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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
27/09/1996 |
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Data da última atualização: |
13/06/2023 |
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Autoria: |
LEYVA-OCARIZ, H.; MUNRO, C.; STABENFELDT, G. H. |
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Título: |
Serum LH, FSH, estradiol-17Beta and progesterone profiles of native and crosbred goats in a tropical semiarid zone of Venezuela during the estrous cycle. |
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Ano de publicação: |
1995 |
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Fonte/Imprenta: |
Animal Reproduction Science, v. 39, n. 1, p. 49-58, 1995. |
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DOI: |
https://doi.org/10.1016/0378-4320(95)01377-C |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: The patterns of serum luteinizing hormone (LH), follicle stimulating hormone (FSH), progesterone and estradiol-17β during the estrous cycle of six crossbred (Alpine × Nubian × Native) and six native goats showing a 21 day estrous cycle in a semiarid zone of Venezuela are presented. In the crossbred goats, FSH had two significant peaks on Days 19 and 0 (33 ± 8.6 ng ml−1 and 25 ± 6 ng ml−1, respectively); in contrast, native goats only had one significant peak on the day of estrus (22 ± 2 ng ml−1), with the increase beginning on Day 17. During the follicular phase of crossbred goats, estradiol-17β and LH increased to 28 ± 6 pg ml−1 and 23 ± 6.9 ng ml−1, respectively, on Day 0. Prior to Day 0, LH increased to 10.0 ± 4.9 ng ml−1 on Day 18, decreasing to 1.5 ng ml−1 on Day 19, while estradiol-17β was increasing. This relationship between estradiol-17β and LH was not found to exist in native does, which presented a LH peak on Day 0 (30 ± 8 ng ml−1 and 35 ± 10 ng ml−1 in first and second estrus, respectively). LH basal levels were notably higher in native does. The highest concentrations of progesterone (10 and 12 ng ml−1) were detected on Days 12 and 15 in crossbred and native females, respectively. In conclusion, the relationship between estradiol-17β and gonadotropins during the follicular phase in crossbred goats suggests negative and positive feedback effects on both LH and FSH. Serum concentrations of LH were higher in native than in crossbred goats, whereas concentrations of FSH were higher in crossbred does. Thus, genetic factors need to be taken into account when comparing blood levels of gonadotropins in goats raised in tropical semiarid zones. MenosAbstract: The patterns of serum luteinizing hormone (LH), follicle stimulating hormone (FSH), progesterone and estradiol-17β during the estrous cycle of six crossbred (Alpine × Nubian × Native) and six native goats showing a 21 day estrous cycle in a semiarid zone of Venezuela are presented. In the crossbred goats, FSH had two significant peaks on Days 19 and 0 (33 ± 8.6 ng ml−1 and 25 ± 6 ng ml−1, respectively); in contrast, native goats only had one significant peak on the day of estrus (22 ± 2 ng ml−1), with the increase beginning on Day 17. During the follicular phase of crossbred goats, estradiol-17β and LH increased to 28 ± 6 pg ml−1 and 23 ± 6.9 ng ml−1, respectively, on Day 0. Prior to Day 0, LH increased to 10.0 ± 4.9 ng ml−1 on Day 18, decreasing to 1.5 ng ml−1 on Day 19, while estradiol-17β was increasing. This relationship between estradiol-17β and LH was not found to exist in native does, which presented a LH peak on Day 0 (30 ± 8 ng ml−1 and 35 ± 10 ng ml−1 in first and second estrus, respectively). LH basal levels were notably higher in native does. The highest concentrations of progesterone (10 and 12 ng ml−1) were detected on Days 12 and 15 in crossbred and native females, respectively. In conclusion, the relationship between estradiol-17β and gonadotropins during the follicular phase in crossbred goats suggests negative and positive feedback effects on both LH and FSH. Seru... Mostrar Tudo |
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Palavras-Chave: |
Raça Mestiça. |
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Thesagro: |
Cabra; Caprino; Ciclo Estral; Estradiol; Gonadotrofina; Progesterona. |
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Thesaurus Nal: |
Crossbreds; Endocrinology; Estrous cycle; Follicle-stimulating hormone; Goats; Gonadotropins; Luteinizing hormone; Progesterone; Reproduction. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02836naa a2200349 a 4500
001 1523796
005 2023-06-13
008 1995 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1016/0378-4320(95)01377-C$2DOI
100 1 $aLEYVA-OCARIZ, H.
245 $aSerum LH, FSH, estradiol-17Beta and progesterone profiles of native and crosbred goats in a tropical semiarid zone of Venezuela during the estrous cycle.$h[electronic resource]
260 $c1995
520 $aAbstract: The patterns of serum luteinizing hormone (LH), follicle stimulating hormone (FSH), progesterone and estradiol-17β during the estrous cycle of six crossbred (Alpine × Nubian × Native) and six native goats showing a 21 day estrous cycle in a semiarid zone of Venezuela are presented. In the crossbred goats, FSH had two significant peaks on Days 19 and 0 (33 ± 8.6 ng ml−1 and 25 ± 6 ng ml−1, respectively); in contrast, native goats only had one significant peak on the day of estrus (22 ± 2 ng ml−1), with the increase beginning on Day 17. During the follicular phase of crossbred goats, estradiol-17β and LH increased to 28 ± 6 pg ml−1 and 23 ± 6.9 ng ml−1, respectively, on Day 0. Prior to Day 0, LH increased to 10.0 ± 4.9 ng ml−1 on Day 18, decreasing to 1.5 ng ml−1 on Day 19, while estradiol-17β was increasing. This relationship between estradiol-17β and LH was not found to exist in native does, which presented a LH peak on Day 0 (30 ± 8 ng ml−1 and 35 ± 10 ng ml−1 in first and second estrus, respectively). LH basal levels were notably higher in native does. The highest concentrations of progesterone (10 and 12 ng ml−1) were detected on Days 12 and 15 in crossbred and native females, respectively. In conclusion, the relationship between estradiol-17β and gonadotropins during the follicular phase in crossbred goats suggests negative and positive feedback effects on both LH and FSH. Serum concentrations of LH were higher in native than in crossbred goats, whereas concentrations of FSH were higher in crossbred does. Thus, genetic factors need to be taken into account when comparing blood levels of gonadotropins in goats raised in tropical semiarid zones.
650 $aCrossbreds
650 $aEndocrinology
650 $aEstrous cycle
650 $aFollicle-stimulating hormone
650 $aGoats
650 $aGonadotropins
650 $aLuteinizing hormone
650 $aProgesterone
650 $aReproduction
650 $aCabra
650 $aCaprino
650 $aCiclo Estral
650 $aEstradiol
650 $aGonadotrofina
650 $aProgesterona
653 $aRaça Mestiça
700 1 $aMUNRO, C.
700 1 $aSTABENFELDT, G. H.
773 $tAnimal Reproduction Science$gv. 39, n. 1, p. 49-58, 1995.
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Registro original: |
Embrapa Caprinos e Ovinos (CNPC) |
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