| |
|
|
 | 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: |
15/02/1996 |
|
Data da última atualização: |
07/11/2023 |
|
Autoria: |
CASIDA, L. E.; WARWICK, E. J.; MEYER, R. K. |
|
Título: |
Survival of multiple pregnancies induced in the ewe following treatment with pituitary gonadotropins |
|
Ano de publicação: |
1944 |
|
Fonte/Imprenta: |
Journal of Animal Science, v. 3, n. 1, p. 22-28, Feb. 1944. |
|
Idioma: |
Inglês |
|
Conteúdo: |
Abstract: Follicle-stimulating and luteinizing extracts of sheep pituitary powder have been used to induce superovulation in 25 ewes. Treatment began the twelfth day of the estrous cycle and terminated five days later at the time of natural estrus. All ewes were mated or artificially inseminated. The viability of the artificially induced multiple pregnancies was checked by observations on different animals at 2 to 5 days, 14 to 27 days, and 30 to 37 days. The numbers of ewes found to be pregnant at the different intervals were 6 of 7, 8 of 10, and 5 of 8, respectively. An average of 9.2 nomral embryos per ewe, representing 70% of the eggs ovulated, was found in the first period, 3.4 in the second period, and 0.8 in the third. Many dead and degenerate embryos were found in the later stages. The corpora lutea numbers of 20.8, 23.2, and 24.6 for the three groups were essentially the same, and it is believed that the initial ovulation and fertilization rates were comparable. Two possible causes of death are suggested: (1) inadequate uterine environment due either to a direct or an indirect effect of treatment, or (2) abnormalities induced in the ova by the rapid maturation of follicles. In an attempt to obtain information on the cause of death 26 fertilized ova from treated ewes were transplanted to normal ewes at comparable stages of the estrous cycle. Only three of these survived long enough to interrupt the estrous cycle of the host ewes, but the efficiency of the transplantation technique is unknown, so no conclusion as to their viability is possible. MenosAbstract: Follicle-stimulating and luteinizing extracts of sheep pituitary powder have been used to induce superovulation in 25 ewes. Treatment began the twelfth day of the estrous cycle and terminated five days later at the time of natural estrus. All ewes were mated or artificially inseminated. The viability of the artificially induced multiple pregnancies was checked by observations on different animals at 2 to 5 days, 14 to 27 days, and 30 to 37 days. The numbers of ewes found to be pregnant at the different intervals were 6 of 7, 8 of 10, and 5 of 8, respectively. An average of 9.2 nomral embryos per ewe, representing 70% of the eggs ovulated, was found in the first period, 3.4 in the second period, and 0.8 in the third. Many dead and degenerate embryos were found in the later stages. The corpora lutea numbers of 20.8, 23.2, and 24.6 for the three groups were essentially the same, and it is believed that the initial ovulation and fertilization rates were comparable. Two possible causes of death are suggested: (1) inadequate uterine environment due either to a direct or an indirect effect of treatment, or (2) abnormalities induced in the ova by the rapid maturation of follicles. In an attempt to obtain information on the cause of death 26 fertilized ova from treated ewes were transplanted to normal ewes at comparable stages of the estrous cycle. Only three of these survived long enough to interrupt the estrous cycle of the host ewes, but the efficiency of the transplanta... Mostrar Tudo |
|
Palavras-Chave: |
Inducao hormonal. |
|
Thesagro: |
Ovino; Prenhez; Reprodução; Superovulação. |
|
Thesaurus Nal: |
Ewes; Follicle-stimulating hormone; Ovulation; Pregnancy; Reproduction; Sheep; Superovulation. |
|
Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
|
Marc: |
LEADER 02383naa a2200289 a 4500
001 1522981
005 2023-11-07
008 1944 bl uuuu u00u1 u #d
100 1 $aCASIDA, L. E.
245 $aSurvival of multiple pregnancies induced in the ewe following treatment with pituitary gonadotropins$h[electronic resource]
260 $c1944
520 $aAbstract: Follicle-stimulating and luteinizing extracts of sheep pituitary powder have been used to induce superovulation in 25 ewes. Treatment began the twelfth day of the estrous cycle and terminated five days later at the time of natural estrus. All ewes were mated or artificially inseminated. The viability of the artificially induced multiple pregnancies was checked by observations on different animals at 2 to 5 days, 14 to 27 days, and 30 to 37 days. The numbers of ewes found to be pregnant at the different intervals were 6 of 7, 8 of 10, and 5 of 8, respectively. An average of 9.2 nomral embryos per ewe, representing 70% of the eggs ovulated, was found in the first period, 3.4 in the second period, and 0.8 in the third. Many dead and degenerate embryos were found in the later stages. The corpora lutea numbers of 20.8, 23.2, and 24.6 for the three groups were essentially the same, and it is believed that the initial ovulation and fertilization rates were comparable. Two possible causes of death are suggested: (1) inadequate uterine environment due either to a direct or an indirect effect of treatment, or (2) abnormalities induced in the ova by the rapid maturation of follicles. In an attempt to obtain information on the cause of death 26 fertilized ova from treated ewes were transplanted to normal ewes at comparable stages of the estrous cycle. Only three of these survived long enough to interrupt the estrous cycle of the host ewes, but the efficiency of the transplantation technique is unknown, so no conclusion as to their viability is possible.
650 $aEwes
650 $aFollicle-stimulating hormone
650 $aOvulation
650 $aPregnancy
650 $aReproduction
650 $aSheep
650 $aSuperovulation
650 $aOvino
650 $aPrenhez
650 $aReprodução
650 $aSuperovulação
653 $aInducao hormonal
700 1 $aWARWICK, E. J.
700 1 $aMEYER, R. K.
773 $tJournal of Animal Science$gv. 3, n. 1, p. 22-28, Feb. 1944.
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 | |
| Registros recuperados : 1 | |
|
| Nenhum registro encontrado para a expressão de busca informada. |
|
|
