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Registro Completo |
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Biblioteca(s): |
Embrapa Pecuária Sudeste. |
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Data corrente: |
07/04/2026 |
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Data da última atualização: |
04/05/2026 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
BELLO, H. J. S.; COSTA, E. C. da; CUNHA, A. F. da; KAPRITCHKOFF, R. T. I.; CORRÊA, L. G. P.; NICIURA, S. C. M.; ESTEVES, S. N.; SANTOS, L. A. L. dos; MINHO, A. P.; CHAGAS, A. C. de S. |
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Afiliação: |
HORNBLENDA JOAQUINA SILVA BELLO, FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO; ESTEVÃO CAMILLO DA COSTA, CENTRO UNIVERSITÁRIO CENTRAL PAULISTA; AMANDA FREITAS DA CUNHA, CENTRO UNIVERSITÁRIO CENTRAL PAULISTA; RAFAELA TAMI IKEDA KAPRITCHKOFF, UNIVERSIDADE ESTADUAL PAULISTA JÚLIO DE MESQUITA FILHO; LORRANE GABRIELE PINHEIRO CORRÊA, UNIVERSIDADE ESTADUAL PAULISTA JÚLIO DE MESQUITA FILHO; SIMONE CRISTINA MEO NICIURA, CPPSE; SERGIO NOVITA ESTEVES, CPPSE; LEONARDO APARECIDO LIMA DOS SANTOS, UNIVERSIDADE ESTADUAL PAULISTA JÚLIO DE MESQUITA FILHO; ALESSANDRO PELEGRINE MINHO, CPPSE; ANA CAROLINA DE SOUZA CHAGAS, CPPSE. |
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Título: |
Monitoring the second generation of lambs after Haemonchus contortus replacement in ewes: effects of climate, sheep breed, and integrated control strategies in the tropics. |
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Ano de publicação: |
2026 |
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Fonte/Imprenta: |
Veterinary Parasitology: regional studies and reports, v. 71, 101481, 2026. |
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ISSN: |
2405-9390 |
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DOI: |
https://doi.org/10.1016/j.vprsr.2026.101481 |
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Idioma: |
Inglês |
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Notas: |
Financiamento: FAPESP-Embrapa | FAPESP (Projeto #2021/02535-5 e #2021/11830-0). |
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Conteúdo: |
Anthelmintic resistance in Haemonchus contortus compromises parasite control and productivity in tropical sheep production systems. This study monitored the second generation of lambs following the H. contortus replacement. A multidrug-resistant H. contortus population was replaced by a susceptible isolate in periparturient ewes of the White Dorper (DO), Santa Inês (SI), and Texel (TX) breeds. They were kept in a nematode-free paddock (TR, n = 60) or in a paddock naturally infested with resistant helminths (PR, n = 60), and compared with untreated ewes harbouring resistant helminths from natural infection and kept in a naturally infested paddock (C, n = 60). The 121 lambs born in the second breeding season were phenotyped every 21 days based on faecal egg count (FEC), packed cell volume (PCV), weight, FAMACHA© score, and body condition score. In the second birth season, the efficacy of anthelmintics was reduced to 40%, 86% and 89% for the C, PR, and TR groups, respectively, compared with 60%, 74%, and 98%, respectively, in the first birth season (n = 106). SI and TX lambs had lower (p = 0.008) FEC than DO. The PR and TR groups had higher weight gain (p < 0.001), higher PCV (p = 0.009), and twice the anthelmintic efficacy compared with C. Humidity affected (p = 0.016) the number of infective larvae recovered per kg of dry pasture matterL3/kg DM in pasture. These findings demonstrate that the beneficial effects of worm replacement in ewes on anthelmintic efficacy and animal performance were temporary, persisting into the second generation of lambs, but diminishing over time. The sustainability of this strategy depends on climatic conditions, sheep breed resistance, and integration with broader parasite control programs. MenosAnthelmintic resistance in Haemonchus contortus compromises parasite control and productivity in tropical sheep production systems. This study monitored the second generation of lambs following the H. contortus replacement. A multidrug-resistant H. contortus population was replaced by a susceptible isolate in periparturient ewes of the White Dorper (DO), Santa Inês (SI), and