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Registro Completo |
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Biblioteca(s): |
Embrapa Gado de Leite. |
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Data corrente: |
01/02/2016 |
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Data da última atualização: |
13/05/2025 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
NERI, H. L.; PALHAO, M. P.; COSTA, D. S.; VIANA, J. H. M.; FERNANDES, C. A. C. |
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Afiliação: |
H. L. Neri, UNIFENAS, MG; Hertape-Calier, Juatuba, MG; M. P. Palhao, UNIFENAS, MG; D. S. Costa, Universidade Federal do Mato Grosso do Sul; JOAO HENRIQUE MOREIRA VIANA, CNPGL; C. A. C. Fernandes, UNIFENAS. |
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Título: |
Endogenous progesterone concentrations affect progesterone release from intravaginal devices used for oestrous synchronization in cattle. |
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Ano de publicação: |
2015 |
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Fonte/Imprenta: |
Reproduction in Domestic Animals, v. 50, n. 4, p. 692-695, 2015. |
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Idioma: |
Inglês |
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Conteúdo: |
Intravaginal progesterone-releasing devices are largely used both as contraceptives in humans and as a component of oestrous synchronization protocols in cattle. To reduce costs in large-scale timed artificial insemination, the reuse of these releasing devices is common. Passive hormone diffusion, however, depends on the concentration gradient, which could affect the amount of residual progesterone present in these devices after a first use. To evaluate the effect of the presence of a corpus luteum in the release of progesterone from intravaginal devices, three synchronization protocols were designed to simulate the effects of inserting the device in the early dioestrus, late dioestrus or anoestrus. Holstein-Zebu cross-bred heifers were randomly allocated into one of these three treatments, and a series of blood samples was taken to evaluate the plasma progesterone concentrations. After 8 days, the intravaginal devices were removed and underwent a previously validated alcoholic extraction technique to measure the residual progesterone. Non-used devices were used as controls. As expected, the simultaneous presence of the intravaginal device and a corpus luteum resulted in increased plasma progesterone concentrations. Conversely, the amount of residual progesterone in the devices after use was inversely proportional to the plasma progesterone concentration. These results demonstrate that the release rate of progesterone from intravaginal devices is affected by the endogenous concentration of this hormone; consequently, the strategy for reuse should account for the category and expected luteal cyclic activity of the animals undergoing synchronization protocols. MenosIntravaginal progesterone-releasing devices are largely used both as contraceptives in humans and as a component of oestrous synchronization protocols in cattle. To reduce costs in large-scale timed artificial insemination, the reuse of these releasing devices is common. Passive hormone diffusion, however, depends on the concentration gradient, which could affect the amount of residual progesterone present in these devices after a first use. To evaluate the effect of the presence of a corpus luteum in the release of progesterone from intravaginal devices, three synchronization protocols were designed to simulate the effects of inserting the device in the early dioestrus, late dioestrus or anoestrus. Holstein-Zebu cross-bred heifers were randomly allocated into one of these three treatments, and a series of blood samples was taken to evaluate the plasma progesterone concentrations. After 8 days, the intravaginal devices were removed and underwent a previously validated alcoholic extraction technique to measure the residual progesterone. Non-used devices were used as controls. As expected, the simultaneous presence of the intravaginal device and a corpus luteum resulted in increased plasma progesterone concentrations. Conversely, the amount of residual progesterone in the devices after use was inversely proportional to the plasma progesterone concentration. These results demonstrate that the release rate of progesterone from intravaginal devices is affected by the endogenous c... Mostrar Tudo |
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Palavras-Chave: |
Oestrous synchronization. |
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Thesaurus Nal: |
animal reproduction; progesterone. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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URL: |
https://www.alice.cnptia.embrapa.br/alice/bitstream/doc/1035687/1/Cnpgl2015RepDomAnEndogenous.pdf
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Marc: |
LEADER 02365naa a2200205 a 4500
001 2035687
005 2025-05-13
008 2015 bl uuuu u00u1 u #d
100 1 $aNERI, H. L.
245 $aEndogenous progesterone concentrations affect progesterone release from intravaginal devices used for oestrous synchronization in cattle.$h[electronic resource]
260 $c2015
520 $aIntravaginal progesterone-releasing devices are largely used both as contraceptives in humans and as a component of oestrous synchronization protocols in cattle. To reduce costs in large-scale timed artificial insemination, the reuse of these releasing devices is common. Passive hormone diffusion, however, depends on the concentration gradient, which could affect the amount of residual progesterone present in these devices after a first use. To evaluate the effect of the presence of a corpus luteum in the release of progesterone from intravaginal devices, three synchronization protocols were designed to simulate the effects of inserting the device in the early dioestrus, late dioestrus or anoestrus. Holstein-Zebu cross-bred heifers were randomly allocated into one of these three treatments, and a series of blood samples was taken to evaluate the plasma progesterone concentrations. After 8 days, the intravaginal devices were removed and underwent a previously validated alcoholic extraction technique to measure the residual progesterone. Non-used devices were used as controls. As expected, the simultaneous presence of the intravaginal device and a corpus luteum resulted in increased plasma progesterone concentrations. Conversely, the amount of residual progesterone in the devices after use was inversely proportional to the plasma progesterone concentration. These results demonstrate that the release rate of progesterone from intravaginal devices is affected by the endogenous concentration of this hormone; consequently, the strategy for reuse should account for the category and expected luteal cyclic activity of the animals undergoing synchronization protocols.
650 $aanimal reproduction
650 $aprogesterone
653 $aOestrous synchronization
700 1 $aPALHAO, M. P.
700 1 $aCOSTA, D. S.
700 1 $aVIANA, J. H. M.
700 1 $aFERNANDES, C. A. C.
773 $tReproduction in Domestic Animals$gv. 50, n. 4, p. 692-695, 2015.
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Registro original: |
Embrapa Gado de Leite (CNPGL) |
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