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Registro Completo |
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Biblioteca(s): |
Embrapa Gado de Leite. |
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Data corrente: |
23/03/2009 |
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Data da última atualização: |
16/02/2024 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
TORRES-JÚNIOR, J. R. S.; PIRES, M. F. A.; SÁ, W. F.; FERREIRA, A. de M.; VIANA, J. H. M.; CAMARGO, L. S. A.; RAMOS, A. A.; FOLHADELLA, I. M.; POLISSENI, J.; FREITAS, C.; CLEMENTE, C. A. A.; SÁ FILHO, M. F.; PAULA-LOPES, F. F.; BARUSELLI, P. S. |
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Afiliação: |
J. R. S. Torres-Júnior, FMVZ/USP; Maria de Fátima Ávila Pires, Embrapa Gado de Leite; Wanderlei Ferreira de Sá, Embrapa Gado de Leite; Ademir de Moraes Ferreira, Embrapa Gado de Leite; João Henrique Moreira Viana, Embrapa Gado de Leite; Luiz Sérgio Almei. |
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Título: |
Effect of maternal heat-stress on follicular growth and oocyte competence in Bos indicus cattle. |
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Ano de publicação: |
2008 |
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Fonte/Imprenta: |
Theriogenology, v. 69, n. 2, p. 155-166, 2008. |
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DOI: |
https://doi.org/10.1016/j.theriogenology.2007.06.023 |
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Idioma: |
Inglês |
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Conteúdo: |
The objective was to determine whether exposure of Gir (Bos indicus) cows to heat-stress (HS) causes immediate and delayed deleterious effect on follicular dynamics, hormonal profile and oocyte competence. The cows were kept in tie-stalls for an adaptive thermoneutral period of 28 days (Phase I, Days −28 to −1). In Phase II (Days 0–28) cows were randomly allocated into control (CG, n = 5) and HS (HS, n = 5) treatments. The HS cows were placed in an environmental chamber at 38 °C and 80% relative humidity (RH) during the day and 30 °C, 80% RH during the night for 28 days. The CG group was maintained in shaded tie-stalls (ambient temperature) for 28 days. During Phase III (Days 28–147) animals were placed in tie-stalls (Days 28–42) followed by pasture (Days 42–147) under thermoneutrality. In each phase, weekly ovum pick up (OPU) sessions were to evaluate follicular development, morphology of cumulus–oocyte complexes (COCs), and developmental competence after in vitro maturation, fertilization, and culture. Serum concentrations of progesterone (P4) and cortisol were evaluated by radioimmunoassay. Exposure of Gir cows to HS had no immediate effect on reproductive function, but exerted a delayed deleterious effect on ovarian follicular growth, hormone concentrations, and oocyte competence. Heat-stress increased the diameter of the first and second largest follicles from Days 28 to 49. Indeed, HS increased the number of >9 mm follicles (characterized as follicular codominance) during this phase. Cows exposed to HS had longer periods of non-cyclic activity (P4 < 1 ng/mL), as well as shorter estrous cycles. However, HS did not affect cortisol concentration as compared to CG. Although HS had no significant effect on cleavage rate, it reduced blastocyst development during Phase III. In conclusion, long-term exposure of B. indicus cattle to HS had a delayed deleterious effect on ovarian follicular dynamics and oocyte competence. MenosThe objective was to determine whether exposure of Gir (Bos indicus) cows to heat-stress (HS) causes immediate and delayed deleterious effect on follicular dynamics, hormonal profile and oocyte competence. The cows were kept in tie-stalls for an adaptive thermoneutral period of 28 days (Phase I, Days −28 to −1). In Phase II (Days 0–28) cows were randomly allocated into control (CG, n = 5) and HS (HS, n = 5) treatments. The HS cows were placed in an environmental chamber at 38 °C and 80% relative humidity (RH) during the day and 30 °C, 80% RH during the night for 28 days. The CG group was maintained in shaded tie-stalls (ambient temperature) for 28 days. During Phase III (Days 28–147) animals were placed in tie-stalls (Days 28–42) followed by pasture (Days 42–147) under thermoneutrality. In each phase, weekly ovum pick up (OPU) sessions were to evaluate follicular development, morphology of cumulus–oocyte complexes (COCs), and developmental competence after in vitro maturation, fertilization, and culture. Serum concentrations of progesterone (P4) and cortisol were evaluated by radioimmunoassay. Exposure of Gir cows to HS had no immediate effect on reproductive function, but exerted a delayed deleterious effect on ovarian follicular growth, hormone concentrations, and oocyte competence. Heat-stress increased the diameter of the first and second largest follicles from Days 28 to 49. Indeed, HS increased the number of >9 mm follicles (characterized as follicular codominance) dur... Mostrar Tudo |
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Palavras-Chave: |
Gir; Heat-stress; IVF; Oocyte; Ovarian follicle; PIV. |
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Thesagro: |
Bos Indicus. |
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Thesaurus Nal: |
animal reproduction. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/doc/596415/1/Effect-of-maternal-heat-stress-on-follicular-growth-and-oocyte-competence-in-Bos-indicus-cattle.pdf
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Marc: |
LEADER 03070naa a2200385 a 4500
001 1596415
005 2024-02-16
008 2008 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1016/j.theriogenology.2007.06.023$2DOI
100 1 $aTORRES-JÚNIOR, J. R. S.
