| |
|
|
 | Acesso ao texto completo restrito à biblioteca da Embrapa Caprinos e Ovinos. Para informações adicionais entre em contato com cnpc.biblioteca@embrapa.br. |
|
Registro Completo |
|
Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
|
Data corrente: |
01/08/1992 |
|
Data da última atualização: |
29/11/2023 |
|
Autoria: |
ALLEN, D. M.; LAMMING, G. E. |
|
Título: |
The induction of breeding activity in lactating ewes during anoestrus. |
|
Ano de publicação: |
1960 |
|
Fonte/Imprenta: |
Journal of Reproduction and Fertility, v. 1, n. 3, p. 213-222, Aug. 1960. |
|
DOI: |
https://doi.org/10.1530/jrf.0.0010213 |
|
Idioma: |
Inglês |
|
Conteúdo: |
Abstract: Forty lactating ewes were used in experiments to compare reproductive phenomena when they were slaughtered : (1) during normal anoestrus (Control), (2) after breeding activity had been induced by a series of three intra-muscular injections of 50 mg of progesterone (in oil) at 3-day intervals, followed after 48 hr by a subcutaneous injection of 750 i.u. of PMS, (3) after breeding activity had been induced, in response to the animals' endogenous endocrine secretions, by artificially manipulating the diurnal light : dark ratio. Untreated control ewes showed no evidence of recent ovulations but a degree of ovarian activity was present as measured by the number of medium- and large-sized ovarian follicles. Injections of progesterone and PMS induced ovulation in nineteen of the twenty ewes treated and oestrus accompanied ovulation in twelve ewes. However, in ewes which mated there was a complete failure of fertilization which could not be attributed to poor semen quality. Manipulation of the diurnal light : dark ratio induced ovulation in all ten treated ewes and oestrus was observed in nine ewes. Oestrus was preceded by a `silent heat'. The response to this form of treatment was slow but uniform. Of the ova recovered 41.2 % were cleaving. A semi-quantitative estimate of the potency of total gonadotrophin in the anterior pituitary gland indicated a significantly higher level of gonadotrophin in untreated control ewes than in ewes which ovulated, suggesting that both forms of treatment induced a release of gonadotrophin from the anterior pituitary gland. The results are briefly discussed. MenosAbstract: Forty lactating ewes were used in experiments to compare reproductive phenomena when they were slaughtered : (1) during normal anoestrus (Control), (2) after breeding activity had been induced by a series of three intra-muscular injections of 50 mg of progesterone (in oil) at 3-day intervals, followed after 48 hr by a subcutaneous injection of 750 i.u. of PMS, (3) after breeding activity had been induced, in response to the animals' endogenous endocrine secretions, by artificially manipulating the diurnal light : dark ratio. Untreated control ewes showed no evidence of recent ovulations but a degree of ovarian activity was present as measured by the number of medium- and large-sized ovarian follicles. Injections of progesterone and PMS induced ovulation in nineteen of the twenty ewes treated and oestrus accompanied ovulation in twelve ewes. However, in ewes which mated there was a complete failure of fertilization which could not be attributed to poor semen quality. Manipulation of the diurnal light : dark ratio induced ovulation in all ten treated ewes and oestrus was observed in nine ewes. Oestrus was preceded by a `silent heat'. The response to this form of treatment was slow but uniform. Of the ova recovered 41.2 % were cleaving. A semi-quantitative estimate of the potency of total gonadotrophin in the anterior pituitary gland indicated a significantly higher level of gonadotrophin in untreated control ewes than in ewes which ovulated, suggesting that both form... Mostrar Tudo |
|
Thesagro: |
Ciclo Estral; Lactação; Ovelha; Ovino; Reprodução; Sincronização do Cio. |
|
Thesaurus Nal: |
Estrous cycle; Lactation; Progesterone; Reproduction; Sheep. |
|
Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
|
Marc: |
LEADER 02402naa a2200277 a 4500
001 1521910
005 2023-11-29
008 1960 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1530/jrf.0.0010213$2DOI
100 1 $aALLEN, D. M.
245 $aThe induction of breeding activity in lactating ewes during anoestrus.$h[electronic resource]
260 $c1960
520 $aAbstract: Forty lactating ewes were used in experiments to compare reproductive phenomena when they were slaughtered : (1) during normal anoestrus (Control), (2) after breeding activity had been induced by a series of three intra-muscular injections of 50 mg of progesterone (in oil) at 3-day intervals, followed after 48 hr by a subcutaneous injection of 750 i.u. of PMS, (3) after breeding activity had been induced, in response to the animals' endogenous endocrine secretions, by artificially manipulating the diurnal light : dark ratio. Untreated control ewes showed no evidence of recent ovulations but a degree of ovarian activity was present as measured by the number of medium- and large-sized ovarian follicles. Injections of progesterone and PMS induced ovulation in nineteen of the twenty ewes treated and oestrus accompanied ovulation in twelve ewes. However, in ewes which mated there was a complete failure of fertilization which could not be attributed to poor semen quality. Manipulation of the diurnal light : dark ratio induced ovulation in all ten treated ewes and oestrus was observed in nine ewes. Oestrus was preceded by a `silent heat'. The response to this form of treatment was slow but uniform. Of the ova recovered 41.2 % were cleaving. A semi-quantitative estimate of the potency of total gonadotrophin in the anterior pituitary gland indicated a significantly higher level of gonadotrophin in untreated control ewes than in ewes which ovulated, suggesting that both forms of treatment induced a release of gonadotrophin from the anterior pituitary gland. The results are briefly discussed.
650 $aEstrous cycle
650 $aLactation
650 $aProgesterone
650 $aReproduction
650 $aSheep
650 $aCiclo Estral
650 $aLactação
650 $aOvelha
650 $aOvino
650 $aReprodução
650 $aSincronização do Cio
700 1 $aLAMMING, G. E.
773 $tJournal of Reproduction and Fertility$gv. 1, n. 3, p. 213-222, Aug. 1960.
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Caprinos e Ovinos (CNPC) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
Voltar
|
|
|
| Registros recuperados : 1 | |
| 1. |  | REIS, K. G.; NUNES, G. H. F.; VALICENTE, F. H.; AGUIAR, F. M.; PINHO, J. M. R.; CARVALHO, K. S.; SANTOS, V. A. S.; EVANGELISTA, N. A. M.; VIEIRA, C. G.; SOUZA, O. S. Interferência do Baculovírus (SfMNPV) no canibalismo de Spodoptera frugiperda em sistema de criação Karolay. In: SIMPÓSIO DE CONTROLE BIOLÓGICO, 16., 2019, Londrina. Controle biológico: da academia ao campo, rumo à sustentabilidade: anais. Londrina: Sociedade Entomológica do Brasil, 2019. p. 119. Siconbiol.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Milho e Sorgo. |
|    |
| Registros recuperados : 1 | |
|
| Nenhum registro encontrado para a expressão de busca informada. |
|
|
