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 | Acesso ao texto completo restrito à biblioteca da Embrapa Caprinos e Ovinos. Para informações adicionais entre em contato com cnpc.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
01/08/1992 |
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Data da última atualização: |
11/05/2023 |
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Autoria: |
TASSELL, R.; CHAMLEY, W. A.; KENNEDY, J. P. |
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Título: |
Gonadotrophin levels and ovarian development in the neonatal ewe lamb. |
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Ano de publicação: |
1978 |
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Fonte/Imprenta: |
Australian Journal of Biology Science, v. 31, n. 3, p. 267-273, Jun. 1978. |
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DOI: |
10.1071/bi9780267 |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: Ovarian weight has been shown to increase markedly in the newborn ewe lamb, and factors which might contribute to this growth were examined. Follicle development was studied in the ovaries of 28 lambs aged 0, 2, 4, 6, 8 and 10 weeks. Plasma samples, pituitaries and one ovary were assayed for gonadotrophin or steroid hormone content. No significant differences between age groups were found in pituitary LH concentration or mean plasma LH. Pituitary FSH concentration increased with age, except for a small decrease at 8 weeks, but no significant changes were seen in plasma FSH. Ovarian progesterone and oestradiol concentrations did not appear to be associated with follicular development. Growing follicles were most numerous at 2 weeks whilst total vesicular follicles reached a peak at 4 weeks. Most vesicular follicles were less than 1.4 mm in diameter. Advanced atresia in vesicular follicles became apparent by 4 weeks although early signs were present in younger lambs. Fluctuations in gonadotrophin levels do not appear to be responsible for variations in number and size of vesicular and growing follicles in the lamb ovary. Other possible explanations are discussed. |
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Palavras-Chave: |
Analysis progesterone; Fisiiologia; Folículos ovarianos; Glândula pituitária; Growth; Newborn animals; Ovary; Ovary culture (animals); Ovino Reproducao. |
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Thesagro: |
Crescimento; Endocrinologia; Estradiol; Gonadotrofina; Ovelha; Ovino; Progesterona; Reprodução. |
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Thesaurus Nal: |
Endocrinology; Ewes; Gonadotropins; Ovarian follicles; Pituitary gland; Pituitary gonadotropins; Progesterone; Reproduction; Sheep. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02432naa a2200469 a 4500
001 1520132
005 2023-05-11
008 1978 bl uuuu u00u1 u #d
024 7 $a10.1071/bi9780267$2DOI
100 1 $aTASSELL, R.
245 $aGonadotrophin levels and ovarian development in the neonatal ewe lamb.
260 $c1978
520 $aAbstract: Ovarian weight has been shown to increase markedly in the newborn ewe lamb, and factors which might contribute to this growth were examined. Follicle development was studied in the ovaries of 28 lambs aged 0, 2, 4, 6, 8 and 10 weeks. Plasma samples, pituitaries and one ovary were assayed for gonadotrophin or steroid hormone content. No significant differences between age groups were found in pituitary LH concentration or mean plasma LH. Pituitary FSH concentration increased with age, except for a small decrease at 8 weeks, but no significant changes were seen in plasma FSH. Ovarian progesterone and oestradiol concentrations did not appear to be associated with follicular development. Growing follicles were most numerous at 2 weeks whilst total vesicular follicles reached a peak at 4 weeks. Most vesicular follicles were less than 1.4 mm in diameter. Advanced atresia in vesicular follicles became apparent by 4 weeks although early signs were present in younger lambs. Fluctuations in gonadotrophin levels do not appear to be responsible for variations in number and size of vesicular and growing follicles in the lamb ovary. Other possible explanations are discussed.
650 $aEndocrinology
650 $aEwes
650 $aGonadotropins
650 $aOvarian follicles
650 $aPituitary gland
650 $aPituitary gonadotropins
650 $aProgesterone
650 $aReproduction
650 $aSheep
650 $aCrescimento
650 $aEndocrinologia
650 $aEstradiol
650 $aGonadotrofina
650 $aOvelha
650 $aOvino
650 $aProgesterona
650 $aReprodução
653 $aAnalysis progesterone
653 $aFisiiologia
653 $aFolículos ovarianos
653 $aGlândula pituitária
653 $aGrowth
653 $aNewborn animals
653 $aOvary
653 $aOvary culture (animals)
653 $aOvino Reproducao
700 1 $aCHAMLEY, W. A.
700 1 $aKENNEDY, J. P.
773 $tAustralian Journal of Biology Science$gv. 31, n. 3, p. 267-273, Jun. 1978.
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