245 $aEffect of maternal heat-stress on follicular growth and oocyte competence in Bos indicus cattle.$h[electronic resource]
260 $c2008
520 $aThe objective was to determine whether exposure of Gir (Bos indicus) cows to heat-stress (HS) causes immediate and delayed deleterious effect on follicular dynamics, hormonal profile and oocyte competence. The cows were kept in tie-stalls for an adaptive thermoneutral period of 28 days (Phase I, Days −28 to −1). In Phase II (Days 0–28) cows were randomly allocated into control (CG, n = 5) and HS (HS, n = 5) treatments. The HS cows were placed in an environmental chamber at 38 °C and 80% relative humidity (RH) during the day and 30 °C, 80% RH during the night for 28 days. The CG group was maintained in shaded tie-stalls (ambient temperature) for 28 days. During Phase III (Days 28–147) animals were placed in tie-stalls (Days 28–42) followed by pasture (Days 42–147) under thermoneutrality. In each phase, weekly ovum pick up (OPU) sessions were to evaluate follicular development, morphology of cumulus–oocyte complexes (COCs), and developmental competence after in vitro maturation, fertilization, and culture. Serum concentrations of progesterone (P4) and cortisol were evaluated by radioimmunoassay. Exposure of Gir cows to HS had no immediate effect on reproductive function, but exerted a delayed deleterious effect on ovarian follicular growth, hormone concentrations, and oocyte competence. Heat-stress increased the diameter of the first and second largest follicles from Days 28 to 49. Indeed, HS increased the number of >9 mm follicles (characterized as follicular codominance) during this phase. Cows exposed to HS had longer periods of non-cyclic activity (P4 < 1 ng/mL), as well as shorter estrous cycles. However, HS did not affect cortisol concentration as compared to CG. Although HS had no significant effect on cleavage rate, it reduced blastocyst development during Phase III. In conclusion, long-term exposure of B. indicus cattle to HS had a delayed deleterious effect on ovarian follicular dynamics and oocyte competence.
650 $aanimal reproduction
650 $aBos Indicus
653 $aGir
653 $aHeat-stress
653 $aIVF
653 $aOocyte
653 $aOvarian follicle
653 $aPIV
700 1 $aPIRES, M. F. A.
700 1 $aSÁ, W. F.
700 1 $aFERREIRA, A. de M.
700 1 $aVIANA, J. H. M.
700 1 $aCAMARGO, L. S. A.
700 1 $aRAMOS, A. A.
700 1 $aFOLHADELLA, I. M.
700 1 $aPOLISSENI, J.
700 1 $aFREITAS, C.
700 1 $aCLEMENTE, C. A. A.
700 1 $aSÁ FILHO, M. F.
700 1 $aPAULA-LOPES, F. F.
700 1 $aBARUSELLI, P. S.
773 $tTheriogenology$gv. 69, n. 2, p. 155-166, 2008.
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Registro original: |
Embrapa Gado de Leite (CNPGL) |
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Registro Completo
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Biblioteca(s): |
Embrapa Amazônia Oriental. |
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Data corrente: |
16/12/2013 |
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Data da última atualização: |
20/10/2022 |
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Tipo da produção científica: |
Artigo em Anais de Congresso |
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Autoria: |
VENTURIERI, A.; COELHO, A. dos S.; THALES, M. C.; BACELAR, M. D. R. |
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Afiliação: |
ADRIANO VENTURIERI, CPATU; Andréa dos Santos Coelho, BOLSISTA CPATU/CNPQ; Marcelo Cordeiro Thales, MPEG; Maria Denise Ribeiro Bacelar, IBGE. |
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Título: |
Análise da expansão da agricultura de grãos na região de Santarém e Belterra, Oeste do estado do Pará. |
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Ano de publicação: |
2007 |
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Fonte/Imprenta: |
In: SIMPÓSIO BRASILEIRO DE SENSORIAMENTO REMOTO, 13., 2007, Florianópolis. Anais... São José dos Campos: INPE, 2007. |
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Páginas: |
p. 7003-7010. |
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Idioma: |
Português |
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Conteúdo: |
The images obtained from orbital platforms have been used for the analysis of many occupation processes of the Amazon region along the years. Nevertheless, analyses that have only one date of passage portray just a point in time and, for that, do not explain the occupation process of the region. The evolution of the mechanical agriculture in the towns of Belterra and Santarém, in the west side of Pará state, is causing a series of conflicts between the producers and the environmental movements because of the hypothesis of the expansion of the cultivated area in detriment of the areas of forest formation. Through a time series analysis that uses images from the sensors MSS and TM Landsat from 1975, 1986, 1997, 1999, 2004 and 2005, using digital classification and an intense field work, it was possible to observe the dynamic of the use and the discovery of the land. The results show that there was a reduction of 25% of the forest in the last 30 years. Although the main landscape is the forest formation, it was found that the use of the land with the most occupied area are the regions destinated to the agriculture and cattle activities and which are related to the producers of different levels of technology who try to combine a series of productive systems, aiming the diversity of the natural resources. In addition, it was possible to observe that, unlike other regions in the Amazon, the areas of secondary vegetation presented a high growth in the analyzed time period. Finally it is noticed that the culture of grains was implemented, mostly, in areas that were altered and used for pasture, secondary vegetation and agriculture and livestock