Artificial infestation of Boophilus microplus in beef cattle heifers of four genetic groups.
Autor(a) principal: | |
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Data de Publicação: | 2007 |
Outros Autores: | , , , |
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/38036 https://doi.org/10.1590/S1415-47572007000600020 |
Resumo: | Resistance of beef cattle heifers to the cattle tick Boophilus microplus was evaluated by artificial infestation of 66 beef cattle heifers of the following genetic groups: 16 Nelore (NE), 18 Canchim x Nelore (CN), 16 Angus x Nelore (AN) and 16 Simmental x Nelore (SN). The animals, with a mean age of 16.5 months, were maintained with no chemical tick control in a Brachiaria decumbens pasture. Four artificial infestations with 20,000 B. microplus larvae were carried out 14 days apart and from day 18 to day 22 of each infestation the number of engorged female ticks (> 4.5 mm) was counted on the left side of each heifer. Data were analyzed as the percentage of return (PR = percentage of ticks counted relative to the number infested), transformed to (PR)¼, and as log10 (Cij + 1), in which Cij is the number of ticks in each infestation, using the least squares method with a model that included the effects of genetic group (GG), animal within GG (error a), infestation number (I), GG x I and the residual (error b). Results indicated a significant GG x I interaction, because AN and SN heifers had a higher percentage of return than CN and NE heifers, while CN heifers showed a higher percentage of return than the NE heifers only in infestations 3 and 4. Transformed percentages of return were NE = 0.35 ± 0.06, AN = 0.89 ± 0.06, CN = 0.54 ± 0.05 and SN = 0.85 ± 0.06. |
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Artificial infestation of Boophilus microplus in beef cattle heifers of four genetic groups.Tick resistanceCarrapatoCruzamentoGado de CorteResistênciaBeef cattleCrossbredsResistance of beef cattle heifers to the cattle tick Boophilus microplus was evaluated by artificial infestation of 66 beef cattle heifers of the following genetic groups: 16 Nelore (NE), 18 Canchim x Nelore (CN), 16 Angus x Nelore (AN) and 16 Simmental x Nelore (SN). The animals, with a mean age of 16.5 months, were maintained with no chemical tick control in a Brachiaria decumbens pasture. Four artificial infestations with 20,000 B. microplus larvae were carried out 14 days apart and from day 18 to day 22 of each infestation the number of engorged female ticks (> 4.5 mm) was counted on the left side of each heifer. Data were analyzed as the percentage of return (PR = percentage of ticks counted relative to the number infested), transformed to (PR)¼, and as log10 (Cij + 1), in which Cij is the number of ticks in each infestation, using the least squares method with a model that included the effects of genetic group (GG), animal within GG (error a), infestation number (I), GG x I and the residual (error b). Results indicated a significant GG x I interaction, because AN and SN heifers had a higher percentage of return than CN and NE heifers, while CN heifers showed a higher percentage of return than the NE heifers only in infestations 3 and 4. Transformed percentages of return were NE = 0.35 ± 0.06, AN = 0.89 ± 0.06, CN = 0.54 ± 0.05 and SN = 0.85 ± 0.06.ANA MARY DA SILVA, UFSCAR; MAURICIO MELLO DE ALENCAR, CPPSE; LUCIANA CORREIA DE ALMEIDA REGITANO, CPPSE; MARCIA CRISTINA DE SENA OLIVEIRA, CPPSE; WALDOMIRO BARIONI JUNIOR, CPPSE.SILVA, A. M.ALENCAR, M. M. deREGITANO, L. C. de A.OLIVEIRA, M. C. de S.BARIONI JUNIOR, W.2023-02-27T13:57:21Z2023-02-27T13:57:21Z2008-03-132007info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleGenetics and Molecular Biology, v. 30, n. 4, p. 1150- 1155, 2007.http://www.alice.cnptia.embrapa.br/alice/handle/doc/38036https://doi.org/10.1590/S1415-47572007000600020enginfo: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:EMBRAPA2023-02-27T13:57:21Zoai:www.alice.cnptia.embrapa.br:doc/38036Repositório InstitucionalPUBhttps://www.alice.cnptia.embrapa.br/oai/requestopendoar:21542023-02-27T13:57:21falseRepositório InstitucionalPUBhttps://www.alice.cnptia.embrapa.br/oai/requestcg-riaa@embrapa.bropendoar:21542023-02-27T13:57:21Repositório 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 |
