Puberty and growth rate in thoroughbred fillies

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dc.contributor.authorNogueira, G. P.
dc.contributor.authorBarnabe, R. C.
dc.contributor.authorVerreschi, ITN
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade Federal de São Paulo (UNIFESP)
dc.date.accessioned2014-05-20T15:22:10Z
dc.date.available2014-05-20T15:22:10Z
dc.date.issued1997-09-01
dc.description.abstractWe measured progesterone and estradiol levels from birth to the beginning of adult life in 10 Thoroughbred fillies from the Equilia Stud Farm in Avare SP, Brasil. The animals were measured and weighed monthly for the determination of body development and of a possible correlation between the rate of weight and height gain and the onset of detectable sex hormone levels. Jugular blood was collected twice a week and stored at -20 degrees C until assay of progesterone by a solid phase RIA with a sensitivity of 0.32 nmol/L and of estradiol by liquid phase RIA adapted to low levels (3.67 pmol/L). The fillies were born with high serum levels of both hormones,which fell to undetectable levels by the first week of life. A variation in growth rate was observed, with the highest levels occuring from birth to the 3rd month of life, followed by a reduction until 15 mo of life, when fast growth was resumed. The monthly weight gain was 1.5% when the fillies reached puberty and 5.4% during the next month, (P<0.05, Friedman test). During this second period of accelerated growth after the beginning of progesterone production at detectable levels (above 0.318 nmol/L), the parameters of skeletal growth did not differ (P>0.05). The month of onset of puberty was the month of lowest weight gain in the life of the fillies, and it coincided with the highest insolation period. In conclusion, horses, like all other developed vertebrates, have a double pattern of development, with the acceleration observed at puberty depending on sex steroids, which in turn coincides with the highest insolation period. Gonadal activity characterized by serum progesterone levels was low from birth to the onset of puberty. After puberty the progesterone cycles were similar to those of adult animals with a mature hypothalamic-gonadal axis. (C) 1997 by Elsevier B.V.en
dc.description.affiliationUNIV SAO PAULO,FMVZ,ANIM REPROD DEPT,BR-05340000 SAO PAULO,BRAZIL
dc.description.affiliationUNIFESP,EPM,DIV ENDOCRINE,BR-04034970 SAO PAULO,BRAZIL
dc.format.extent581-588
dc.identifierhttp://dx.doi.org/10.1016/S0093-691X(97)00275-6
dc.identifier.citationTheriogenology. New York: Elsevier B.V., v. 48, n. 4, p. 581-588, 1997.
dc.identifier.doi10.1016/S0093-691X(97)00275-6
dc.identifier.issn0093-691X
dc.identifier.urihttp://hdl.handle.net/11449/33212
dc.identifier.wosWOS:A1997XU04200008
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofTheriogenology
dc.relation.ispartofjcr2.136
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectpubertypt
dc.subjectgrowthpt
dc.subjecthorsespt
dc.subjectsex hormonespt
dc.titlePuberty and growth rate in thoroughbred filliesen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.

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