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Registro Completo |
Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
Data corrente: |
25/09/2000 |
Data da última atualização: |
11/08/2023 |
Autoria: |
GIBBONS, J. R.; KOT, K.; THOMAS, D. L.; WILTBANK, M. C.; GINTHER, O. J. |
Título: |
Follicular and FSH dynamics in ewes with a history of high and low ovulation rates. |
Ano de publicação: |
1999 |
Fonte/Imprenta: |
Theriogenology, v. 52, n. 6, p. 1005-1020, Oct. 1999. |
Idioma: |
Inglês |
Conteúdo: |
Abstract: Daily transrectal ultrasound scanning and twice-daily blood sampling were used to monitor the temporal relationships between FSH concentrations and follicle development during complete interovulatory intervals for ewes in which the ovulation rate in each of the 2 previous years was high or low (?3 and ?2 ovulations, respectively). Follicles that reached ?5 mm were used to define a follicular wave and were tracked retrospectively to 3 mm (emergence). The hypothesis that FSH surges (identified with a computer program) and follicular waves (retrospectively determined based on ultrasound scanning) are temporally associated was supported in both groups by the emergence of an anovulatory or ovulatory follicular wave near the peak of an FSH surge. Further support for the hypothesis was a significant increase in FSH concentrations before and a significant decrease after follicular-wave emergence in both groups independent of the identification of FSH surges. Ewes with a history of high ovulation rates had smaller follicles (anovulatory and ovulatory) and more ovulations, but the 2 groups were similar in the number of ovulatory follicular waves and associated FSH surges, number and characteristics of the FSH surges, and mean FSH concentrations per interovulatory interval. Surges of FSH were periodic (every 3 or 4 d) regardless of the ovulation-rate group or follicle response. In ewes with a low ovulation rate, the nonovulatory FSH surges were most frequently associated with emergence of detected anovulatory follicular waves. In ewes with a high ovulation rate, more FSH surges were not associated with a detected follicular wave, as defined, presumably because the largest follicle did not reach 5 mm. The results indicated that the factors resulting in a high ovulation rate were not exerted through circulatory patterns or concentrations of FSH but involved a shorter growth phase and smaller maximal diameter of follicles. MenosAbstract: Daily transrectal ultrasound scanning and twice-daily blood sampling were used to monitor the temporal relationships between FSH concentrations and follicle development during complete interovulatory intervals for ewes in which the ovulation rate in each of the 2 previous years was high or low (?3 and ?2 ovulations, respectively). Follicles that reached ?5 mm were used to define a follicular wave and were tracked retrospectively to 3 mm (emergence). The hypothesis that FSH surges (identified with a computer program) and follicular waves (retrospectively determined based on ultrasound scanning) are temporally associated was supported in both groups by the emergence of an anovulatory or ovulatory follicular wave near the peak of an FSH surge. Further support for the hypothesis was a significant increase in FSH concentrations before and a significant decrease after follicular-wave emergence in both groups independent of the identification of FSH surges. Ewes with a history of high ovulation rates had smaller follicles (anovulatory and ovulatory) and more ovulations, but the 2 groups were similar in the number of ovulatory follicular waves and associated FSH surges, number and characteristics of the FSH surges, and mean FSH concentrations per interovulatory interval. Surges of FSH were periodic (every 3 or 4 d) regardless of the ovulation-rate group or follicle response. In ewes with a low ovulation rate, the nonovulatory FSH surges were most frequently associated with... Mostrar Tudo |
Palavras-Chave: |
Dinamica folicular; FSH; LH; Ovary; Taxa de ovulacao. |
Thesagro: |
Ovino. |
Thesaurus Nal: |
Anovulation; Females; Follicle-stimulating hormone; Ovulation; Physiology; Reproduction; Seasons; Sheep; Ultrasonography. |
Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
Marc: |
