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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
31/10/2002 |
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Data da última atualização: |
31/10/2002 |
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Autoria: |
DRIANCOURT, M. A.; FÉVRE, J.; MARTAL, J.; AL-GUBORY, K. H. |
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Título: |
Control of ovarian follicular growth and maturation by the corpus luteum and the placenta during pregnancy in sheep. |
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Ano de publicação: |
2000 |
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Fonte/Imprenta: |
Journal of Reproduction and Fertility, v. 120, n. 1, p. 151-158, 2000. |
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Idioma: |
Inglês |
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Conteúdo: |
Ovarian follicular growth and maturation and its control throughout pregnancy have not been described fully in sheep. Experiment 1 characterized the size and maturation (steroid production in vitro and aromatase activity) of ovarian follicles obtained at days 20, 50, 80 and 110 of pregnancy compared with those obtained at day 12 of the oestrous cycle. There was no difference in the number of small follicles « 3 mm in diameter) between cyclic and pregnant ewes, regardless of the stage of pregnancy. There was a marked reduction (P < 0.01) in the number of medium follicles (3-5 mm) starting at day 80 of pregnancy. Large follicles (> 5 mm) were not detected at day 110 of pregnancy. In vitro testosterone output by follicles was constant throughout pregnancy. Oestradiol t output remained steady until day 80, but decreased markedly at day 110 of pregnancy. This decrease was associated with a reduction in aromatase activity in follicles obtained r: at this stage. Experiment 2 examined the effect of administration of high concentrations of progesterone between day 100 and day 120 after mating on resumption of follicular r growth in ewes that underwent Caesarean section at day 99 of pregnancy. In ewes that underwent Caesarean section, progesterone supplementation was successful in mimicking the profile found in pregnant ewes, but did not prevent re-initiation of follicular growth, as demonstrated by the presence of large follicles (> 5 mm) at day 120 after mating. Experiment 3 examined the effects of PGF 2alpha-induced regression of the corpus luteum of day 100 of pregnancy on resumption of follicular growth. High concentrations of PGF2alpha (0.28 mg kg-l body weight) administrated at day 100 of pregnancy were required to initiate regression of the corpus luteum. At day 120 after mating, the mean (+- SEM) diameter of the largest follicle in PGF2alpha-treated ewes (3.40 :t 0.47 mm) was significantly greater (P < 0.05) than that in control pregnant ewes (2.52 +- 0.34 mm). Experiment 4 examined the effect of removal of the fetus and of the corpus luteum at day 100 of pregnancy on resumption of ovulation. Removal of the corpus luteum by PGF 2alpha treatment at the time of removal of the fetus resulted in earlier occurrence of short luteal phases (27.8 versus 40.6 days, PGF2alpha-treated versus non-treated) but did not alter the timing of the first normal luteal phases (41 days). In conclusion, the results from these experiments indicate that placental compounds play a major role in inhibiting follicular growth and maturation during late pregnancy in sheep. MenosOvarian follicular growth and maturation and its control throughout pregnancy have not been described fully in sheep. Experiment 1 characterized the size and maturation (steroid production in vitro and aromatase activity) of ovarian follicles obtained at days 20, 50, 80 and 110 of pregnancy compared with those obtained at day 12 of the oestrous cycle. There was no difference in the number of small follicles « 3 mm in diameter) between cyclic and pregnant ewes, regardless of the stage of pregnancy. There was a marked reduction (P < 0.01) in the number of medium follicles (3-5 mm) starting at day 80 of pregnancy. Large follicles (> 5 mm) were not detected at day 110 of pregnancy. In vitro testosterone output by follicles was constant throughout pregnancy. Oestradiol t output remained steady until day 80, but decreased markedly at day 110 of pregnancy. This decrease was associated with a reduction in aromatase activity in follicles obtained r: at this stage. Experiment 2 examined the effect of administration of high concentrations of progesterone between day 100 and day 120 after mating on resumption of follicular r growth in ewes that underwent Caesarean section at day 99 of pregnancy. In ewes that underwent Caesarean section, progesterone supplementation was successful in mimicking the profile found in pregnant ewes, but did not prevent re-initiation of follicular growth, as demonstrated by the presence of large follicles (> 5 mm) at day 120 after mating. Experiment 3 examine... Mostrar Tudo |
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Palavras-Chave: |
Hormônio de crescimento. |
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Thesagro: |
Ovino; Placenta; Prenhez. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 03210naa a2200205 a 4500
001 1528792
005 2002-10-31
008 2000 bl uuuu u00u1 u #d
100 1 $aDRIANCOURT, M. A.
