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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
01/04/2005 |
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Data da última atualização: |
01/04/2005 |
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Autoria: |
VIÑOLES, C.; FORSBERG, M.; BANCHERO, G.; RUBIANES, E. |
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Título: |
Ovarian follicular dynamics and endocrine profiles in Polwarth ewes with high and low body condition. |
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Ano de publicação: |
2002 |
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Fonte/Imprenta: |
Animal Science, v. 74, pt 3, p. 539-545, 2002. |
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Idioma: |
Inglês |
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Conteúdo: |
In this investigation we tested the hypothesis that static body condition (BC) of the ewe affects oestradiol and FSH with implications for subsequent follicular growth and turn-over. Sixteen Polwarth ewes were selected from a flock according to their BC score (scale: 1 emaciated; 5 obese). High BC (HBC) ewes (no. = 8) had a BC score of 4.1 (s.e. 0.1) and low BC (LBC) ewes (no. = 8) had a BC score of 1.9 (s.e.O.1). Daily ultrasound examinations were performed and blood samples for progesterone, oestradiol and follicle-stimulating hormone (FSH) determination were collected. All HBC ewes (8/8) exhibited three waves of follicular development, while four LBC ewes (4/8) had two waves and the other four (4/8) had three waves of follicular development (P £0.05) during the interovulatory período Overall, the emergences of 33 out of 44 follicular waves were preceded by significant increases in FSH concentrations. Maximum FSH concentrations were detected 0.9+0.2 days before wave emergence. Oestradiol concentrations increased significantly during the growing phase in 38 out of 44 large follicles. A negative correlation between oestradiol and FSH was observed in HBC ewes. A similar inhibitory e.ffect of oestradiol on FSH was observed in LBC ewes, irrespective of whether they developed two or three follicular waves. However, a longer period with high FSH was needed to promote the emergence of the second follicular wave in two-wave LBC ewes. Four HBC ewes had twin ovulations but no LBC ewes did (P £0.05). In HBC ewes, the follicular phase was characterized by lower oestradiol (6.5 (s.e.l.0) pmol/l) but higher mean FSH concentrations (2-4 (s.e.O-4) ,mg/l) than in LBC ewes (8.9 (s.e.l.2) pmol/l and 2.0 (s.e. 0.3) , mg/l, respectively; P £0.05). The present results suggest that BC influences the pattern of follicular dynamics through changes in the endocrine milieu. Higher FSH concentrations during the follicular phase in HBC ewes, which allowed an extended period of follicular recruitment from a significantly larger pool of small antral follicles could explain the higher ovulation rate observed in this group. MenosIn this investigation we tested the hypothesis that static body condition (BC) of the ewe affects oestradiol and FSH with implications for subsequent follicular growth and turn-over. Sixteen Polwarth ewes were selected from a flock according to their BC score (scale: 1 emaciated; 5 obese). High BC (HBC) ewes (no. = 8) had a BC score of 4.1 (s.e. 0.1) and low BC (LBC) ewes (no. = 8) had a BC score of 1.9 (s.e.O.1). Daily ultrasound examinations were performed and blood samples for progesterone, oestradiol and follicle-stimulating hormone (FSH) determination were collected. All HBC ewes (8/8) exhibited three waves of follicular development, while four LBC ewes (4/8) had two waves and the other four (4/8) had three waves of follicular development (P £0.05) during the interovulatory período Overall, the emergences of 33 out of 44 follicular waves were preceded by significant increases in FSH concentrations. Maximum FSH concentrations were detected 0.9+0.2 days before wave emergence. Oestradiol concentrations increased significantly during the growing phase in 38 out of 44 large follicles. A negative correlation between oestradiol and FSH was observed in HBC ewes. A similar inhibitory e.ffect of oestradiol on FSH was observed in LBC ewes, irrespective of whether they developed two or three follicular waves. However, a longer period with high FSH was needed to promote the emergence of the second follicular wave in two-wave LBC ewes. Four HBC ewes had twin ovulations but no LBC ewe... Mostrar Tudo |
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Palavras-Chave: |
Conformação corporal; Dinâmica folicular; Folículo. |
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Thesagro: |
Ciclo Estral; Condição Corporal; Cordeiro; Endocrinologia; Estradiol; Ovino; Reprodução Animal. |
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Categoria do assunto: |
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Marc: |
LEADER 02896naa a2200277 a 4500
001 1531053
005 2005-04-01
008 2002 bl uuuu u00u1 u #d
100 1 $aVIÑOLES, C.
245 $aOvarian follicular dynamics and endocrine profiles in Polwarth ewes with high and low body condition.
260 $c2002
520 $aIn this investigation we tested the hypothesis that static body condition (BC) of the ewe affects oestradiol and FSH with implications for subsequent follicular growth and turn-over. Sixteen Polwarth ewes were selected from a flock according to their BC score (scale: 1 emaciated; 5 obese). High BC (HBC) ewes (no. = 8) had a BC score of 4.1 (s.e. 0.1) and low BC (LBC) ewes (no. = 8) had a BC score of 1.9 (s.e.O.1). Daily ultrasound examinations were performed and blood samples for progesterone, oestradiol and follicle-stimulating hormone (FSH) determination were collected. All HBC ewes (8/8) exhibited three waves of follicular development, while four LBC ewes (4/8) had two waves and the other four (4/8) had three waves of follicular development (P £0.05) during the interovulatory período Overall, the emergences of 33 out of 44 follicular waves were preceded by significant increases in FSH concentrations. Maximum FSH concentrations were detected 0.9+0.2 days before wave emergence. Oestradiol concentrations increased significantly during the growing phase in 38 out of 44 large follicles. A negative correlation between oestradiol and FSH was observed in HBC ewes. A similar inhibitory e.ffect of oestradiol on FSH was observed in LBC ewes, irrespective of whether they developed two or three follicular waves. However, a longer period with high FSH was needed to promote the emergence of the second follicular wave in two-wave LBC ewes. Four HBC ewes had twin ovulations but no LBC ewes did (P £0.05). In HBC ewes, the follicular phase was characterized by lower oestradiol (6.5 (s.e.l.0) pmol/l) but higher mean FSH concentrations (2-4 (s.e.O-4) ,mg/l) than in LBC ewes (8.9 (s.e.l.2) pmol/l and 2.0 (s.e. 0.3) , mg/l, respectively; P £0.05). The present results suggest that BC influences the pattern of follicular dynamics through changes in the endocrine milieu. Higher FSH concentrations during the follicular phase in HBC ewes, which allowed an extended period of follicular recruitment from a significantly larger pool of small antral follicles could explain the higher ovulation rate observed in this group.
650 $aCiclo Estral
650 $aCondição Corporal
650 $aCordeiro
650 $aEndocrinologia
650 $aEstradiol
650 $aOvino
650 $aReprodução Animal
653 $aConformação corporal
653 $aDinâmica folicular
653 $aFolículo
700 1 $aFORSBERG, M.
700 1 $aBANCHERO, G.
700 1 $aRUBIANES, E.
773 $tAnimal Science$gv. 74, pt 3, p. 539-545, 2002.
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Embrapa Caprinos e Ovinos (CNPC) |
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