Texel (TX) breeds. They were kept in a nematode-free paddock (TR, n = 60) or in a paddock naturally infested with resistant helminths (PR, n = 60), and compared with untreated ewes harbouring resistant helminths from natural infection and kept in a naturally infested paddock (C, n = 60). The 121 lambs born in the second breeding season were phenotyped every 21 days based on faecal egg count (FEC), packed cell volume (PCV), weight, FAMACHA© score, and body condition score. In the second birth season, the efficacy of anthelmintics was reduced to 40%, 86% and 89% for the C, PR, and TR groups, respectively, compared with 60%, 74%, and 98%, respectively, in the first birth season (n = 106). SI and TX lambs had lower (p = 0.008) FEC than DO. The PR and TR groups had higher weight gain (p < 0.001), higher PCV (p = 0.009), and twice the anthelmintic efficacy compared with C. Humidity affected (p = 0.016) the number of infective larvae recovered per kg of dry pasture matterL3/kg DM in pasture. These findings demonstrate that the beneficial effects of worm replacement in ewes on anthelmintic efficacy and animal pe... Mostrar Tudo |
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Thesagro: |
Anti-Helmíntico; Controle Integrado; Cordeiro; Haemonchus Contortus; Nematóide; Ovelha; Resistência. |
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Thesaurus Nal: |
Anthelmintics; Ewes; Gastrointestinal nematodes; Haemonchus; Sheep. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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Marc: |
LEADER 03090naa a2200409 a 4500
001 2186113
005 2026-05-04
008 2026 bl uuuu u00u1 u #d
022 $a2405-9390
024 7 $ahttps://doi.org/10.1016/j.vprsr.2026.101481$2DOI
100 1 $aBELLO, H. J. S.
245 $aMonitoring the second generation of lambs after Haemonchus contortus replacement in ewes$beffects of climate, sheep breed, and integrated control strategies in the tropics.$h[electronic resource]
260 $c2026
500 $aFinanciamento: FAPESP-Embrapa | FAPESP (Projeto #2021/02535-5 e #2021/11830-0).
520 $aAnthelmintic resistance in Haemonchus contortus compromises parasite control and productivity in tropical sheep production systems. This study monitored the second generation of lambs following the H. contortus replacement. A multidrug-resistant H. contortus population was replaced by a susceptible isolate in periparturient ewes of the White Dorper (DO), Santa Inês (SI), and Texel (TX) breeds. They were kept in a nematode-free paddock (TR, n = 60) or in a paddock naturally infested with resistant helminths (PR, n = 60), and compared with untreated ewes harbouring resistant helminths from natural infection and kept in a naturally infested paddock (C, n = 60). The 121 lambs born in the second breeding season were phenotyped every 21 days based on faecal egg count (FEC), packed cell volume (PCV), weight, FAMACHA© score, and body condition score. In the second birth season, the efficacy of anthelmintics was reduced to 40%, 86% and 89% for the C, PR, and TR groups, respectively, compared with 60%, 74%, and 98%, respectively, in the first birth season (n = 106). SI and TX lambs had lower (p = 0.008) FEC than DO. The PR and TR groups had higher weight gain (p < 0.001), higher PCV (p = 0.009), and twice the anthelmintic efficacy compared with C. Humidity affected (p = 0.016) the number of infective larvae recovered per kg of dry pasture matterL3/kg DM in pasture. These findings demonstrate that the beneficial effects of worm replacement in ewes on anthelmintic efficacy and animal performance were temporary, persisting into the second generation of lambs, but diminishing over time. The sustainability of this strategy depends on climatic conditions, sheep breed resistance, and integration with broader parasite control programs.
650 $aAnthelmintics
650 $aEwes
650 $aGastrointestinal nematodes
650 $aHaemonchus
650 $aSheep
650 $aAnti-Helmíntico
650 $aControle Integrado
650 $aCordeiro
650 $aHaemonchus Contortus
650 $aNematóide
650 $aOvelha
650 $aResistência
700 1 $aCOSTA, E. C. da
700 1 $aCUNHA, A. F. da
700 1 $aKAPRITCHKOFF, R. T. I.
700 1 $aCORRÊA, L. G. P.
700 1 $aNICIURA, S. C. M.
700 1 $aESTEVES, S. N.
700 1 $aSANTOS, L. A. L. dos
700 1 $aMINHO, A. P.
700 1 $aCHAGAS, A. C. de S.
773 $tVeterinary Parasitology: regional studies and reports$gv. 71, 101481, 2026.
