[Thyroid hormones in Old German Black Pied- and Holstein-Friesian suckling calves. Effects of parturition and postpartum adaptation].
The present trial deals with the effects of birth stress on the thyreoidea respectively on the thyroxine- and triiodthyronine-concentration as well as on their unbound fraction (FT4 and FT3) of suckler calves and the evolution of those parameters in the first three months of life. T4- and T3 concentrations in blood serum of calves were beyond maternal levels increasing significantly in the first 24 hours with strong individual specificity and reaching levels of adult animals at the end of the three-month-period. The different increasing rates of the four parameters show a stimulation of the thyreoideal activity and of the monodejodinase-system as well and they show also a greater decomposition rate of the binding proteins. An influence of the course of parturition on the T3 level p.n. and the T4/T3 ratio in the first 24 hours could be disclosed. The hormone concentrations p.n. showed correlations to the pH and pCO2 of the neonatal calves. For T4 and T3 a strong influence of maternal levels on the hormone levels of the calves p.n. could be ascertained. Effects of breed, surrounding temperatures and type of husbandry on the investigated parameters could be established.
Grünberg
W
W
Institut für Tierzucht und Tierverhalten, Mariensee.
Steinhardt
M
M
Rath
D
D
Niemann
H
H
D000064:Acclimatization; D000375:Aging; D000818:Animals; D000831:Animals, Newborn; D002352:Carrier Proteins / Q000097:blood; D002417:Cattle / Q000097:blood*; D005260:Female; D007743:Labor, Obstetric / Q000097:blood*; D011247:Pregnancy; D012044:Regression Analysis; D013045:Species Specificity; D013961:Thyroid Gland / Q000254:growth & development / Q000378:metabolism; D013974:Thyroxine / Q000097:blood*; D014284:Triiodothyronine / Q000097:blood*
D002352:Carrier Proteins; D014284:Triiodothyronine; D013974:Thyroxine
Schilddrüsenhormone bei Saugkälbern der Rassen Alte Deutsche Schwarzbunte und Holstein Friesian. Einflüsse des Geburtsverlaufes und postpartale Anpassungsvorgänge.