Artificial infestation of Boophilus microplus in beef cattle heifers of four genetic groups.

Detalhes bibliográficos
Autor(a) principal: SILVA, A. M.
Data de Publicação: 2007
Outros Autores: ALENCAR, M. M. de, REGITANO, L. C. de A., OLIVEIRA, M. C. de S., BARIONI JUNIOR, W.
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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spelling 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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