245 $aControl of ovarian follicular growth and maturation by the corpus luteum and the placenta during pregnancy in sheep.
260 $c2000
520 $aOvarian follicular growth and maturation and its control throughout pregnancy have not been described fully in sheep. Experiment 1 characterized the size and maturation (steroid production in vitro and aromatase activity) of ovarian follicles obtained at days 20, 50, 80 and 110 of pregnancy compared with those obtained at day 12 of the oestrous cycle. There was no difference in the number of small follicles « 3 mm in diameter) between cyclic and pregnant ewes, regardless of the stage of pregnancy. There was a marked reduction (P < 0.01) in the number of medium follicles (3-5 mm) starting at day 80 of pregnancy. Large follicles (> 5 mm) were not detected at day 110 of pregnancy. In vitro testosterone output by follicles was constant throughout pregnancy. Oestradiol t output remained steady until day 80, but decreased markedly at day 110 of pregnancy. This decrease was associated with a reduction in aromatase activity in follicles obtained r: at this stage. Experiment 2 examined the effect of administration of high concentrations of progesterone between day 100 and day 120 after mating on resumption of follicular r growth in ewes that underwent Caesarean section at day 99 of pregnancy. In ewes that underwent Caesarean section, progesterone supplementation was successful in mimicking the profile found in pregnant ewes, but did not prevent re-initiation of follicular growth, as demonstrated by the presence of large follicles (> 5 mm) at day 120 after mating. Experiment 3 examined the effects of PGF 2alpha-induced regression of the corpus luteum of day 100 of pregnancy on resumption of follicular growth. High concentrations of PGF2alpha (0.28 mg kg-l body weight) administrated at day 100 of pregnancy were required to initiate regression of the corpus luteum. At day 120 after mating, the mean (+- SEM) diameter of the largest follicle in PGF2alpha-treated ewes (3.40 :t 0.47 mm) was significantly greater (P < 0.05) than that in control pregnant ewes (2.52 +- 0.34 mm). Experiment 4 examined the effect of removal of the fetus and of the corpus luteum at day 100 of pregnancy on resumption of ovulation. Removal of the corpus luteum by PGF 2alpha treatment at the time of removal of the fetus resulted in earlier occurrence of short luteal phases (27.8 versus 40.6 days, PGF2alpha-treated versus non-treated) but did not alter the timing of the first normal luteal phases (41 days). In conclusion, the results from these experiments indicate that placental compounds play a major role in inhibiting follicular growth and maturation during late pregnancy in sheep.
650 $aOvino
650 $aPlacenta
650 $aPrenhez
653 $aHormônio de crescimento
700 1 $aFÉVRE, J.
700 1 $aMARTAL, J.
700 1 $aAL-GUBORY, K. H.
773 $tJournal of Reproduction and Fertility$gv. 120, n. 1, p. 151-158, 2000.
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Registro original: |
Embrapa Caprinos e Ovinos (CNPC) |
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Registro Completo
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Biblioteca(s): |
Embrapa Mandioca e Fruticultura. |
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Data corrente: |
25/08/2011 |
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Data da última atualização: |
19/10/2011 |
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Tipo da produção científica: |
Artigo em Anais de Congresso |
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Autoria: |
SILVEIRA, F. G. F. da; SOUZA, L. da S.; OLIVEIRA, A. S. de; SOUZA, L. D.; PEREIRA, F. A. de C.; SILVA, F. T. dos S. |
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Afiliação: |
FELIPE GOMES FREDERICO DA SILVEIRA, UFRB; LUCIANO DA SILVA SOUZA, UFRB; ÁUREO SILVA DE OLIVEIRA, UFRB; LAERCIO DUARTE SOUZA, CNPMF; FRANCISCO ADRIANO DE CARVALHO PEREIRA, UFRB; FAGNER TAIANO DOS SANTOS SILVA, UFRB. |
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Título: |
Redistribuição da água e capacidade de campo em latossolo amarelo distrocoeso, em Cruz das Almas, Bahia. |
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Ano de publicação: |
2011 |
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Fonte/Imprenta: |
In: CONGRESSO BRASILEIRO DE CIÊNCIA DO SOLO, 33., 2011, Uberlândia. Solos nos biomas brasileiros: sustentabilidade e mudanças climáticas: anais. Uberlândia: SBCS; UFU; ICIAG, 2011. 1 CD-ROM. |
