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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: |
30/11/2023 |
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Autoria: |
SCHWARZ, T.; WIERZCHOS, E. |
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Título: |
Relationship between FSH and ovarian follicular dynamics in goats during the estrous cycle. |
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Ano de publicação: |
2000 |
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Fonte/Imprenta: |
Theriogenology, v. 53, n. 1, p. 381, 2000. |
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Idioma: |
Inglês |
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Notas: |
Edição de proceedings Annual Conference of the International Embryo Transfer Society, Maastricht, The Netherlands, jan. 2000. |
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Conteúdo: |
Ovarian ultrasonography examinations have shown that follicular development occurs in a wave-like pattern in cattle and that the waves are strongly correlated with serum FSH concentrations (Adams et aL, J Reprod Fertil l992;94:l77-188). In goats, there are a few reports of ovarian follicular dynamics assessed by ultrasonography; however, there is no research on corresponding FSH concentrations. The present study was conducted on three Polish white goats. Daily examinations were made on four natural estrous cycles in each goat during the breeding season using an ultrasound scanner equipped with a 7.5 MHz linear array probe. In a total of 12 cycles, alI follicles =3 mm in diameter were measured. photographs of ovaries were also taken, and sketches of ovarian activity were recorded each dar. A follicular wave was defined as a group of follicles which grew at the sanx: tilre and ftom which gave rise ore or more follicles >5 mm in diaIneter. Estrus behavior was checked twice per day with a vasectomized buck. In each goat, blood samples were collected daily for two cycles, Iand the concentrations of FSH were determined by RIA The data were analyzed by ANOVA, and the Student's t-test. The mean inter-ovulatory interval was 20.4 days (+1.1). Our results strongly support an earlier proposed hypothesis of a wave pattern of folliculogenesis (Ginther and Kot, Theriogenology 1994;42:987-1001). Cycles that were observed and monitored had different numbers of follicular waves. In 12 cycles observed there were 4 cycles with 4 waves, 5 cycles with 5 waves, 2 cycles with 6 waves and 1 cycle with 7 waves (this latter estrous cycle was 28 days long which is not typical so was oot considered in the final analysis). The mean nunber of waves per cycle was 4.8. The mean nunber of days for the emergence of waves was -1, 4, 7,11, and 15 days. The mean inter-wave interval (the time between the emergence of the previous wave and the emergence of the nextwave) was 4 days (+ 1.4), and the mean time from wave emergence to the day of the maximum diameter attained by the largest follicle was 4.1 days (+ 0.65): The mean nunber of follicles that reached >4 mm diameter was 5.8 (+ 1) follicles per wave, and 29.8 (+ 4.9) follicles per cycle. The analysis of daily serum FSH concentrations during six estrous cycles showed basallevels (0.1 ng/mL) with only one peak (0.6 ng/mL) around the time of estrus. There were no fluctuations in serum FSH concentrations during the estrous cycles. The mean rate of growth of the largest follicle in a wave was 0.8 mm diameter per day. The largest follicles of anovulatory waves were not different in size (6.2 mm) between waves and retween goats. However, the mean ovulatory follicle was significantly larger (7 mm; P< 0.05) than the mean largest follicle from anovulatory waves. There was highly significant difference between sizes of the largest and the second largest follicles in a wave. Analysis of the growth profiles of two of the largest follicles from each wave showed a typical pattern of domination with divergence in 32 in a total of 60 waves (53%). Divergence means that the second largest follicle stops growing earlier than the largest follicle, which is typical for the dominant follicle phenomenon in cattle (Bodensteiner et al., Theriogenology 1996;45:1115-1128). When a third follicle was included (if two large follicles were similar in diameter and it was possible that both were dominant), the divergence was seen in 42 waves (700/0). In this study it was observed that during the breeding season in goats, ovarian follicular developrnent has a wave-like pattem. The results do not support a relationship between FSH serum concentration and the emergence of follicular waves. This study did not give an answer to a question of the nature of the dominant follicle phenomenon in goats. MenosOvarian ultrasonography examinations have shown that follicular development occurs in a wave-like pattern in cattle and that the waves are strongly correlated with serum FSH concentrations (Adams et aL, J Reprod Fertil l992;94:l77-188). In goats, there are a few reports of ovarian follicular dynamics assessed by ultrasonography; however, there is no research on corresponding FSH concentrations. The present study was conducted on three Polish white goats. Daily examinations were made on four natural estrous cycles in each goat during the breeding season using an ultrasound scanner equipped with a 7.5 MHz linear array probe. In a total of 12 cycles, alI follicles =3 mm in diameter were measured. photographs of ovaries were also taken, and sketches of ovarian activity were recorded each dar. A follicular wave was defined as a group of follicles which grew at the sanx: tilre and ftom which gave rise ore or more follicles >5 mm in diaIneter. Estrus behavior was checked twice per day with a vasectomized buck. In each goat, blood samples were collected daily for two cycles, Iand the concentrations of FSH were determined by RIA The data were analyzed by ANOVA, and the Student's t-test. The mean inter-ovulatory interval was 20.4 days (+1.1). Our results strongly support an earlier proposed hypothesis of a wave pattern of folliculogenesis (Ginther and Kot, Theriogenology 1994;42:987-1001). Cycles that were observed and monitored had different numbers of follicular waves. In 12 cycles ... Mostrar Tudo |
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Palavras-Chave: |
Dinâmica folicular; Estro; Folículo; FSH. |
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Thesagro: |
Caprino; Ciclo Estral; Endocrinologia; Hormônio; Ovário; Reprodução Animal. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 04632nam a2200253 a 4500
001 1531037
005 2023-11-30
008 2000 bl uuuu u00u1 u #d
100 1 $aSCHWARZ, T.
