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Registro Completo |
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Biblioteca(s): |
Embrapa Meio Norte / UEP-Parnaíba. |
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Data corrente: |
27/08/1999 |
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Data da última atualização: |
27/08/1999 |
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Autoria: |
BADINGA, L.; COLLIER, R. J.; THATCHER, W. W.; WILCOX, C. J. |
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Afiliação: |
University of Florida. |
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Título: |
Effects of climatic and management factors on conception rate of dairy cattle in subtropical environment. |
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Ano de publicação: |
1985 |
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Fonte/Imprenta: |
Journal of Dairy Science, v.68, p.78-85, 1985. |
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Volume: |
v.68 |
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Páginas: |
p.78-85 |
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Idioma: |
Inglês |
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Conteúdo: |
Breeding records, representing 12,038 inseminations at Bassett's Dairy Farm (Monticello, FL), were analyzed to document effects of environnmental and management factors on fertility of dairy cattle from January 1, 1975 to December 31, 1977. Conception rates of lactating cows decreased sharply when maximum air temperature on day after insemination exceeded 30 graus C. In contrast, conception rates for heifers did not decline until 35 graus C. Virgin heifers had higher conception rates for all services (50%) than lactating cows (34%) and suffered only slight depression on fertility during summer months. Heifers required 1.5 services per conception compared with 2.3 for lactating cows. Relationship between conception rate and rainfall on day after insemination was negative and curvilinear. Jerseys had higher conception rates (45%) than Holstein (39%) and Brown Swiss (41%). Services per conception were 1.7, 2.0, and 1.9. Substantial decreases of fertility were associated with advancing service number. Estrous status (standing; positive heat detection patch; mounting activity), inseminator, and year of service were related to variation of conception rate. Seasonal effects on fertility of lactating cows were marked. Thus, environmental management of the postpartum cow during hot summer months is warranted to maximize fertility. |
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Palavras-Chave: |
Gado de leite. |
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Thesagro: |
Bioclimatologia; Reprodução. |
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Thesaurus Nal: |
bioclimatology; dairy cattle; reproduction. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02039naa a2200253 a 4500
001 1079939
005 1999-08-27
008 1985 bl --- 0-- u #d
100 1 $aBADINGA, L.
245 $aEffects of climatic and management factors on conception rate of dairy cattle in subtropical environment.
260 $c1985
300 $ap.78-85 v.68
490 $vv.68
520 $aBreeding records, representing 12,038 inseminations at Bassett's Dairy Farm (Monticello, FL), were analyzed to document effects of environnmental and management factors on fertility of dairy cattle from January 1, 1975 to December 31, 1977. Conception rates of lactating cows decreased sharply when maximum air temperature on day after insemination exceeded 30 graus C. In contrast, conception rates for heifers did not decline until 35 graus C. Virgin heifers had higher conception rates for all services (50%) than lactating cows (34%) and suffered only slight depression on fertility during summer months. Heifers required 1.5 services per conception compared with 2.3 for lactating cows. Relationship between conception rate and rainfall on day after insemination was negative and curvilinear. Jerseys had higher conception rates (45%) than Holstein (39%) and Brown Swiss (41%). Services per conception were 1.7, 2.0, and 1.9. Substantial decreases of fertility were associated with advancing service number. Estrous status (standing; positive heat detection patch; mounting activity), inseminator, and year of service were related to variation of conception rate. Seasonal effects on fertility of lactating cows were marked. Thus, environmental management of the postpartum cow during hot summer months is warranted to maximize fertility.
650 $abioclimatology
650 $adairy cattle
650 $areproduction
650 $aBioclimatologia
650 $aReprodução
653 $aGado de leite
700 1 $aCOLLIER, R. J.
700 1 $aTHATCHER, W. W.
700 1 $aWILCOX, C. J.
773 $tJournal of Dairy Science$gv.68, p.78-85, 1985.
