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Registro Completo |
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Biblioteca(s): |
Embrapa Pantanal. |
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Data corrente: |
07/12/2004 |
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Data da última atualização: |
27/03/2017 |
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Autoria: |
JENSEN, K. M. V.; JESPERSEN, J. B.; BIRKETT, M. A.; PICKETT, J. A; THOMAS, G.; WADHAMS, L. J.; WOODCOCK, C. M. |
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Afiliação: |
Institute of Agricultural Sciences (Denmark); Biological Chemistry Division (Harpenden, U.K); Laboratory for Behavioural Physiology, Institute for Animal Health (Netherlands). |
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Título: |
Variation in the load of the horn fly, Haematobia irritans, in cattle herds is determined by the presence or absence of individual heifers. |
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Ano de publicação: |
2004 |
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Fonte/Imprenta: |
Medical and Veterinary Entomology, v.18, n.3, p.275-280, 2004. |
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Idioma: |
Inglês |
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Conteúdo: |
The distribution of horn flies, Haematobia irritans (L.) (Diptera: Muscidae), in herds of Danish Holstein-Friesian cattle was investigated in two studies conducted during two field seasons. In the first study, highly significant differences in fly distribution between the most and the least fly-susceptible heifers were observed. In one herd, the mean difference between the most fly-susceptible and the most fly-resistant heifers was 268 Ha. irritans speciments. The highest ratio between upper and lower mean fly number was 64.1:1, whereas the lowest was 3.1:1. In the second year, it was demonstrated that the heifers kept their rank in fly attraction over time. The trial clearly demonstrated that some heifers were attracting flies, whereas others, even in the same herd, only carried a few. In the second study, heifers were moved in and out of herds in an attempt to manipulate fly loads in the herds. In year I, one herd (herd A) received four fly-resistant heifers from another herd (herd B), resulting in a drop in the mean number of flies, whereas herd B received four fly-susceptible heifers from herd A, resulting in an elevation of the mean number of flies. In year 2, a similar pattern emerged usingherds C and D, and when the cattle were later returned to their original herds, the fly loads returned to their original distribution. The data presented here show unequivocally that, for horn flies, there can be considerable differences in fly loads for individual heifers within the Holstein-Friesian breed. Furthermore, the overall fly load within herds can be manipulated, and can be reversed. Thus, the distribution in the number of flies within a herd appears to depend on the number of fly resistant or fly-susceptible heifers. The possible role of chemical factors emitted by heifers, i. e. volatile semiochemicals, in determining differences in fly loads is discussed, whereby attractants are emitted by fly-susceptible heifers and enable fies to locate their host, and repellents are emitted by fly-resistant heifers such that the flies are actively repelled from the herd. MenosThe distribution of horn flies, Haematobia irritans (L.) (Diptera: Muscidae), in herds of Danish Holstein-Friesian cattle was investigated in two studies conducted during two field seasons. In the first study, highly significant differences in fly distribution between the most and the least fly-susceptible heifers were observed. In one herd, the mean difference between the most fly-susceptible and the most fly-resistant heifers was 268 Ha. irritans speciments. The highest ratio between upper and lower mean fly number was 64.1:1, whereas the lowest was 3.1:1. In the second year, it was demonstrated that the heifers kept their rank in fly attraction over time. The trial clearly demonstrated that some heifers were attracting flies, whereas others, even in the same herd, only carried a few. In the second study, heifers were moved in and out of herds in an attempt to manipulate fly loads in the herds. In year I, one herd (herd A) received four fly-resistant heifers from another herd (herd B), resulting in a drop in the mean number of flies, whereas herd B received four fly-susceptible heifers from herd A, resulting in an elevation of the mean number of flies. In year 2, a similar pattern emerged usingherds C and D, and when the cattle were later returned to their original herds, the fly loads returned to their original distribution. The data presented here show unequivocally that, for horn flies, there can be considerable differences in fly loads for individual heifers within the... Mostrar Tudo |
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Palavras-Chave: |
Dinamarca; Distribuição; Distribution; Horn fly; Mosca de chifre; Ranking; Semiochemical; Substância química. |
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Thesagro: |
Gado; Haematobia Irritans. |
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Thesaurus Nal: |
cattle; Denmark. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 03048naa a2200337 a 4500
001 1811390
005 2017-03-27
008 2004 bl --- 0-- u #d
100 1 $aJENSEN, K. M. V.
245 $aVariation in the load of the horn fly, Haematobia irritans, in cattle herds is determined by the presence or absence of individual heifers.