LEADER 02861naa a2200349 a 4500 001 1524150 005 2023-08-11 008 1999 bl uuuu u00u1 u #d 100 1 $aGIBBONS, J. R. 245 $aFollicular and FSH dynamics in ewes with a history of high and low ovulation rates.$h[electronic resource] 260 $c1999 520 $aAbstract: Daily transrectal ultrasound scanning and twice-daily blood sampling were used to monitor the temporal relationships between FSH concentrations and follicle development during complete interovulatory intervals for ewes in which the ovulation rate in each of the 2 previous years was high or low (?3 and ?2 ovulations, respectively). Follicles that reached ?5 mm were used to define a follicular wave and were tracked retrospectively to 3 mm (emergence). The hypothesis that FSH surges (identified with a computer program) and follicular waves (retrospectively determined based on ultrasound scanning) are temporally associated was supported in both groups by the emergence of an anovulatory or ovulatory follicular wave near the peak of an FSH surge. Further support for the hypothesis was a significant increase in FSH concentrations before and a significant decrease after follicular-wave emergence in both groups independent of the identification of FSH surges. Ewes with a history of high ovulation rates had smaller follicles (anovulatory and ovulatory) and more ovulations, but the 2 groups were similar in the number of ovulatory follicular waves and associated FSH surges, number and characteristics of the FSH surges, and mean FSH concentrations per interovulatory interval. Surges of FSH were periodic (every 3 or 4 d) regardless of the ovulation-rate group or follicle response. In ewes with a low ovulation rate, the nonovulatory FSH surges were most frequently associated with emergence of detected anovulatory follicular waves. In ewes with a high ovulation rate, more FSH surges were not associated with a detected follicular wave, as defined, presumably because the largest follicle did not reach 5 mm. The results indicated that the factors resulting in a high ovulation rate were not exerted through circulatory patterns or concentrations of FSH but involved a shorter growth phase and smaller maximal diameter of follicles. 650 $aAnovulation 650 $aFemales 650 $aFollicle-stimulating hormone 650 $aOvulation 650 $aPhysiology 650 $aReproduction 650 $aSeasons 650 $aSheep 650 $aUltrasonography 650 $aOvino 653 $aDinamica folicular 653 $aFSH 653 $aLH 653 $aOvary 653 $aTaxa de ovulacao 700 1 $aKOT, K. 700 1 $aTHOMAS, D. L. 700 1 $aWILTBANK, M. C. 700 1 $aGINTHER, O. J. 773 $tTheriogenology$gv. 52, n. 6, p. 1005-1020, Oct. 1999.
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Embrapa Caprinos e Ovinos (CNPC) |
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| Acesso ao texto completo restrito à biblioteca da Embrapa Acre. Para informações adicionais entre em contato com cpafac.biblioteca@embrapa.br. |
Registro Completo
Biblioteca(s): |
Embrapa Acre. |
Data corrente: |
16/01/2008 |
Data da última atualização: |
10/11/2023 |
Tipo da produção científica: |
Artigo em Anais de Congresso |
Autoria: |
PEREIRA, J. E. S.; MACIEL, S. de A.; FERMINO JÚNIOR, P. C. P. |
Afiliação: |
JONNY EVERSON SCHERWINSKI PEREIRA, CPAF-AC; SIMONE DE ALENCAR MACIEL, CNPq; PAULO CESAR POETA FERMINO JÚNIOR, UFAC. |
Título: |
Indução da embriogênese somática em pupunheira (Bactris gasipaes H. B. K.) a partir de embriões zigóticos imaturos. |
Ano de publicação: |
2007 |
Fonte/Imprenta: |
In: CONGRESSO BRASILEIRO DE FLORICULTURA E PLANTAS ORNAMENTAIS, 16.; CONGRESSO BRASILEIRO DE CULTURA DE TECIDOS DE PLANTAS, 3.; SIMPÓSIO DE PLANTAS ORNAMENTAIS NATIVAS, 1., 2007, Goiânia. Biodiversidade e competitividade: buscando novas opções: anais. Campinas: Sociedade Brasileira de Floricultura e Plantas Ornamentais, 2007. |
Páginas: |
p. 849-852. |
Idioma: |
Português |
Palavras-Chave: |
Embrião somático; Embrião zigótico. |
Thesagro: |
Pupunha. |
Categoria do assunto: |
-- |
Marc: |
LEADER 00861nam a2200169 a 4500 001 1505798 005 2023-11-10 008 2007 bl uuuu u00u1 u #d 100 1 $aPEREIRA, J. E. S. 245 $aIndução da embriogênese somática em pupunheira (Bactris gasipaes H. B. K.) a partir de embriões zigóticos imaturos.$h[electronic resource] 260 $aIn: CONGRESSO BRASILEIRO DE FLORICULTURA E PLANTAS ORNAMENTAIS, 16.; CONGRESSO BRASILEIRO DE CULTURA DE TECIDOS DE PLANTAS, 3.; SIMPÓSIO DE PLANTAS ORNAMENTAIS NATIVAS, 1., 2007, Goiânia. Biodiversidade e competitividade: buscando novas opções: anais. Campinas: Sociedade Brasileira de Floricultura e Plantas Ornamentais$c2007 300 $ap. 849-852. 650 $aPupunha 653 $aEmbrião somático 653 $aEmbrião zigótico 700 1 $aMACIEL, S. de A. 700 1 $aFERMINO JÚNIOR, P. C. P.
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