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dc.contributor.authorMalheiros, R. D.
dc.contributor.authorMoraes, V. M. B.
dc.contributor.authorFurlan, R. L.
dc.contributor.authorBruggeman, V.
dc.contributor.authorBuyse, J.
dc.contributor.authorDecuypere, E.
dc.contributor.authorMacari, Marcos [UNESP]
dc.identifier.citationActa Veterinaria Hungarica. Budapest: Akademiai Kiado, v. 50, n. 4, p. 425-434, 2002.
dc.description.abstractSomatotrophic and thyroid hormones were determined around the onset of reproduction in broiler breeders reared in two different housing systems [dark, close-sided house (CH) and conventional, open-sided house (OH)]. In both groups age-related changes were obvious for thyroxine (T-4), growth hormone (GH) and insulin-like growth factor (IGF-1); levels of T-4 decreased, especially between 24 and 28 weeks in both groups; concomitantly GH sharply increased over the same period. A transient peak in triiodothyronine (T-3) occurred between 25 and 27 weeks. The effect of housing was only present after the onset of lay. Between weeks 27-28 and the end of the period studied, the CH group showed higher levels of GH and T-3 but lower T-4 levels as compared to the OH group. A significant increase in GH after onset of lay, without any significant rise in T-3 or in IGF-I, could point to a relative insensitivity to high plasma GH levels. Changes at GH receptor level, together with an increased pituitary GH secretion and/or decreased GH turnover may be expected. This may indicate that hypothalamo-pituitary changes at the onset of lay not only imply changes of gonadotrophic cell function, but also other hormonal axes. The relatively decrease in T-4 without changes in T-3, may point to a decrease in the activity of the thyrotropic axis.en
dc.publisherAkademiai Kiado
dc.relation.ispartofActa Veterinaria Hungarica
dc.sourceWeb of Science
dc.subjectbroiler breederspt
dc.subjectGrowth hormonept
dc.subjectthyroid hormonespt
dc.titleSomatotrophic and thyroid hormones around the onset of lay in broiler breeders under different conditionsen
dcterms.rightsHolderAkademiai Kiado
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionCatholic Univ Louvain
dc.description.affiliationUniv Estadual Paulista, UNESP, Dept Morfol & Fisiol Anim, BR-14870000 Jaboticabal, SP, Brazil
dc.description.affiliationUniv Estadual Paulista, UNESP, Dept Zootecn, BR-14870000 Jaboticabal, SP, Brazil
dc.description.affiliationCatholic Univ Louvain, Dept Anim Prod, Lab Physiol & Immunol Domest ANim, B-3001 Heverlee, Belgium
dc.description.affiliationUnespUniv Estadual Paulista, UNESP, Dept Morfol & Fisiol Anim, BR-14870000 Jaboticabal, SP, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, UNESP, Dept Zootecn, BR-14870000 Jaboticabal, SP, Brazil
dc.rights.accessRightsAcesso restrito
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Ciências Agrárias e Veterinárias, Jaboticabalpt
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