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Registro Completo |
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Biblioteca(s): |
Embrapa Rondônia. |
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Data corrente: |
02/06/2022 |
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Data da última atualização: |
02/06/2022 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
PFEIFER, L. F. M.; GASPERIN, B. G.; CESTARO, J. P.; SCHNEIDER, A. |
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Afiliação: |
LUIZ FRANCISCO MACHADO PFEIFER, CPAF-RO; B. G. GASPERIN, Universidade Federal de Pelotas (UFPel); J. P. CESTARO, Universidade Federal do Acre (Ufac); A. SCHNEIDER, Universidade Federal de Pelotas (UFPel). |
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Título: |
Postponing TAI in beef cows with small preovulatory follicles. |
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Ano de publicação: |
2022 |
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Fonte/Imprenta: |
Animal Reproduction Science, v. 242, 107006, 2022. |
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ISSN: |
0378-4320 |
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DOI: |
https://doi.org/10.1016/j.anireprosci.2022.107006 |
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Idioma: |
Inglês |
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Conteúdo: |
The aims of this study were (1) to establish an optimal cut-off point for evaluating the effect of the preovulatory follicle (POF) diameter in timed AI (TAI) programs, and (2) to evaluate the effect of postponing TAI in cows with smaller follicles on pregnancy per AI (P/AI). In Study 1, Nelore cows (n = 426) were subjected to an estradiol-progesterone (P4) based TAI protocol. The diameter of POF was measured at TAI, 48 h after P4 insert removal. From the ROC curves for determining the relationship between the POF diameter and pregnancy, the cut-off was 11 mm (P < 0.001). Cows with larger POF had greater (P < 0.05) P/AI (62.5%) than cows with smaller POF (34.8%). In Study 2, Nelore cows (n = 1257) were subjected to the same TAI protocol as in Study 1. Before TAI, cows were separated according to POF diameter in three groups: (1) Larger POF (LP, n = 873; POF ≥11 mm), (2) Smaller POF 0 h (SP0, n = 195; POF <11 mm), and (3) Smaller POF 24 h (SP24, n = 189; POF <11 mm). Cows in the LP and SP0 were TAI at 48 h and cows in the SP24 group were TAI at 72 h after P4 insert removal. Cows in the LP group had the greatest (P < 0.05) P/AI (60.25%), followed by cows in the SP24 group (41.8%), while cows in the SP0 group had the lowest P/AI (31.8%). In conclusion, cows with smaller follicles have lower P/AI, but postponing the TAI by 24 h in these cows increases P/AI. |
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Palavras-Chave: |
Diâmetro do folículo; Folículos pré-ovulatórios; Follicular diameter; Preovulatory follicles. |
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Thesagro: |
Ovulação; Reprodução Animal; Vaca de Corte. |
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Thesaurus Nal: |
Animal reproduction; Beef cows; Ovulation. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/doc/1143679/1/cpafro-18765.pdf
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Marc: |
LEADER 02283naa a2200301 a 4500
001 2143679
005 2022-06-02
008 2022 bl uuuu u00u1 u #d
022 $a0378-4320
024 7 $ahttps://doi.org/10.1016/j.anireprosci.2022.107006$2DOI
100 1 $aPFEIFER, L. F. M.
245 $aPostponing TAI in beef cows with small preovulatory follicles.$h[electronic resource]
260 $c2022
520 $aThe aims of this study were (1) to establish an optimal cut-off point for evaluating the effect of the preovulatory follicle (POF) diameter in timed AI (TAI) programs, and (2) to evaluate the effect of postponing TAI in cows with smaller follicles on pregnancy per AI (P/AI). In Study 1, Nelore cows (n = 426) were subjected to an estradiol-progesterone (P4) based TAI protocol. The diameter of POF was measured at TAI, 48 h after P4 insert removal. From the ROC curves for determining the relationship between the POF diameter and pregnancy, the cut-off was 11 mm (P < 0.001). Cows with larger POF had greater (P < 0.05) P/AI (62.5%) than cows with smaller POF (34.8%). In Study 2, Nelore cows (n = 1257) were subjected to the same TAI protocol as in Study 1. Before TAI, cows were separated according to POF diameter in three groups: (1) Larger POF (LP, n = 873; POF ≥11 mm), (2) Smaller POF 0 h (SP0, n = 195; POF <11 mm), and (3) Smaller POF 24 h (SP24, n = 189; POF <11 mm). Cows in the LP and SP0 were TAI at 48 h and cows in the SP24 group were TAI at 72 h after P4 insert removal. Cows in the LP group had the greatest (P < 0.05) P/AI (60.25%), followed by cows in the SP24 group (41.8%), while cows in the SP0 group had the lowest P/AI (31.8%). In conclusion, cows with smaller follicles have lower P/AI, but postponing the TAI by 24 h in these cows increases P/AI.