260 $c2004
520 $aThe distribution of horn flies, Haematobia irritans (L.) (Diptera: Muscidae), in herds of Danish Holstein-Friesian cattle was investigated in two studies conducted during two field seasons. In the first study, highly significant differences in fly distribution between the most and the least fly-susceptible heifers were observed. In one herd, the mean difference between the most fly-susceptible and the most fly-resistant heifers was 268 Ha. irritans speciments. The highest ratio between upper and lower mean fly number was 64.1:1, whereas the lowest was 3.1:1. In the second year, it was demonstrated that the heifers kept their rank in fly attraction over time. The trial clearly demonstrated that some heifers were attracting flies, whereas others, even in the same herd, only carried a few. In the second study, heifers were moved in and out of herds in an attempt to manipulate fly loads in the herds. In year I, one herd (herd A) received four fly-resistant heifers from another herd (herd B), resulting in a drop in the mean number of flies, whereas herd B received four fly-susceptible heifers from herd A, resulting in an elevation of the mean number of flies. In year 2, a similar pattern emerged usingherds C and D, and when the cattle were later returned to their original herds, the fly loads returned to their original distribution. The data presented here show unequivocally that, for horn flies, there can be considerable differences in fly loads for individual heifers within the Holstein-Friesian breed. Furthermore, the overall fly load within herds can be manipulated, and can be reversed. Thus, the distribution in the number of flies within a herd appears to depend on the number of fly resistant or fly-susceptible heifers. The possible role of chemical factors emitted by heifers, i. e. volatile semiochemicals, in determining differences in fly loads is discussed, whereby attractants are emitted by fly-susceptible heifers and enable fies to locate their host, and repellents are emitted by fly-resistant heifers such that the flies are actively repelled from the herd.
650 $acattle
650 $aDenmark
650 $aGado
650 $aHaematobia Irritans
653 $aDinamarca
653 $aDistribuição
653 $aDistribution
653 $aHorn fly
653 $aMosca de chifre
653 $aRanking
653 $aSemiochemical
653 $aSubstância química
700 1 $aJESPERSEN, J. B.
700 1 $aBIRKETT, M. A.
700 1 $aPICKETT, J. A
700 1 $aTHOMAS, G.
700 1 $aWADHAMS, L. J.
700 1 $aWOODCOCK, C. M.
773 $tMedical and Veterinary Entomology$gv.18, n.3, p.275-280, 2004.
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Registro original: |
Embrapa Pantanal (CPAP) |
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Registro |
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Registro Completo
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Biblioteca(s): |
Embrapa Semiárido. |
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Data corrente: |
24/05/2007 |
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Data da última atualização: |
28/08/2019 |
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Tipo da produção científica: |
Artigo em Anais de Congresso / Nota Técnica |
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Autoria: |
MOURA, M. S. B. de; SILVA, B. B. da; AZEVEDO, P. V. de. |
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Afiliação: |
MAGNA SOELMA BESERRA DE MOURA, CPATSA. |
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Título: |
Avaliação da fração evaporativa para conversão de medidas instantâneas em valores diários de evapotranspiração. |
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Ano de publicação: |
2002 |
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Fonte/Imprenta: |
In: CONGRESSO BRASILEIRO DE METEOROLOGIA, 12., 2002, Foz de Iguaçu. Anais... Foz de Iguaçu: SBMET, 2002. |
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Descrição Física: |
1 CD-ROM. |
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Idioma: |
Português |
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Conteúdo: |
Tendo em vista o crescente uso das técnicas de sensoriamento remoto para obtenção das necessidadeshídricas de perímetros irrigados, esta pesquisa objetivou determinar a fração evaporativa sobre um pomar degoiabeira irrigada no Sub-médio São Francisco, a fim de subsidiar a conversão de determinações instantâneas deevapotranspiração em totais diários. |
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Palavras-Chave: |
Avaliação; Fração evaporativa; Submédio São Francisco. |
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Thesagro: |
Evapotranspiração; Goiaba; Pomar. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/CPATSA/35292/1/OPB1266.pdf
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Marc: |
LEADER 01079nam a2200217 a 4500
001 1152448
005 2019-08-28
008 2002 bl uuuu u00u1 u #d
100 1 $aMOURA, M. S. B. de
245 $aAvaliação da fração evaporativa para conversão de medidas instantâneas em valores diários de evapotranspiração.
260 $aIn: CONGRESSO BRASILEIRO DE METEOROLOGIA, 12., 2002, Foz de Iguaçu. Anais... Foz de Iguaçu: SBMET$c2002
300 $c1 CD-ROM.
520 $aTendo em vista o crescente uso das técnicas de sensoriamento remoto para obtenção das necessidadeshídricas de perímetros irrigados, esta pesquisa objetivou determinar a fração evaporativa sobre um pomar degoiabeira irrigada no Sub-médio São Francisco, a fim de subsidiar a conversão de determinações instantâneas deevapotranspiração em totais diários.
650 $aEvapotranspiração
650 $aGoiaba
650 $aPomar
653 $aAvaliação
653 $aFração evaporativa
653 $aSubmédio São Francisco
700 1 $aSILVA, B. B. da
700 1 $aAZEVEDO, P. V. de
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Embrapa Semiárido (CPATSA) |
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