245 $aRelationship between FSH and ovarian follicular dynamics in goats during the estrous cycle.
260 $aTheriogenology, v. 53, n. 1, p. 381$c2000
500 $aEdição de proceedings Annual Conference of the International Embryo Transfer Society, Maastricht, The Netherlands, jan. 2000.
520 $aOvarian ultrasonography examinations have shown that follicular development occurs in a wave-like pattern in cattle and that the waves are strongly correlated with serum FSH concentrations (Adams et aL, J Reprod Fertil l992;94:l77-188). In goats, there are a few reports of ovarian follicular dynamics assessed by ultrasonography; however, there is no research on corresponding FSH concentrations. The present study was conducted on three Polish white goats. Daily examinations were made on four natural estrous cycles in each goat during the breeding season using an ultrasound scanner equipped with a 7.5 MHz linear array probe. In a total of 12 cycles, alI follicles =3 mm in diameter were measured. photographs of ovaries were also taken, and sketches of ovarian activity were recorded each dar. A follicular wave was defined as a group of follicles which grew at the sanx: tilre and ftom which gave rise ore or more follicles >5 mm in diaIneter. Estrus behavior was checked twice per day with a vasectomized buck. In each goat, blood samples were collected daily for two cycles, Iand the concentrations of FSH were determined by RIA The data were analyzed by ANOVA, and the Student's t-test. The mean inter-ovulatory interval was 20.4 days (+1.1). Our results strongly support an earlier proposed hypothesis of a wave pattern of folliculogenesis (Ginther and Kot, Theriogenology 1994;42:987-1001). Cycles that were observed and monitored had different numbers of follicular waves. In 12 cycles observed there were 4 cycles with 4 waves, 5 cycles with 5 waves, 2 cycles with 6 waves and 1 cycle with 7 waves (this latter estrous cycle was 28 days long which is not typical so was oot considered in the final analysis). The mean nunber of waves per cycle was 4.8. The mean nunber of days for the emergence of waves was -1, 4, 7,11, and 15 days. The mean inter-wave interval (the time between the emergence of the previous wave and the emergence of the nextwave) was 4 days (+ 1.4), and the mean time from wave emergence to the day of the maximum diameter attained by the largest follicle was 4.1 days (+ 0.65): The mean nunber of follicles that reached >4 mm diameter was 5.8 (+ 1) follicles per wave, and 29.8 (+ 4.9) follicles per cycle. The analysis of daily serum FSH concentrations during six estrous cycles showed basallevels (0.1 ng/mL) with only one peak (0.6 ng/mL) around the time of estrus. There were no fluctuations in serum FSH concentrations during the estrous cycles. The mean rate of growth of the largest follicle in a wave was 0.8 mm diameter per day. The largest follicles of anovulatory waves were not different in size (6.2 mm) between waves and retween goats. However, the mean ovulatory follicle was significantly larger (7 mm; P< 0.05) than the mean largest follicle from anovulatory waves. There was highly significant difference between sizes of the largest and the second largest follicles in a wave. Analysis of the growth profiles of two of the largest follicles from each wave showed a typical pattern of domination with divergence in 32 in a total of 60 waves (53%). Divergence means that the second largest follicle stops growing earlier than the largest follicle, which is typical for the dominant follicle phenomenon in cattle (Bodensteiner et al., Theriogenology 1996;45:1115-1128). When a third follicle was included (if two large follicles were similar in diameter and it was possible that both were dominant), the divergence was seen in 42 waves (700/0). In this study it was observed that during the breeding season in goats, ovarian follicular developrnent has a wave-like pattem. The results do not support a relationship between FSH serum concentration and the emergence of follicular waves. This study did not give an answer to a question of the nature of the dominant follicle phenomenon in goats.
650 $aCaprino
650 $aCiclo Estral
650 $aEndocrinologia
650 $aHormônio
650 $aOvário
650 $aReprodução Animal
653 $aDinâmica folicular
653 $aEstro
653 $aFolículo
653 $aFSH
700 1 $aWIERZCHOS, E.
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| Registros recuperados : 6 | |
| 2. |  | DÜNISCH, O.; BAUCH, J.; SCHWARZ, T.; GASPAROTTO, L.; NEVES, E. Mineral element supply of plantation grown tropical trees species in Central Amazonia. In: SYMPOSIUM TROPISCHE NUTZPFLANZEN: BIOLOGIE, OKOLOGIE, OKONOMIE, 2., 1997, Hamburg. Abstracts der Vortrage und Poster... Hamburg: University, 1997. p. 22.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Amazônia Ocidental. |
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| 5. | | DUNISCH, O.; BAUCH, J.; MULLER, M.; SCHWARZ, T.; POLACZCK, S.; GASPAROTTO, L.; NEVES, E.; AZEVEDO, C. de; LIMA, R. de; MORAIS, R. de. Investigations on tree species suitable for the recultivation of degraded land areas in Central Amazonia. In: SHIFT-WORKSHOP, 3., 1998, Manaus. Program, abstracts of presentations and posters... Hamburg: GKSS, 1998. p. C22.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Amazônia Ocidental. |
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| 6. | | DÜNISCH, O.; BAUCH, J.; MÜLLER, M.; SCHWARZ, T.; POLACZEK, S.; GASPAROTTO, L.; NEVES, E.; AZEVEDO, C. de; LIMA, R. de; MORAIS, R. de. Investigations on tree species suitable for the recultivation of degraded land areas in Central Amazonia. In: SYMPOSIUM TROPISCHE NUTZPFLANZEN: BIOLOGIE, OKOLOGIE, OKONOMIE, 2., 1997, Hamburg. Abstracts der Vortrage und Poster... Hamburg: University, 1997. p. 52.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Amazônia Ocidental. |
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| Registros recuperados : 6 | |
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