Morada Nova sheep breed: resistant or resilient to Haemonchus contortus infection?

Detalhes bibliográficos
Autor(a) principal: TOSCANO, J. H. B.
Data de Publicação: 2019
Outros Autores: 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.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
Texto Completo: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1113103
https://doi.org/10.1016/j.vpoa.2019.100019
Resumo: 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.
id EMBR_a185630bc1b2c3c41e5ca4c11d711269
oai_identifier_str oai:www.alice.cnptia.embrapa.br:doc/1113103
network_acronym_str EMBR
network_name_str Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
repository_id_str 2154
spelling Morada Nova sheep breed: resistant or resilient to Haemonchus contortus infection?Artificial infectionHost resistanceMorada Nova breedSheep haemonchosisParasite on sheepSheep farmingGastrointestinal nematodeOvinoSheepAnimal parasites and pestsMorada 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.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.TOSCANO, J. H. B.SANTOS, B. dosHAEHLING, M. B. VONGIRALDELO, L. A.LOPES, L. G.SILVA, M. H. daFIGUEIREDO, A.ESTEVES, S. N.CHAGAS, A. C. de S.2022-08-11T10:19:28Z2022-08-11T10:19:28Z2019-10-152019info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article9 p.Veterinary Parasitology, v. 276, supplement, 2019, 100019.http://www.alice.cnptia.embrapa.br/alice/handle/doc/1113103https://doi.org/10.1016/j.vpoa.2019.100019Inglesenginfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)instacron:EMBRAPA2022-08-11T10:19:36Zoai:www.alice.cnptia.embrapa.br:doc/1113103Repositório InstitucionalPUBhttps://www.alice.cnptia.embrapa.br/oai/requestcg-riaa@embrapa.bropendoar:21542022-08-11T10:19:36Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)false
dc.title.none.fl_str_mv Morada Nova sheep breed: resistant or resilient to Haemonchus contortus infection?
title Morada Nova sheep breed: resistant or resilient to Haemonchus contortus infection?
spellingShingle Morada Nova sheep breed: resistant or resilient to Haemonchus contortus infection?
TOSCANO, J. H. B.
Artificial infection
Host resistance
Morada Nova breed
Sheep haemonchosis
Parasite on sheep
Sheep farming
Gastrointestinal nematode
Ovino
Sheep
Animal parasites and pests
title_short Morada Nova sheep breed: resistant or resilient to Haemonchus contortus infection?
title_full Morada Nova sheep breed: resistant or resilient to Haemonchus contortus infection?
title_fullStr Morada Nova sheep breed: resistant or resilient to Haemonchus contortus infection?
title_full_unstemmed Morada Nova sheep breed: resistant or resilient to Haemonchus contortus infection?
title_sort Morada Nova sheep breed: resistant or resilient to Haemonchus contortus infection?
author TOSCANO, J. H. B.
author_facet 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.
author_role author
author2 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.
author2_role author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv 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.
dc.contributor.author.fl_str_mv 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.
dc.subject.por.fl_str_mv Artificial infection
Host resistance
Morada Nova breed
Sheep haemonchosis
Parasite on sheep
Sheep farming
Gastrointestinal nematode
Ovino
Sheep
Animal parasites and pests
topic Artificial infection
Host resistance
Morada Nova breed
Sheep haemonchosis
Parasite on sheep
Sheep farming
Gastrointestinal nematode
Ovino
Sheep
Animal parasites and pests
description 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.
publishDate 2019
dc.date.none.fl_str_mv 2019-10-15
2019
2022-08-11T10:19:28Z
2022-08-11T10:19:28Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv Veterinary Parasitology, v. 276, supplement, 2019, 100019.
http://www.alice.cnptia.embrapa.br/alice/handle/doc/1113103
https://doi.org/10.1016/j.vpoa.2019.100019
identifier_str_mv Veterinary Parasitology, v. 276, supplement, 2019, 100019.
url http://www.alice.cnptia.embrapa.br/alice/handle/doc/1113103
https://doi.org/10.1016/j.vpoa.2019.100019
dc.language.iso.fl_str_mv Ingles
eng
language_invalid_str_mv Ingles
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 9 p.
dc.source.none.fl_str_mv reponame:Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
instacron:EMBRAPA
instname_str Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
instacron_str EMBRAPA
institution EMBRAPA
reponame_str Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
collection Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
repository.name.fl_str_mv Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
repository.mail.fl_str_mv cg-riaa@embrapa.br
_version_ 1791512988533915648