650 $aAnimal reproduction
650 $aBeef cows
650 $aOvulation
650 $aOvulação
650 $aReprodução Animal
650 $aVaca de Corte
653 $aDiâmetro do folículo
653 $aFolículos pré-ovulatórios
653 $aFollicular diameter
653 $aPreovulatory follicles
700 1 $aGASPERIN, B. G.
700 1 $aCESTARO, J. P.
700 1 $aSCHNEIDER, A.
773 $tAnimal Reproduction Science$gv. 242, 107006, 2022.
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Registro original: |
Embrapa Rondônia (CPAF-RO) |
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Voltar
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Registro Completo
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Biblioteca(s): |
Embrapa Amazônia Ocidental. |
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Data corrente: |
21/06/2022 |
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Data da última atualização: |
21/06/2022 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 1 |
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Autoria: |
SILVA, L. C. R.; CORRÊA, R. S.; WRIGHT, J. L.; BOMFIM, B.; HENDRICKS, L. B.; GAVIN, D. G.; MUNIZ, A. W.; MARTINS, G. C.; MOTTA, A. C. V.; BARBOSA, J. Z.; MELO, V. de F.; YOUNG, S. D.; BROADLEY, M. R.; SANTOS, R. V. |
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Afiliação: |
LUCAS C. R. SILVA, Environmental Studies Program, University of Oregon; RODRIGO STUDART CORRÊA, UnB; JAMIE L. WRIGHT, Environmental Studies Program, University of Oregon; BARBARA BOMFIM, Environmental Studies Program, University of Oregon; LAUREN B. HENDRICKS, Department of Geography, University of Oregon; DANIEL G. GAVIN; ALEKSANDER WESTPHAL MUNIZ, CPAA; GILVAN COIMBRA MARTINS, CPAA; ANTÔNIO CARLOS VARGAS MOTTA, UFPR; JULIERME ZIMMER BARBOSA, Federal Institute of Southeast Minas Gerais; VANDER DE FREITAS MELO, UFPR; SCOTT D. YOUNG, University of Nottingham; MARTIN R. BROADLEY, University of Nottingham; ROBERTO VENTURA SANTOS, UnB. |
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Título: |
Reply to: Evidence confirms an anthropic origin of Amazonian Dark Earths. |
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Ano de publicação: |
2022 |
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Fonte/Imprenta: |
Nature Communications, v. 13, n. 3446, 2022. |
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DOI: |
https://doi.org/10.1038/s41467-022-31065-1 |
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Idioma: |
Inglês |
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Conteúdo: |
REPLYING to Lombardo et al. Nature Communications https://doi.org/10.1038/s41467-022-31064-2 (2022). Amazonian Dark Earths (ADEs) are widely regarded as a model for sustainable agriculture. Their unusual fertility and elevated concentration of charcoal, combined with the frequent occurrence of pre-Columbian artifacts at ADE sites, has prompted widespread biomass burning for soil amendment in tropical regions. However, it remains unclear how these persistent patches of high fertility could have been created in nutrient-impoverished tropical landscapes. In a recent study 1 , we report new data from one of the best-studied ADE sites in Brazil which warrant a revision of its origin story. We found large amounts of phosphorus (P) and calcium (Ca) correlated with 16 trace elements that indicate exogenous sources rather than in situ deposition, an inference that is supported by neodymium (Ne), strontium (Sr) and carbon (C) isotope signatures. Moreover, radiocarbon ( 14 C) activity of charcoal in ADEs suggested inputs beginning thousands of years before the earliest evidence of forest clearing for agriculture in the region. Our results imply that indigenous populations either managed soils at the site thousands of years earlier than previously reported or, alternatively, that human-derived inputs represent a small fraction of ADE’s chemical makeup, a fraction that, we hypothesise based on the size and timing of deposition (Fig. 1), was introduced in the relatively recent past. Lombardo et al.2 disagree and dispute our interpretation. They raise important questions which were addressed in our original paper albeit not in detail. Here, we expand on our previous analysis to estimate the land area and time needed to explain ADE formation through human inputs. This new analysis offers further support to our conclusion that indigenous peoples harnessed natural processes of elemental deposition, which led to the unique properties of ADEs, underscoring the need for a broader view of landscape evolution to redirect sustainable land use in the region. As explained in our study1, evidence from a single (albeit iconic) ADE site should not be extrapolated across the entire basin. However, our findings do raise general questions about previously proposed timing and mechanisms of ADE formation. We argue that our hypothesis should be tested in other sites through interdisciplinary research that combines indigenous knowledge, neotectonics, fluvial geomorphology, and a modern understanding of elemental cycling. Such an approach could uncover the mystery of ADE formation and guide the sustainable use of tropical landscapes going forward, hopefully leading to new discoveries of regional and global significance. MenosREPLYING to Lombardo et al. Nature