activities (related to small and medium producers), having been converted a total of 435 km2 of forest from the year of 1999 to 2004, representing 8% of the total planted area in that year. Although we notice a smaller impact in the environmental context, the direct conversion of the agriculture and livestock class into the grain plantation seems to indicate a process of land concentration and migration of smallholder farmers to the urban areas and/ or new fronts of occupation. This social impact, already observed in Santarém suburbs, should be object of study for the government, mainly concerning the elaboration and implementation of a specific agricultural politics for the Amazon and should enable the smallholder farmer the maintenance of his land and food production. MenosThe images obtained from orbital platforms have been used for the analysis of many occupation processes of the Amazon region along the years. Nevertheless, analyses that have only one date of passage portray just a point in time and, for that, do not explain the occupation process of the region. The evolution of the mechanical agriculture in the towns of Belterra and Santarém, in the west side of Pará state, is causing a series of conflicts between the producers and the environmental movements because of the hypothesis of the expansion of the cultivated area in detriment of the areas of forest formation. Through a time series analysis that uses images from the sensors MSS and TM Landsat from 1975, 1986, 1997, 1999, 2004 and 2005, using digital classification and an intense field work, it was possible to observe the dynamic of the use and the discovery of the land. The results show that there was a reduction of 25% of the forest in the last 30 years. Although the main landscape is the forest formation, it was found that the use of the land with the most occupied area are the regions destinated to the agriculture and cattle activities and which are related to the producers of different levels of technology who try to combine a series of productive systems, aiming the diversity of the natural resources. In addition, it was possible to observe that, unlike other regions in the Amazon, the areas of secondary vegetation presented a high growth in the analyzed time period. Finally ... Mostrar Tudo |
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Palavras-Chave: |
Cultura de grãos. |
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Thesagro: |
Sensoriamento Remoto. |
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Thesaurus NAL: |
Amazonia. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/94124/1/7003-7010.pdf
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Marc: |
LEADER 03126nam a2200193 a 4500
001 1974089
005 2022-10-20
008 2007 bl uuuu u00u1 u #d
100 1 $aVENTURIERI, A.
245 $aAnálise da expansão da agricultura de grãos na região de Santarém e Belterra, Oeste do estado do Pará.$h[electronic resource]
260 $aIn: SIMPÓSIO BRASILEIRO DE SENSORIAMENTO REMOTO, 13., 2007, Florianópolis. Anais... São José dos Campos: INPE$c2007
300 $ap. 7003-7010.
520 $aThe images obtained from orbital platforms have been used for the analysis of many occupation processes of the Amazon region along the years. Nevertheless, analyses that have only one date of passage portray just a point in time and, for that, do not explain the occupation process of the region. The evolution of the mechanical agriculture in the towns of Belterra and Santarém, in the west side of Pará state, is causing a series of conflicts between the producers and the environmental movements because of the hypothesis of the expansion of the cultivated area in detriment of the areas of forest formation. Through a time series analysis that uses images from the sensors MSS and TM Landsat from 1975, 1986, 1997, 1999, 2004 and 2005, using digital classification and an intense field work, it was possible to observe the dynamic of the use and the discovery of the land. The results show that there was a reduction of 25% of the forest in the last 30 years. Although the main landscape is the forest formation, it was found that the use of the land with the most occupied area are the regions destinated to the agriculture and cattle activities and which are related to the producers of different levels of technology who try to combine a series of productive systems, aiming the diversity of the natural resources. In addition, it was possible to observe that, unlike other regions in the Amazon, the areas of secondary vegetation presented a high growth in the analyzed time period. Finally it is noticed that the culture of grains was implemented, mostly, in areas that were altered and used for pasture, secondary vegetation and agriculture and livestock activities (related to small and medium producers), having been converted a total of 435 km2 of forest from the year of 1999 to 2004, representing 8% of the total planted area in that year. Although we notice a smaller impact in the environmental context, the direct conversion of the agriculture and livestock class into the grain plantation seems to indicate a process of land concentration and migration of smallholder farmers to the urban areas and/ or new fronts of occupation. This social impact, already observed in Santarém suburbs, should be object of study for the government, mainly concerning the elaboration and implementation of a specific agricultural politics for the Amazon and should enable the smallholder farmer the maintenance of his land and food production.
650 $aAmazonia
650 $aSensoriamento Remoto
653 $aCultura de grãos
700 1 $aCOELHO, A. dos S.
700 1 $aTHALES, M. C.
700 1 $aBACELAR, M. D. R.
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Embrapa Amazônia Oriental (CPATU) |
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