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Registro original: |
Embrapa Pecuária Sudeste (CPPSE) |
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| Registros recuperados : 98 | |
| 10. |  | OLIVEIRA, D. E.; MEDEIROS, S. R. de; LANNA, D. P. D. Nitrogen balance and excretion from grazing lactating cows supplemented with conjugated linoleic acid (CLA). In: ADSA-PSA-AMPA-ASAS JOINT ANNUAL MEETING, 2008, Indianapolis. Abstracts. Indianapolis: ADSA: ASAS, 2008. Disponível em:< http://adsa.asas.org/meetings/2008/abstracts/TOC.htm > Acesso em: 26 mar. 2009. Publicado em: Journal of Animal Science, Champaign, v. 86, E-Supplement 2; Journal of Dairy Science, Champaign, v. 91, E-Supplement 1. P. 487 1 CD-ROM. Ruminant Nutrition: proteins and amino acids - Dairy. O485. Trabalho TH253.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Gado de Corte. |
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| 12. | | MEDEIROS, S. R.; OLIVEIRA, D. E.; AROEIRA, L. J. M.; MCGUIRE, M.; LANNA, D. P. D. Supplementation of lactating cows grazing stargrass (Cynodon nlenfuensis var. nlenfuensis) with conjugated linoleic acid: effects on persistency and estimated net energy balance. In: INTERNATIONAL GRASSLAND CONGRESS, 19., 2001, São Pedro, SP. Grassland ecosystems: an outlook into the 21st century: proceedings. Piracicaba: Fealq: SBZ, 2001.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Gado de Leite. |
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| 13. | | LEME, P. R.; LANNA, D. P. D.; HENRIQUE, W.; ALLEONI, G. F.; BOIN, C. Substituição do milho pela polpa de citros em dietas de bovinos confinados. II. Composição química corporal e taxas de deposição. In: REUNIÃO ANUAL DA SOCIEDADE BRASILEIRA DE ZOOTECNIA, 34., 1997, Juiz de Fora, MG. Anais... Juiz de Fora: SBZ, 1997. p. 358-360. Titulo em inglês: Effect of substituing corn grain for pulp citrus on feeflot steers. II. Body chemical composition and accreation rates of body chemical components.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Gado de Corte. |
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| 14. | | CRUZ, G. M. da; TULLIO, R. R.; ALLEONI, G. F.; BERNDT, A.; ALENCAR, M. M. de; LANNA, D. P. D. Ganho de peso e conversão alimentar de bovino jovem não-cadastrado de quatro grupos genéticos em confinamento em relação ao status nutricional na fase de pastejo. In: REUNIÃO ANUAL DA SOCIEDADE BRASILEIRA DE ZOOTECNIA, 40., 2003, Santa Maria, RS. Anais... Santa Maria: SBZ, 2003. 1 CD-ROM. 5f. 5p.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Pecuária Sudeste. |
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| 15. | | CRUZ, G. M.; TULLIO. R. M.; BERNDT, A.; LANNA, D. P. D.; ALENCAR, M. M. de; ALLEONI, G. F. Rendimento de cortes cárneos de bovinos não-castrados, de diferentes grupos genéticos, terminados em confinamento, após receberem dois níveis de suplementação em pastagem. In: REUNIÃO ANUAL DA SOCIEDADE BRASILEIRA DE ZOOTECNIA, 42., 2005, Goiânia. A Produção animal e o foco no agronegócio: anais. Goiânia: SBZ, 2005. 1 CD-ROM.| Biblioteca(s): Embrapa Pecuária Sudeste. |
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| 16. | | CHAVES, A. S.; NASCIMENTO, M. L. do; TULLIO, R. R.; BERNDT, A.; ALENCAR, M. M. de; LANNA, D. P. D. Qualidade de carne de bovinos Nelore em função do consumo alimentar residual. In: REUNIÃO ANUAL DA SOCIEDADE BRASILEIRA DE ZOOTECNIA, 49., Brasília, DF. A produção animal no mundo em transformação: Anais. Brasília: SBZ, 2012.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Pecuária Sudeste. |
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| 17. | | OLIVEIRA, D. E.; MEDEIROS, S. R.; AROEIRA, L. J. M.; BARIONI, L. G.; LANNA, D. P. D. Estimating herbage mass in stargrass (Cynodon nlenfuensis var. nlenfuensis) using sward surface height and the rising plate meter. In: INTERNATIONAL GRASSLAND CONGRESS, 19., 2001, São Pedro, SP. Grassland ecosystems: an outlook into the 21st century: proceedings. Piracicaba: Fealq: SBZ, 2001.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Gado de Leite. |
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| Registros recuperados : 98 | |
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