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Idioma: |
Português |
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Conteúdo: |
A água é um dos principais componentes do sistema solo, sendo essencial para a vida vegetal e animal, ocupando, juntamente com o ar, todo o espaço poroso existente. Diante disso, o objetivo deste trabalho foi avaliar a redistribuição da água e a capacidade de campo in situ e em laboratório em diferentes horizontes de um Latossolo Amarelo Distrocoeso em Cruz das Almas, BA. No campo, medidas de potencial matricial foram feitas com tensiômetros de mercúrio em um experimento de perfil instantâneo. Os tensiômetros foram instalados nas profundidades de 0,285 m, 0,525 m, 0,810 m, 1,12 m, e 1,30 m. A capacidade de campo foi também determinada em laboratório, utilizando tubos de plástico preenchidos com solo peneirado. Amostras de solo foram coletadas no meio de cada horizonte, até a profundidade de 1,40 m, em duas repetições, com estrutura indeformada e deformadas, para as determinações físicas do solo. A redução do potencial matricial foi mais lenta nos horizontes coesos AB e BA, e estes não atingiram a capacidade de campo mesmo decorridos 50 dias de medição. Nos horizontes Bw1, Bw2 e Bw3 o potencial de -6kPa foi atingido, respectivamente, após 41, 10 e 1 dias. Foram encontrados potenciais matriciais variando entre -6 kPa e -36 kPa para os horizontes BA, Bw1, Bw2 e Bw3 para determinação da capacidade de campo em colunas de solo, e de -94 kPa e -69 kPa para os horizontes Ap e AB, respectivamente. |
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Palavras-Chave: |
Tabuleiro Costeiro. |
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Thesagro: |
Água; Latossolo Amarelo; Solo. |
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Categoria do assunto: |
X Pesquisa, Tecnologia e Engenharia |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/41423/1/1127-1.pdf
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Marc: |
LEADER 02239nam a2200217 a 4500
001 1898841
005 2011-10-19
008 2011 bl uuuu u00u1 u #d
100 1 $aSILVEIRA, F. G. F. da
245 $aRedistribuição da água e capacidade de campo em latossolo amarelo distrocoeso, em Cruz das Almas, Bahia.
260 $aIn: CONGRESSO BRASILEIRO DE CIÊNCIA DO SOLO, 33., 2011, Uberlândia. Solos nos biomas brasileiros: sustentabilidade e mudanças climáticas: anais. Uberlândia: SBCS; UFU; ICIAG, 2011. 1 CD-ROM.$c2011
520 $aA água é um dos principais componentes do sistema solo, sendo essencial para a vida vegetal e animal, ocupando, juntamente com o ar, todo o espaço poroso existente. Diante disso, o objetivo deste trabalho foi avaliar a redistribuição da água e a capacidade de campo in situ e em laboratório em diferentes horizontes de um Latossolo Amarelo Distrocoeso em Cruz das Almas, BA. No campo, medidas de potencial matricial foram feitas com tensiômetros de mercúrio em um experimento de perfil instantâneo. Os tensiômetros foram instalados nas profundidades de 0,285 m, 0,525 m, 0,810 m, 1,12 m, e 1,30 m. A capacidade de campo foi também determinada em laboratório, utilizando tubos de plástico preenchidos com solo peneirado. Amostras de solo foram coletadas no meio de cada horizonte, até a profundidade de 1,40 m, em duas repetições, com estrutura indeformada e deformadas, para as determinações físicas do solo. A redução do potencial matricial foi mais lenta nos horizontes coesos AB e BA, e estes não atingiram a capacidade de campo mesmo decorridos 50 dias de medição. Nos horizontes Bw1, Bw2 e Bw3 o potencial de -6kPa foi atingido, respectivamente, após 41, 10 e 1 dias. Foram encontrados potenciais matriciais variando entre -6 kPa e -36 kPa para os horizontes BA, Bw1, Bw2 e Bw3 para determinação da capacidade de campo em colunas de solo, e de -94 kPa e -69 kPa para os horizontes Ap e AB, respectivamente.
650 $aÁgua
650 $aLatossolo Amarelo
650 $aSolo
653 $aTabuleiro Costeiro
700 1 $aSOUZA, L. da S.
700 1 $aOLIVEIRA, A. S. de
700 1 $aSOUZA, L. D.
700 1 $aPEREIRA, F. A. de C.
700 1 $aSILVA, F. T. dos S.
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Embrapa Mandioca e Fruticultura (CNPMF) |
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| 1. |  | 1100067, CANADIAN JOURNAL OF AGRICULTURAL ECONOMICS, Canadian Agricultural Economics Society and Farm Management Society, Ottawa-Canada
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