Effect of severe energy restriction and refeeding on thyroid hormones in bulls.

J. Janan, P. Rudas, T. Bartha, S. Bozó, G. Gábor

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Fifty-three Holstein-Friesian breeding bulls (944.99 +/- 14.59 kg) were fasted for 4 weeks. The influence of feeding on thyroid hormones was studied by comparing a starting point with a 4-week fasting period and a refeeding period. Blood samples were taken via a jugular vein catheter at 8:00 a.m. one day before, then once every week during, and two times after the fasting period. Plasma thyroxine (T4) and triiodothyronine (T3) levels were determined by direct radioimmuno-assay. The concentration of T4 and T3 decreased during fasting. The concentration of T3 increased after refeeding, but that of T4 did not. These data suggest that fasting is associated with a decrease in the peripheral conversion of T4 to T3 and, consequently, less T4 is converted into T3.

Original languageEnglish
Pages (from-to)173-177
Number of pages5
JournalActa Veterinaria Hungarica
Volume43
Issue number1
Publication statusPublished - 1995

Fingerprint

refeeding
triiodothyronine
thyroid hormones
Thyroid Hormones
L-thyroxine
Fasting
bulls
fasting
energy
Jugular Veins
Triiodothyronine
Thyroxine
Breeding
Catheters
jugular vein
thyroxine
catheters
Holstein
blood
breeding

ASJC Scopus subject areas

  • veterinary(all)

Cite this

Effect of severe energy restriction and refeeding on thyroid hormones in bulls. / Janan, J.; Rudas, P.; Bartha, T.; Bozó, S.; Gábor, G.

In: Acta Veterinaria Hungarica, Vol. 43, No. 1, 1995, p. 173-177.

Research output: Contribution to journalArticle

@article{0b47549b5c264a4296f9814ad512c418,
title = "Effect of severe energy restriction and refeeding on thyroid hormones in bulls.",
abstract = "Fifty-three Holstein-Friesian breeding bulls (944.99 +/- 14.59 kg) were fasted for 4 weeks. The influence of feeding on thyroid hormones was studied by comparing a starting point with a 4-week fasting period and a refeeding period. Blood samples were taken via a jugular vein catheter at 8:00 a.m. one day before, then once every week during, and two times after the fasting period. Plasma thyroxine (T4) and triiodothyronine (T3) levels were determined by direct radioimmuno-assay. The concentration of T4 and T3 decreased during fasting. The concentration of T3 increased after refeeding, but that of T4 did not. These data suggest that fasting is associated with a decrease in the peripheral conversion of T4 to T3 and, consequently, less T4 is converted into T3.",
author = "J. Janan and P. Rudas and T. Bartha and S. Boz{\'o} and G. G{\'a}bor",
year = "1995",
language = "English",
volume = "43",
pages = "173--177",
journal = "Acta Veterinaria Hungarica",
issn = "0236-6290",
publisher = "Akademiai Kiado",
number = "1",

}

TY - JOUR

T1 - Effect of severe energy restriction and refeeding on thyroid hormones in bulls.

AU - Janan, J.

AU - Rudas, P.

AU - Bartha, T.

AU - Bozó, S.

AU - Gábor, G.

PY - 1995

Y1 - 1995

N2 - Fifty-three Holstein-Friesian breeding bulls (944.99 +/- 14.59 kg) were fasted for 4 weeks. The influence of feeding on thyroid hormones was studied by comparing a starting point with a 4-week fasting period and a refeeding period. Blood samples were taken via a jugular vein catheter at 8:00 a.m. one day before, then once every week during, and two times after the fasting period. Plasma thyroxine (T4) and triiodothyronine (T3) levels were determined by direct radioimmuno-assay. The concentration of T4 and T3 decreased during fasting. The concentration of T3 increased after refeeding, but that of T4 did not. These data suggest that fasting is associated with a decrease in the peripheral conversion of T4 to T3 and, consequently, less T4 is converted into T3.

AB - Fifty-three Holstein-Friesian breeding bulls (944.99 +/- 14.59 kg) were fasted for 4 weeks. The influence of feeding on thyroid hormones was studied by comparing a starting point with a 4-week fasting period and a refeeding period. Blood samples were taken via a jugular vein catheter at 8:00 a.m. one day before, then once every week during, and two times after the fasting period. Plasma thyroxine (T4) and triiodothyronine (T3) levels were determined by direct radioimmuno-assay. The concentration of T4 and T3 decreased during fasting. The concentration of T3 increased after refeeding, but that of T4 did not. These data suggest that fasting is associated with a decrease in the peripheral conversion of T4 to T3 and, consequently, less T4 is converted into T3.

UR - http://www.scopus.com/inward/record.url?scp=0029201332&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0029201332&partnerID=8YFLogxK

M3 - Article

C2 - 7625289

AN - SCOPUS:0029201332

VL - 43

SP - 173

EP - 177

JO - Acta Veterinaria Hungarica

JF - Acta Veterinaria Hungarica

SN - 0236-6290

IS - 1

ER -