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      Avaliação dos níveis séricos de triiodotironina (T3) e tiroxina (T4) durante o ciclo estral em marrãs (Sus scrofa domestica - Linnaeus, 1758) Translated title: Triiodothyronine (T3) and thyronine (T4) serum level evaluation during the oestrus cycle in guilts (Sus scrofa domestica - Linnaeus, 1758)

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          Abstract

          No presente trabalho, foram utilizadas 21 fêmeas suínas, virgens, sexualmente aptas, criadas e mantidas sob condições industriais, para observação dos perfis hormonais séricos de triiodotironina e tiroxina, durante o ciclo estral. As colheitas de sangue foram efetuadas sempre no mesmo intervalo, entre 8 e 10 horas. Cada animal foi submetido a 14 punções venosas, distribuídas nos dias zero, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 21, 22 e 23 do ciclo estral. Consideramos o dia zero como o primeiro dia da fase estral, e o 23º dia como o primeiro do estro subseqüente. Os ensaios para dosagens hormonais foram executados utilizando-se a técnica de radioimunoensaio (RIE) em fase sólida e para isso foi empregado conjunto de reagentes comerciais (Coat-A-Count®). Para o hormônio triiodotironina foram observados valores altos no 1º e 23º dia e valor mínimo no 12º dia do ciclo estral. O hormônio tiroxina apresentou valores que oscilaram entre 2,42 e 3,74 mig/dl.

          Translated abstract

          In the present study 21 young female swines, sexually mature, reared and kept under a industrial management system were assessed for its progesterone serum profiles during the oestrus cycle. Blood sampling was performed always at the same interval, from 8:00 to 10:00 AM. Each animal was submitted to 14 venal punctions at days 0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 21, 22 and 23 of the oestrous cycle. the first day of the oestrous phase was assumed to be Day 0 and the 23rd as the first of the next cycle. Hormone determinations were performed employing a solid phase radioimmunoassay (RIA). Highest T3 concentrations were observed at the 1st and 23rd days and minimul values for the 12hd of the oestrus cycle. Regarding T4, the concentration values ranged from 2.42 and 3.74 mug/dl.

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          Pharmacological interference with in vitro tests of thyroid function.

          K Wenzel (1981)
          Numerous drugs may cause changes in the serum concentrations of T4 and of T3. If such alterations are not recognized an incorrect diagnosis may result. In moderate degrees of hypo- and hyperthyroidism thyroid hormone levels may be spuriously normal, or the influence of pharmacological substances may lead to false diagnosis of thyroid disease in euthyroid patients. Since prediction of such alterations remains uncertain, it may be necessary to perform additional investigations when a potential artefact is recognized. On the other hand many pharmacological agents, especially those which interact with neurotransmitters, may influence TSH secretion, too. The TRH-test may show an increase or decreased TSH response, although complete suppression is only rarely seen during high-dose glucocorticoid treatment when low TRH doses are applied. Because of TRH-test gives such wide separation between different clinical states false interpretations are generally less likely than with drug-induced changes in T4 and T3 values.
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            Hypothyroidism in ruminants with special reference to foetal goitre

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              The influence of growth hormone injections on the endocrine and metabolic status of gilts

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                Author and article information

                Journal
                bjvras
                Brazilian Journal of Veterinary Research and Animal Science
                Braz. J. Vet. Res. Anim. Sci.
                Faculdade de Medicina Veterinária e Zootecnia / Universidade de São Paulo (São Paulo, SP, Brazil )
                1413-9596
                1678-4456
                1998
                : 35
                : 5
                Affiliations
                [03] Jaboticabal SP orgnameUniversidade Estadual de São Paulo orgdiv1Faculdade de Ciências Agrárias e Veterinárias orgdiv2Departamento de Ciências Exatas
                [02] SP orgnameUniversidade de São Paulo orgdiv1Faculdade de Medicina Veterinária e Zootecnia orgdiv2Departamento de Reprodução Animal
                [04] Jaboticabal SP orgnameUniversidade Estadual de São Paulo orgdiv1Faculdade de Ciências Agrárias e Veterinárias orgdiv2Departamento de Clínica e Cirurgia Veterinária
                [01] Jaboticabal SP orgnameUniversidade Estadual de São Paulo orgdiv1Faculdade de Ciências Agrárias e Veterinárias orgdiv2Departamento de Reprodução Animal
                Article
                S1413-95961998000500003 S1413-9596(98)03500503
                38bf4d58-6f9d-4e1b-a6e1-0d90972ca8a3

                This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

                History
                : 30 March 1998
                : 23 May 1996
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 19, Pages: 0
                Product

                SciELO Brazil

                Self URI: Texto completo somente em PDF (PT)
                Categories
                Medicina Veterinária

                Thyroxine,Triiodotironina,Tiroxina,Suínos,Triiodothyronine,Swine

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