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 | Acesso ao texto completo restrito à biblioteca da Embrapa Caprinos e Ovinos. Para informações adicionais entre em contato com cnpc.biblioteca@embrapa.br. |
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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: |
22/05/2023 |
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Autoria: |
FLETCHER, I. C.; LINDSAY, D. R. |
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Título: |
Effect of oestrogen on oestrous behaviour and its variation with season in the ewe. |
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Ano de publicação: |
1971 |
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Fonte/Imprenta: |
Journal Endocrinology, v. 50, p. 685-696, Aug., 1971. |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: The effects of dose of oestrogen and season on the expression of oestrous behaviour was studied in 60 spayed and 16 intact ewes. In progesterone-primed spayed ewes the incidence and duration of oestrous behaviour increased and the interval between injection of oestrogen, and onset of oestrous behaviour decreased as the dose of oestrogen was increased. The linear regression of duration of oestrus on log dose of injected oestrogen provided the most precise measure of the effect of changing dose level of oestrogen on oestrous behaviour. The sensitivity of spayed ewes to constant levels of oestrogen increased to a maximum near the middle of the breeding season and then declined to a minimum during the non-breeding season. In progesterone-synchronized intact ewes the interval between the end of progesterone treatment and onset of oestrus was at a minimum, and duration of oestrus at a maximum, near the middle of the breeding season. By bioassay it was estimated that endogenous oestrogen production was greater near the middle of the breeding season than at either the beginning or end. It is concluded that seasonal variation in the expression of oestrous behaviour in intact ewes is controlled by changes in both the production of endogenous oestrogen and the sensitivity of ewes to it. |
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Palavras-Chave: |
Estro. |
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Thesagro: |
Endocrinologia; Estrógeno; Hormônio; Ovino; Reprodução. |
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Thesaurus Nal: |
Endocrinology; Estrogens; Ewes; Reproduction; Sheep. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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Marc: |
LEADER 02007naa a2200265 a 4500
001 1520038
005 2023-05-22
008 1971 bl uuuu u00u1 u #d
100 1 $aFLETCHER, I. C.
245 $aEffect of oestrogen on oestrous behaviour and its variation with season in the ewe.$h[electronic resource]
260 $c1971
520 $aAbstract: The effects of dose of oestrogen and season on the expression of oestrous behaviour was studied in 60 spayed and 16 intact ewes. In progesterone-primed spayed ewes the incidence and duration of oestrous behaviour increased and the interval between injection of oestrogen, and onset of oestrous behaviour decreased as the dose of oestrogen was increased. The linear regression of duration of oestrus on log dose of injected oestrogen provided the most precise measure of the effect of changing dose level of oestrogen on oestrous behaviour. The sensitivity of spayed ewes to constant levels of oestrogen increased to a maximum near the middle of the breeding season and then declined to a minimum during the non-breeding season. In progesterone-synchronized intact ewes the interval between the end of progesterone treatment and onset of oestrus was at a minimum, and duration of oestrus at a maximum, near the middle of the breeding season. By bioassay it was estimated that endogenous oestrogen production was greater near the middle of the breeding season than at either the beginning or end. It is concluded that seasonal variation in the expression of oestrous behaviour in intact ewes is controlled by changes in both the production of endogenous oestrogen and the sensitivity of ewes to it.
650 $aEndocrinology
650 $aEstrogens
650 $aEwes
650 $aReproduction
650 $aSheep
650 $aEndocrinologia
650 $aEstrógeno
650 $aHormônio
650 $aOvino
650 $aReprodução
653 $aEstro
700 1 $aLINDSAY, D. R.
773 $tJournal Endocrinology$gv. 50, p. 685-696, Aug., 1971.
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| 1. |  | MEDEIROS, R. L. S.; SOUZA, V. C. de; BARBOSA NETO, M. A.; ARAÚJO, L. de; BARBOSA, A. de S.; MEDEIROS, R. L. S. de. Estrutura da regeneração natural de Anadenanthera colubrina em fragmento de brejo de altitude em Bananeiras, PB. Pesquisa Florestal Brasileira, Colombo, v. 36, n. 86, p. 95-101, abr./jun. 2016.| Biblioteca(s): Embrapa Florestas. |
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