Artificial infestation of Boophilus microplus in beef cattle heifers of four genetic groups. |
title |
Artificial infestation of Boophilus microplus in beef cattle heifers of four genetic groups. |
spellingShingle |
Artificial infestation of Boophilus microplus in beef cattle heifers of four genetic groups. SILVA, A. M. Tick resistance Carrapato Cruzamento Gado de Corte Resistência Beef cattle Crossbreds |
title_short |
Artificial infestation of Boophilus microplus in beef cattle heifers of four genetic groups. |
title_full |
Artificial infestation of Boophilus microplus in beef cattle heifers of four genetic groups. |
title_fullStr |
Artificial infestation of Boophilus microplus in beef cattle heifers of four genetic groups. |
title_full_unstemmed |
Artificial infestation of Boophilus microplus in beef cattle heifers of four genetic groups. |
title_sort |
Artificial infestation of Boophilus microplus in beef cattle heifers of four genetic groups. |
author |
SILVA, A. M. |
author_facet |
SILVA, A. M. ALENCAR, M. M. de REGITANO, L. C. de A. OLIVEIRA, M. C. de S. BARIONI JUNIOR, W. |
author_role |
author |
author2 |
ALENCAR, M. M. de REGITANO, L. C. de A. OLIVEIRA, M. C. de S. BARIONI JUNIOR, W. |
author2_role |
author author author author |
dc.contributor.none.fl_str_mv |
ANA MARY DA SILVA, UFSCAR; MAURICIO MELLO DE ALENCAR, CPPSE; LUCIANA CORREIA DE ALMEIDA REGITANO, CPPSE; MARCIA CRISTINA DE SENA OLIVEIRA, CPPSE; WALDOMIRO BARIONI JUNIOR, CPPSE. |
dc.contributor.author.fl_str_mv |
SILVA, A. M. ALENCAR, M. M. de REGITANO, L. C. de A. OLIVEIRA, M. C. de S. BARIONI JUNIOR, W. |
dc.subject.por.fl_str_mv |
Tick resistance Carrapato Cruzamento Gado de Corte Resistência Beef cattle Crossbreds |
topic |
Tick resistance Carrapato Cruzamento Gado de Corte Resistência Beef cattle Crossbreds |
description |
Resistance of beef cattle heifers to the cattle tick Boophilus microplus was evaluated by artificial infestation of 66 beef cattle heifers of the following genetic groups: 16 Nelore (NE), 18 Canchim x Nelore (CN), 16 Angus x Nelore (AN) and 16 Simmental x Nelore (SN). The animals, with a mean age of 16.5 months, were maintained with no chemical tick control in a Brachiaria decumbens pasture. Four artificial infestations with 20,000 B. microplus larvae were carried out 14 days apart and from day 18 to day 22 of each infestation the number of engorged female ticks (> 4.5 mm) was counted on the left side of each heifer. Data were analyzed as the percentage of return (PR = percentage of ticks counted relative to the number infested), transformed to (PR)¼, and as log10 (Cij + 1), in which Cij is the number of ticks in each infestation, using the least squares method with a model that included the effects of genetic group (GG), animal within GG (error a), infestation number (I), GG x I and the residual (error b). Results indicated a significant GG x I interaction, because AN and SN heifers had a higher percentage of return than CN and NE heifers, while CN heifers showed a higher percentage of return than the NE heifers only in infestations 3 and 4. Transformed percentages of return were NE = 0.35 ± 0.06, AN = 0.89 ± 0.06, CN = 0.54 ± 0.05 and SN = 0.85 ± 0.06. |
publishDate |
2007 |
dc.date.none.fl_str_mv |
2007 2008-03-13 2023-02-27T13:57:21Z 2023-02-27T13:57:21Z |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/publishedVersion info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
Genetics and Molecular Biology, v. 30, n. 4, p. 1150- 1155, 2007. http://www.alice.cnptia.embrapa.br/alice/handle/doc/38036 https://doi.org/10.1590/S1415-47572007000600020 |
identifier_str_mv |
Genetics and Molecular Biology, v. 30, n. 4, p. 1150- 1155, 2007. |
url |
http://www.alice.cnptia.embrapa.br/alice/handle/doc/38036 https://doi.org/10.1590/S1415-47572007000600020 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
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 |
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1794503540618559488 |