata></record> |
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subjects | Animal Feed Animals Anthelmintics - therapeutic use Blood Volume Disease Susceptibility EPIDEMIOLOGIA EPIDEMIOLOGIE EPIDEMIOLOGY Female Gastrointestinal Diseases - epidemiology Gastrointestinal Diseases - parasitology Gastrointestinal Diseases - veterinary Haemonchiasis - epidemiology Haemonchiasis - immunology Haemonchiasis - veterinary Haemonchus - isolation & purification HAEMONCHUS CONTORTUS Immunity, Innate Incidence INFECCIONES POR NEMATODOS Louisiana - epidemiology Nematoda Nematoda - isolation & purification NEMATODE INFECTIONS Nematode Infections - epidemiology Nematode Infections - immunology Nematode Infections - veterinary NEMATODOSE OVIN OVINOS Parasite Egg Count PEST RESISTANCE Resistance RESISTANCE AUX ORGANISMES NUISIBLES RESISTENCIA A LAS PLAGAS Seasons SHEEP Sheep Diseases - epidemiology Species Specificity |
title | Epidemiology of gastrointestinal nematode parasitism in Suffolk and Gulf Coast Native sheep with special emphasis on relative susceptibility to Haemonchus contortus infection |
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