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Registro Completo |
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Biblioteca(s): |
Embrapa Pecuária Sudeste. |
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Data corrente: |
15/10/2019 |
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Data da última atualização: |
10/08/2022 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
TOSCANO, J. H. B.; SANTOS, B. dos; HAEHLING, M. B. VON; GIRALDELO, L. A.; LOPES, L. G.; SILVA, M. H. da; FIGUEIREDO, A.; ESTEVES, S. N.; CHAGAS, A. C. de S. |
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Afiliação: |
JOÃO HENRIQUE BARBOSA TOSCANO, UNESP; ISABELLA BARBOSA DOS SANTOS, UNESP; MAREI BORSCH VON HAEHLING, UNESP; LUCIANA APARECIDA GIRALDELO, UNICEP; LOUYSE GABRIELLI LOPES, UNICEP; MATHEUS HENRIQUE DA SILVA, UNICEP; AMANDA FIGUEIREDO, UNESP; SERGIO NOVITA ESTEVES, CPPSE; ANA CAROLINA DE SOUZA CHAGAS, CPPSE. |
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Título: |
Morada Nova sheep breed: resistant or resilient to Haemonchus contortus infection? |
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Ano de publicação: |
2019 |
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Fonte/Imprenta: |
Veterinary Parasitology, v. 276, supplement, 2019, 100019. |
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Páginas: |
9 p. |
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DOI: |
https://doi.org/10.1016/j.vpoa.2019.100019 |
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Idioma: |
Inglês |
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Conteúdo: |
Morada Nova is a Brazilian hair sheep breed that is well adapted to the country?s mainly tropical climate and has good potential for meat and leather production. This breed is reported to be resistant to Haemonchus contortus infection, a highly desired characteristic due to the large impact of this parasite on sheep farming. Therefore, the present study aimed to characterize 287 recently weaned Morada Nova lambs and 123 ewes in relation to their resistance against H. contortus. The animals were dewormed and 15 days later artificially infected with 4000 H. contortus L3 (D0). They were individually monitored by periodic assessment of fecal egg count (FEC), packed cell volume (PCV), and live weight (LW). On D42, the sheep were again dewormed and submitted to a new parasitic challenge, following the same scheme. The animals of each category (lambs and ewes) were ranked according to individual mean FEC values, and classified as resistant (R, 20%), intermediate (I, 60%), or susceptible (S, 20%) to H. contortus infection. At weaning, high FEC were observed in all three phenotypes (P > 0.05). After the artificial infections, there was a significant difference (P < 0.05) among the three lamb phenotypes for the mean FEC (R < I < S), PCV (R > I > S), and LW (R = I > S). The infection levels (FEC) were negatively correlated with PCV (r = -0.66; P < 0.001), and LW (r = -0.30; P < 0.001). Despite this, the lambs were resilient, since more than 88% of these animals maintained the PCV above 24%, even when heavily infected. The importance of selective parasite control before weaning to reduce the negative impact on slaughter weight was evidenced, taking into account the high positive correlation between LW at weaning and final LW (r = 0.73; P < 0.001). The ewes, in turn, were strongly resistant to the parasite. Despite highly significant differences (P < 0.001) for mean FEC between phenotypes (R < I < S), 98% of the ewes maintained FEC below 4000 EPG. Their health was not affected, since PCV and LW did not differ between phenotypes, and these parameters were not significantly correlated with FEC (P > 0.05). With the phenotypic characterization performed here, it is possible to introduce procedures for parasite control in Morada Nova flocks, facilitating the target-selective treatment approach. The results of this study can also support improvement of meat production by the Morada Nova breed. MenosMorada Nova is a Brazilian hair sheep breed that is well adapted to the country?s mainly tropical climate and has good potential for meat and leather production. This breed is reported to be resistant to Haemonchus contortus infection, a highly desired characteristic due to the large impact of this parasite on sheep farming. Therefore, the present study aimed to characterize 287 recently weaned Morada Nova lambs and 123 ewes in relation to their resistance against H. contortus. The animals were dewormed and 15 days later artificially infected with 4000 H. contortus L3 (D0). They were individually monitored by periodic assessment of fecal egg count (FEC), packed cell volume (PCV), and live weight (LW). On D42, the sheep were again dewormed and submitted to a new parasitic challenge, following the same scheme. The animals of each category (lambs and ewes) were ranked according to individual mean FEC values, and classified as resistant (R, 20%), intermediate (I, 60%), or susceptible (S, 20%) to H. contortus infection. At weaning, high FEC were observed in all three phenotypes (P > 0.05). After the artificial infections, there was a significant difference (P < 0.05) among the three lamb phenotypes for the mean FEC (R < I < S), PCV (R > I > S), and LW (R = I > S). The infection levels (FEC) were negatively correlated with PCV (r = -0.66; P < 0.001), and LW (r = -0.30; P < 0.001). Despite this, the lambs were resilient, since more than 88% of these animals maintained the PCV above... Mostrar Tudo |
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Palavras-Chave: |
Artificial infection; Gastrointestinal nematode; Host resistance; Morada Nova breed; Parasite on sheep; Sheep farming; Sheep haemonchosis. |
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Thesagro: |
Ovino. |
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Thesaurus Nal: |
Animal parasites and pests; Sheep. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/202884/1/MoradaNovaSheep.pdf
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Marc: |
LEADER 03511naa a2200361 a 4500
001 2113103
005 2022-08-10
008 2019 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1016/j.vpoa.2019.100019$2DOI
100 1 $aTOSCANO, J. H. B.
