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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
01/08/1992 |
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Data da última atualização: |
02/10/2023 |
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Autoria: |
WAGLAND, B. M.; STEEL, J. W.; WINDON, R. G.; DINEEM, J. K. |
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Título: |
The response of lambs to vaccination and challenge with Trichostrongylus colubriformis: Effect of plane of nutrition on, and the inter-relationship between, immunological responsiveness and resistance. |
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Ano de publicação: |
1984 |
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Fonte/Imprenta: |
International Journal for Parasitology, v. 14, n. 1, p. 39-44, Feb. 1984. |
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Idioma: |
Inglês |
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Conteúdo: |
Wagland B. M., Steel J. W., Windon R. G. and Dineen J. K. 1984. The response of lambs to vaccination and challenge with Trichostrongylus colubriformis: effect of plane of nutrition on, and the inter-relationship between, immunological responsiveness and resistance. International Journal for Parasitology14: 39?44. Merino lambs weaned at 8 weeks of age were fed either ground and pelleted (high plane, HP) or chopped (low plane, LP) lucerne hay ad libitum to achieve an approximate 2-fold difference in liveweight gain. When aged 17 and 21 weeks, 15 of the 20 lambs in each diet group were vaccinated with 80,000 irradiated T. colubriformis larvae. At 25 weeks, vaccinated and unvaccinated lambs were treated with anthelmintic and one week later challenged with 30,000 normal larvae. Four weeks after challenge the animals were killed for worm counts. After vaccination HP lambs had higher titres of antibodies to the parasite and after challenge had lower worm egg outputs, and lower worm burdens than LP lambs. Immunological responsiveness (serum titre of complement-fixing antibodies against worm antigen) and manifestations of resistance (eggs produced per female worm per day and percent protection calculated from worm counts) were significantly correlated within dietary groups. Percent protection and egg production per female worm were highly correlated (r = ?0.81) in individual animals pooled over dietary groups, suggesting that both manifestations of resistance respond to essentially the same immunological mechanism. Failure to obtain significant correlation between weight gain pre-vaccination and immunological and resistance parameters indicated that animal production and resistance to infection are not genetically linked. Negative correlation of weight gain during the vaccination period with serum antibody titre at challenge suggests that the developing immune response competes with weight gain for limited physiological resources of the animal. MenosWagland B. M., Steel J. W., Windon R. G. and Dineen J. K. 1984. The response of lambs to vaccination and challenge with Trichostrongylus colubriformis: effect of plane of nutrition on, and the inter-relationship between, immunological responsiveness and resistance. International Journal for Parasitology14: 39?44. Merino lambs weaned at 8 weeks of age were fed either ground and pelleted (high plane, HP) or chopped (low plane, LP) lucerne hay ad libitum to achieve an approximate 2-fold difference in liveweight gain. When aged 17 and 21 weeks, 15 of the 20 lambs in each diet group were vaccinated with 80,000 irradiated T. colubriformis larvae. At 25 weeks, vaccinated and unvaccinated lambs were treated with anthelmintic and one week later challenged with 30,000 normal larvae. Four weeks after challenge the animals were killed for worm counts. After vaccination HP lambs had higher titres of antibodies to the parasite and after challenge had lower worm egg outputs, and lower worm burdens than LP lambs. Immunological responsiveness (serum titre of complement-fixing antibodies against worm antigen) and manifestations of resistance (eggs produced per female worm per day and percent protection calculated from worm counts) were significantly correlated within dietary groups. Percent protection and egg production per female worm were highly correlated (r = ?0.81) in individual animals pooled over dietary groups, suggesting that both manifestations of resistance respond to essentially t... Mostrar Tudo |
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Palavras-Chave: |
Immunological responsiveness; Nematodeo; Plane of nutrition; Plano de nutrição; Resistance to challenge; Resposta imunológica. |
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Thesagro: |
Alimentação; Cordeiro; Imunologia; Nutrição Animal; Ovino; Parasitologia; Vacinação. |
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Thesaurus Nal: |
Antibody formation; Lambs; Live vaccines; Sheep diseases; Trichostrongylus colubriformis; Vaccination. |
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Categoria do assunto: |
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Marc: |
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001 1519529
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008 1984 bl uuuu u00u1 u #d
100 1 $aWAGLAND, B. M.
245 $aThe response of lambs to vaccination and challenge with Trichostrongylus colubriformis$bEffect of plane of nutrition on, and the inter-relationship between, immunological responsiveness and resistance.$h[electronic resource]
260 $c1984
520 $aWagland B. M., Steel J. W., Windon R. G. and Dineen J. K. 1984. The response of lambs to vaccination and challenge with Trichostrongylus colubriformis: effect of plane of nutrition on, and the inter-relationship between, immunological responsiveness and resistance. International Journal for Parasitology14: 39?44. Merino lambs weaned at 8 weeks of age were fed either ground and pelleted (high plane, HP) or chopped (low plane, LP) lucerne hay ad libitum to achieve an approximate 2-fold difference in liveweight gain. When aged 17 and 21 weeks, 15 of the 20 lambs in each diet group were vaccinated with 80,000 irradiated T. colubriformis larvae. At 25 weeks, vaccinated and unvaccinated lambs were treated with anthelmintic and one week later challenged with 30,000 normal larvae. Four weeks after challenge the animals were killed for worm counts. After vaccination HP lambs had higher titres of antibodies to the parasite and after challenge had lower worm egg outputs, and lower worm burdens than LP lambs. Immunological responsiveness (serum titre of complement-fixing antibodies against worm antigen) and manifestations of resistance (eggs produced per female worm per day and percent protection calculated from worm counts) were significantly correlated within dietary groups. Percent protection and egg production per female worm were highly correlated (r = ?0.81) in individual animals pooled over dietary groups, suggesting that both manifestations of resistance respond to essentially the same immunological mechanism. Failure to obtain significant correlation between weight gain pre-vaccination and immunological and resistance parameters indicated that animal production and resistance to infection are not genetically linked. Negative correlation of weight gain during the vaccination period with serum antibody titre at challenge suggests that the developing immune response competes with weight gain for limited physiological resources of the animal.
650 $aAntibody formation
650 $aLambs
650 $aLive vaccines
650 $aSheep diseases
650 $aTrichostrongylus colubriformis
650 $aVaccination
650 $aAlimentação
650 $aCordeiro
650 $aImunologia
650 $aNutrição Animal
650 $aOvino
650 $aParasitologia
650 $aVacinação
653 $aImmunological responsiveness
653 $aNematodeo
653 $aPlane of nutrition
653 $aPlano de nutrição
653 $aResistance to challenge
653 $aResposta imunológica
700 1 $aSTEEL, J. W.
700 1 $aWINDON, R. G.
700 1 $aDINEEM, J. K.
773 $tInternational Journal for Parasitology$gv. 14, n. 1, p. 39-44, Feb. 1984.
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