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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
12/04/2000 |
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Data da última atualização: |
11/12/2023 |
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Autoria: |
CHARTIER, C.; HOSTE, H. |
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Título: |
Response to challenge infection with Haemonchus contortus and Trichostrongylus colubriformis in dairy goats differences between high and low-producers. |
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Ano de publicação: |
1997 |
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Fonte/Imprenta: |
Veterinary Parasitology, v. 73, n. 3/4, p. 267-276, 1997. |
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DOI: |
https://doi.org/10.1016/S0304-4017(97)00131-3 |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: The objective of the study was to analyse the influence of the level of milk production in dairy goats on the ability to develop resistance to gastrointestinal nematode infection. Two groups of 50 goats were initially exposed (Group ‘Previously Infected’ PI) or not exposed (Group ‘Not Previously Infected’ NPI) to repeated infections with a mixture of Haemonchus contortus and Trichostrongylus colubriformis. After anthelmintic treatment, goats from both groups remained free of parasites for 2 months around kidding. One month after kidding, 24 lactating goats in each group were challenged with Haemonchus contortus and Trichostrongylus colubriformis. Parasitological, pathophysiological and milk production parameters were then examined fortnightly for 3 months following challenge. Within the PI and NPI group, the response to challenge was compared between the 25% goats exhibiting the lowest level of milk production and the 25% with the highest level of production. In the low producers, previous contact with the parasites was associated with a decrease in egg excretion which was not apparent in the high producers. Previous exposure to parasites was also associated with more severe pathophysiological disturbances in the high producers. Lastly, the response to challenge also induced more severe depression in milk production after previous infection in the animals with the highest productive potential. These results confirmed that the level of milk production in dairy goats could influence the resistance and/or resilience to parasitism with more severe consequences detected in the high producers. In addition, the results suggest that such differences could in fact be mainly related to differences in the host response to parasites. MenosAbstract: The objective of the study was to analyse the influence of the level of milk production in dairy goats on the ability to develop resistance to gastrointestinal nematode infection. Two groups of 50 goats were initially exposed (Group ‘Previously Infected’ PI) or not exposed (Group ‘Not Previously Infected’ NPI) to repeated infections with a mixture of Haemonchus contortus and Trichostrongylus colubriformis. After anthelmintic treatment, goats from both groups remained free of parasites for 2 months around kidding. One month after kidding, 24 lactating goats in each group were challenged with Haemonchus contortus and Trichostrongylus colubriformis. Parasitological, pathophysiological and milk production parameters were then examined fortnightly for 3 months following challenge. Within the PI and NPI group, the response to challenge was compared between the 25% goats exhibiting the lowest level of milk production and the 25% with the highest level of production. In the low producers, previous contact with the parasites was associated with a decrease in egg excretion which was not apparent in the high producers. Previous exposure to parasites was also associated with more severe pathophysiological disturbances in the high producers. Lastly, the response to challenge also induced more severe depression in milk production after previous infection in the animals with the highest productive potential. These results confirmed that the level of milk production in dairy goats... Mostrar Tudo |
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Palavras-Chave: |
Controle; Nematodeo gastrintestinal. |
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Thesagro: |
Cabra Leiteira; Caprino; Haemonchus Contortus; Resistência Genética. |
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Thesaurus Nal: |
Dairy goats; Disease resistance; Gastrointestinal nematodes; Genetic resistance; Milk production; Nematode infections; Trichostrongylus colubriformis. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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Marc: |
LEADER 02747naa a2200301 a 4500
001 1524112
005 2023-12-11
008 1997 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1016/S0304-4017(97)00131-3$2DOI
100 1 $aCHARTIER, C.
245 $aResponse to challenge infection with Haemonchus contortus and Trichostrongylus colubriformis in dairy goats differences between high and low-producers.
260 $c1997
520 $aAbstract: The objective of the study was to analyse the influence of the level of milk production in dairy goats on the ability to develop resistance to gastrointestinal nematode infection. Two groups of 50 goats were initially exposed (Group ‘Previously Infected’ PI) or not exposed (Group ‘Not Previously Infected’ NPI) to repeated infections with a mixture of Haemonchus contortus and Trichostrongylus colubriformis. After anthelmintic treatment, goats from both groups remained free of parasites for 2 months around kidding. One month after kidding, 24 lactating goats in each group were challenged with Haemonchus contortus and Trichostrongylus colubriformis. Parasitological, pathophysiological and milk production parameters were then examined fortnightly for 3 months following challenge. Within the PI and NPI group, the response to challenge was compared between the 25% goats exhibiting the lowest level of milk production and the 25% with the highest level of production. In the low producers, previous contact with the parasites was associated with a decrease in egg excretion which was not apparent in the high producers. Previous exposure to parasites was also associated with more severe pathophysiological disturbances in the high producers. Lastly, the response to challenge also induced more severe depression in milk production after previous infection in the animals with the highest productive potential. These results confirmed that the level of milk production in dairy goats could influence the resistance and/or resilience to parasitism with more severe consequences detected in the high producers. In addition, the results suggest that such differences could in fact be mainly related to differences in the host response to parasites.