245 $aMorada Nova sheep breed$bresistant or resilient to Haemonchus contortus infection?$h[electronic resource]
260 $c2019
300 $a9 p.
520 $aMorada Nova is a Brazilian hair sheep breed that is well adapted to the country?s mainly tropical climate and has good potential for meat and leather production. This breed is reported to be resistant to Haemonchus contortus infection, a highly desired characteristic due to the large impact of this parasite on sheep farming. Therefore, the present study aimed to characterize 287 recently weaned Morada Nova lambs and 123 ewes in relation to their resistance against H. contortus. The animals were dewormed and 15 days later artificially infected with 4000 H. contortus L3 (D0). They were individually monitored by periodic assessment of fecal egg count (FEC), packed cell volume (PCV), and live weight (LW). On D42, the sheep were again dewormed and submitted to a new parasitic challenge, following the same scheme. The animals of each category (lambs and ewes) were ranked according to individual mean FEC values, and classified as resistant (R, 20%), intermediate (I, 60%), or susceptible (S, 20%) to H. contortus infection. At weaning, high FEC were observed in all three phenotypes (P > 0.05). After the artificial infections, there was a significant difference (P < 0.05) among the three lamb phenotypes for the mean FEC (R < I < S), PCV (R > I > S), and LW (R = I > S). The infection levels (FEC) were negatively correlated with PCV (r = -0.66; P < 0.001), and LW (r = -0.30; P < 0.001). Despite this, the lambs were resilient, since more than 88% of these animals maintained the PCV above 24%, even when heavily infected. The importance of selective parasite control before weaning to reduce the negative impact on slaughter weight was evidenced, taking into account the high positive correlation between LW at weaning and final LW (r = 0.73; P < 0.001). The ewes, in turn, were strongly resistant to the parasite. Despite highly significant differences (P < 0.001) for mean FEC between phenotypes (R < I < S), 98% of the ewes maintained FEC below 4000 EPG. Their health was not affected, since PCV and LW did not differ between phenotypes, and these parameters were not significantly correlated with FEC (P > 0.05). With the phenotypic characterization performed here, it is possible to introduce procedures for parasite control in Morada Nova flocks, facilitating the target-selective treatment approach. The results of this study can also support improvement of meat production by the Morada Nova breed.
650 $aAnimal parasites and pests
650 $aSheep
650 $aOvino
653 $aArtificial infection
653 $aGastrointestinal nematode
653 $aHost resistance
653 $aMorada Nova breed
653 $aParasite on sheep
653 $aSheep farming
653 $aSheep haemonchosis
700 1 $aSANTOS, B. dos
700 1 $aHAEHLING, M. B. VON
700 1 $aGIRALDELO, L. A.
700 1 $aLOPES, L. G.
700 1 $aSILVA, M. H. da
700 1 $aFIGUEIREDO, A.
700 1 $aESTEVES, S. N.
700 1 $aCHAGAS, A. C. de S.
773 $tVeterinary Parasitology$gv. 276, supplement, 2019, 100019.
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Registro original: |
Embrapa Pecuária Sudeste (CPPSE) |
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| 9. |  | SIMPLICIO, A. A.; FOOTE, W. C.; RIERA, G. S. Frequency and ovulation rate in three native genotypes of goats under two feeding-management systems. In: INTERNATIONAL CONFERENCE ON GOATS, 4., 1987, Brasília, DF. Proceedings... Brasília, DF: EMBRAPA-DDT, 1987. v. 2, p. 1485. Abstract 259.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Caprinos e Ovinos. |
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| 15. | | FOOTE, W. C.; RIERA, G. S.; SIMPLICIO, A. A. Factors affecting reproduction. In: REUNIÃO TÉCNICO-CIENTÍFICA DO PROGRAMA DE APOIO À PESQUISA COLABORATIVA DE PEQUENOS RUMINANTES, 1., 1986, Sobral. Caprinos e ovinos no Nordeste do Brasil: anais. Sobral: EMBRAPA-CNPC: SR-CRSP, 1986. p. 371-384. (EMBRAPA-CNPC. Documentos, 6).| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Caprinos e Ovinos. |
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| Registros recuperados : 66 | |
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