Communications https://doi.org/10.1038/s41467-022-31064-2 (2022). Amazonian Dark Earths (ADEs) are widely regarded as a model for sustainable agriculture. Their unusual fertility and elevated concentration of charcoal, combined with the frequent occurrence of pre-Columbian artifacts at ADE sites, has prompted widespread biomass burning for soil amendment in tropical regions. However, it remains unclear how these persistent patches of high fertility could have been created in nutrient-impoverished tropical landscapes. In a recent study 1 , we report new data from one of the best-studied ADE sites in Brazil which warrant a revision of its origin story. We found large amounts of phosphorus (P) and calcium (Ca) correlated with 16 trace elements that indicate exogenous sources rather than in situ deposition, an inference that is supported by neodymium (Ne), strontium (Sr) and carbon (C) isotope signatures. Moreover, radiocarbon ( 14 C) activity of charcoal in ADEs suggested inputs beginning thousands of years before the earliest evidence of forest clearing for agriculture in the region. Our results imply that indigenous populations either managed soils at the site thousands of years earlier than previously reported or, alternatively, that human-derived inputs represent a small fraction of ADE’s chemical makeup, a fraction that, we hypothesise based on the size and timing of deposition (Fig. 1), was introduced in the relatively recent past. Lomba... Mostrar Tudo |
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Palavras-Chave: |
Terra Preta de Índio. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/doc/1144209/1/s41467-022-31065-1.pdf
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Marc: |
LEADER 03597naa a2200301 a 4500
001 2144209
005 2022-06-21
008 2022 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1038/s41467-022-31065-1$2DOI
100 1 $aSILVA, L. C. R.
245 $aReply to$bEvidence confirms an anthropic origin of Amazonian Dark Earths.$h[electronic resource]
260 $c2022
520 $aREPLYING to Lombardo et al. Nature Communications https://doi.org/10.1038/s41467-022-31064-2 (2022). Amazonian Dark Earths (ADEs) are widely regarded as a model for sustainable agriculture. Their unusual fertility and elevated concentration of charcoal, combined with the frequent occurrence of pre-Columbian artifacts at ADE sites, has prompted widespread biomass burning for soil amendment in tropical regions. However, it remains unclear how these persistent patches of high fertility could have been created in nutrient-impoverished tropical landscapes. In a recent study 1 , we report new data from one of the best-studied ADE sites in Brazil which warrant a revision of its origin story. We found large amounts of phosphorus (P) and calcium (Ca) correlated with 16 trace elements that indicate exogenous sources rather than in situ deposition, an inference that is supported by neodymium (Ne), strontium (Sr) and carbon (C) isotope signatures. Moreover, radiocarbon ( 14 C) activity of charcoal in ADEs suggested inputs beginning thousands of years before the earliest evidence of forest clearing for agriculture in the region. Our results imply that indigenous populations either managed soils at the site thousands of years earlier than previously reported or, alternatively, that human-derived inputs represent a small fraction of ADE’s chemical makeup, a fraction that, we hypothesise based on the size and timing of deposition (Fig. 1), was introduced in the relatively recent past. Lombardo et al.2 disagree and dispute our interpretation. They raise important questions which were addressed in our original paper albeit not in detail. Here, we expand on our previous analysis to estimate the land area and time needed to explain ADE formation through human inputs. This new analysis offers further support to our conclusion that indigenous peoples harnessed natural processes of elemental deposition, which led to the unique properties of ADEs, underscoring the need for a broader view of landscape evolution to redirect sustainable land use in the region. As explained in our study1, evidence from a single (albeit iconic) ADE site should not be extrapolated across the entire basin. However, our findings do raise general questions about previously proposed timing and mechanisms of ADE formation. We argue that our hypothesis should be tested in other sites through interdisciplinary research that combines indigenous knowledge, neotectonics, fluvial geomorphology, and a modern understanding of elemental cycling. Such an approach could uncover the mystery of ADE formation and guide the sustainable use of tropical landscapes going forward, hopefully leading to new discoveries of regional and global significance.
653 $aTerra Preta de Índio
700 1 $aCORRÊA, R. S.
700 1 $aWRIGHT, J. L.
700 1 $aBOMFIM, B.
700 1 $aHENDRICKS, L. B.
700 1 $aGAVIN, D. G.
700 1 $aMUNIZ, A. W.
700 1 $aMARTINS, G. C.
700 1 $aMOTTA, A. C. V.
700 1 $aBARBOSA, J. Z.
700 1 $aMELO, V. de F.
700 1 $aYOUNG, S. D.
700 1 $aBROADLEY, M. R.
700 1 $aSANTOS, R. V.
773 $tNature Communications$gv. 13, n. 3446, 2022.
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Embrapa Amazônia Ocidental (CPAA) |
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