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Registro original: |
Embrapa Meio Norte / UEP-Parnaíba (CPAMN-UEPP) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Milho e Sorgo. Para informações adicionais entre em contato com cnpms.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Milho e Sorgo. |
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Data corrente: |
03/12/2014 |
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Data da última atualização: |
03/12/2014 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
B - 1 |
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Autoria: |
LEITE, N. A.; MENDES, S. M.; SANTOS, C. A. dos; PEREIRA, E. J. G. |
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Afiliação: |
SIMONE MARTINS MENDES, CNPMS. |
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Título: |
Does Cry1Ab maize interfere in the biology and behavioural traits of Podisus nigrispinus? |
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Ano de publicação: |
2014 |
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Fonte/Imprenta: |
Bulletin of Insectology, Bologna, v. 67, n. 2, p. 265-271, 2014. |
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Idioma: |
Inglês |
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Conteúdo: |
Transgenic plants expressing Bacillus thuringiensis proteins can indirectly affect natural enemies of target insects, and the assessment of these effects is essential in risk analysis of genetically modified plants. The biology of Podisus nigrispinus (Dallas) (Hemiptera Pentatomidae) and changes in the predation behaviour of this insect when fed with Bt (Cry1Ab) maize-fed Spodoptera frugiperda (J. E. Smith) larvae (Lepidoptera Noctuidae) was evaluated. The predator showed 43.7% delay in the nymphal development time and 15% biomass reduction in the fifth instar, probably due to low nutritional quality of prey exposed to Bt maize. Survival curves were similar in predators fed with S. frugiperda larvae exposed and not exposed to Bt maize. The predator search time was slightly influenced by the developmental delay of S. frugiperda fed with Bt maize. In a greenhouse assay P. nigrispinus was important in controlling S. frugiperda density in Bt maize expressing the Cry1Ab protein. Our laboratory results indicate that Bt maize may cause indirect effects on P. nigrispinus, and suggest that nutritional prey-quality factors other than the Bt protein determine the observed negative effects. However, the semi-field greenhouse assays demonstrate that indirect negative effects of Bt maize on the predator?s performance and search behaviour is not substantiated, and that plant damage is lowest if Bt maize is used concurrently with biological control by P. nigrispinus for managing S. frugiperda. MenosTransgenic plants expressing Bacillus thuringiensis proteins can indirectly affect natural enemies of target insects, and the assessment of these effects is essential in risk analysis of genetically modified plants. The biology of Podisus nigrispinus (Dallas) (Hemiptera Pentatomidae) and changes in the predation behaviour of this insect when fed with Bt (Cry1Ab) maize-fed Spodoptera frugiperda (J. E. Smith) larvae (Lepidoptera Noctuidae) was evaluated. The predator showed 43.7% delay in the nymphal development time and 15% biomass reduction in the fifth instar, probably due to low nutritional quality of prey exposed to Bt maize. Survival curves were similar in predators fed with S. frugiperda larvae exposed and not exposed to Bt maize. The predator search time was slightly influenced by the developmental delay of S. frugiperda fed with Bt maize. In a greenhouse assay P. nigrispinus was important in controlling S. frugiperda density in Bt maize expressing the Cry1Ab protein. Our laboratory results indicate that Bt maize may cause indirect effects on P. nigrispinus, and suggest that nutritional prey-quality factors other than the Bt protein determine the observed negative effects. However, the semi-field greenhouse assays demonstrate that indirect negative effects of Bt maize on the predator?s performance and search behaviour is not substantiated, and that plant damage is lowest if Bt maize is used concurrently with biological control by P. nigrispinus for managing S. frugiper... Mostrar Tudo |
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Palavras-Chave: |
Milho Bt; Predação. |
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Thesagro: |
Controle biológico; Spodoptera frugiperda. |
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Thesaurus NAL: |
Predation. |
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Categoria do assunto: |
H Saúde e Patologia |
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Marc: |
LEADER 02151naa a2200217 a 4500
001 2001478
005 2014-12-03
008 2014 bl uuuu u00u1 u #d
100 1 $aLEITE, N. A.
245 $aDoes Cry1Ab maize interfere in the biology and behavioural traits of Podisus nigrispinus?$h[electronic resource]
260 $c2014
520 $aTransgenic plants expressing Bacillus thuringiensis proteins can indirectly affect natural enemies of target insects, and the assessment of these effects is essential in risk analysis of genetically modified plants. The biology of Podisus nigrispinus (Dallas) (Hemiptera Pentatomidae) and changes in the predation behaviour of this insect when fed with Bt (Cry1Ab) maize-fed Spodoptera frugiperda (J. E. Smith) larvae (Lepidoptera Noctuidae) was evaluated. The predator showed 43.7% delay in the nymphal development time and 15% biomass reduction in the fifth instar, probably due to low nutritional quality of prey exposed to Bt maize. Survival curves were similar in predators fed with S. frugiperda larvae exposed and not exposed to Bt maize. The predator search time was slightly influenced by the developmental delay of S. frugiperda fed with Bt maize. In a greenhouse assay P. nigrispinus was important in controlling S. frugiperda density in Bt maize expressing the Cry1Ab protein. Our laboratory results indicate that Bt maize may cause indirect effects on P. nigrispinus, and suggest that nutritional prey-quality factors other than the Bt protein determine the observed negative effects. However, the semi-field greenhouse assays demonstrate that indirect negative effects of Bt maize on the predator?s performance and search behaviour is not substantiated, and that plant damage is lowest if Bt maize is used concurrently with biological control by P. nigrispinus for managing S. frugiperda.
650 $aPredation
650 $aControle biológico
650 $aSpodoptera frugiperda
653 $aMilho Bt
653 $aPredação
700 1 $aMENDES, S. M.
700 1 $aSANTOS, C. A. dos
700 1 $aPEREIRA, E. J. G.
773 $tBulletin of Insectology, Bologna$gv. 67, n. 2, p. 265-271, 2014.
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Embrapa Milho e Sorgo (CNPMS) |
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