650 $aDairy goats
650 $aDisease resistance
650 $aGastrointestinal nematodes
650 $aGenetic resistance
650 $aMilk production
650 $aNematode infections
650 $aTrichostrongylus colubriformis
650 $aCabra Leiteira
650 $aCaprino
650 $aHaemonchus Contortus
650 $aResistência Genética
653 $aControle
653 $aNematodeo gastrintestinal
700 1 $aHOSTE, H.
773 $tVeterinary Parasitology$gv. 73, n. 3/4, p. 267-276, 1997.
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Embrapa Caprinos e Ovinos (CNPC) |
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Registro Completo
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Biblioteca(s): |
Embrapa Florestas. |
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Data corrente: |
15/02/2006 |
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Data da última atualização: |
09/02/2015 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
Nacional - B |
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Autoria: |
PEREIRA, J. C. D.; TOMASELLI, I. |
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Título: |
A influência do desbaste na qualidade da madeira de Pinus elliiottii Engelm. var. elliiottii. |
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Ano de publicação: |
2004 |
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Fonte/Imprenta: |
Boletim de Pesquisa Florestal, Colombo, n. 49, p. 61-81, jul./dez. 2004. |
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Idioma: |
Português |
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Conteúdo: |
Como subsídio para o aprimoramento da qualidade da madeira de Pinus elliottii Engelm var. elliottii , plantado no sul do Brasil, foram estudados os efeitos de diferentes intensidades de desbaste em algumas de suas principais propriedades. Em função do aumento da intensidade de desbaste, observaram- se tendências de aumento da densidade básica, teor de lenho tardio, espessura dos anéis de crescimento, ângulo de inclinação das fibras e diâmetros externo e interno (lúmen) dos traqueóides. O comprimento dos traqueóides e os coeficientes de retratibilidade revelaram tendências inversas. Os teores de pentosana, lignina e celulose não foram significativamente influenciados pelo desbaste. A resistência à flexão estática apresentou seus maiores valores na madeira produzida nas parcelas submetidas a desbaste moderado, nas quais 25% da área basal foi removida. |
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Palavras-Chave: |
Intensidade de desbaste; Propriedade da madeira; Slash pine; Thinning intensivity. |
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Thesagro: |
Pinus Elliottii. |
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Thesaurus NAL: |
wood properties. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/CNPF-2009-09/39093/1/Pag_61_81.pdf
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Marc: |
LEADER 01512naa a2200205 a 4500
001 1311925
005 2015-02-09
008 2004 bl uuuu u00u1 u #d
100 1 $aPEREIRA, J. C. D.
245 $aA influência do desbaste na qualidade da madeira de Pinus elliiottii Engelm. var. elliiottii.
260 $c2004
520 $aComo subsídio para o aprimoramento da qualidade da madeira de Pinus elliottii Engelm var. elliottii , plantado no sul do Brasil, foram estudados os efeitos de diferentes intensidades de desbaste em algumas de suas principais propriedades. Em função do aumento da intensidade de desbaste, observaram- se tendências de aumento da densidade básica, teor de lenho tardio, espessura dos anéis de crescimento, ângulo de inclinação das fibras e diâmetros externo e interno (lúmen) dos traqueóides. O comprimento dos traqueóides e os coeficientes de retratibilidade revelaram tendências inversas. Os teores de pentosana, lignina e celulose não foram significativamente influenciados pelo desbaste. A resistência à flexão estática apresentou seus maiores valores na madeira produzida nas parcelas submetidas a desbaste moderado, nas quais 25% da área basal foi removida.
650 $awood properties
650 $aPinus Elliottii
653 $aIntensidade de desbaste
653 $aPropriedade da madeira
653 $aSlash pine
653 $aThinning intensivity
700 1 $aTOMASELLI, I.
773 $tBoletim de Pesquisa Florestal, Colombo$gn. 49, p. 61-81, jul./dez. 2004.
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