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OJVRTM
Online
Journal of Veterinary Research©
Volume 20(8):533-539, 2016.
Reference
thyroid, insulin and cortisol blood concentrations during lactation
and dry periods in high yield Holstein cows
Aliasghar Chalmeh*, Ali Hajimohammadi
Department of Clinical Sciences, School of
Veterinary Medicine, Shiraz University, Shiraz, Iran
ABSTRACT
Chalmeh A, Hajimohammadi
A., Reference thyroid, insulin and cortisol blood concentrations during
lactation and dry periods in high yield Holstein cows, Onl
J Vet Res., 20(8):533-539,
2016. Metabolic
hormones in 5 groups each of 5 high producing Holstein dairy cows in early, mid and
late lactations, and far-off and close-up dry periods are described. Blood or
sera triiodothyronine (T3), thyroxine (T4),
free T3 (fT3), free T4 (fT4), cortisol and insulin like growth factor-1 (IgF-1)
concentrations were determined. Reference values T3 varied
from 141 to 122ng/dl, T4 from 4.17 to 3.61ug/dl, FT3 from 2.82 to 3.29 to
2.52ng/dl, FT4 from 4.50 to 6.34ng/dl, igF1 from 53.40 to 86.2 ug/L and cortisol from 6.32 to 21.58
ng/ml during the different periods of lactation. Changes in T4 with T3
and FT4 with FT3 and IGF-1 with cortisol concentrations were correlated
(P<0.05) but cortisol negatively correlated with thyroid hormone levels.
Keywords: Metabolic
hormones, Correlation, High producing Holstein dairy cows.
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