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OJVRTM
Online Journal of Veterinary Research©
Volume 19(10):
672-678, 2015.
Blood thyroid hormone and circulating lipid profiles
in multiparous Holstein dairy cows
Aliasghar Chalmeh*, Ali Hajimohammadi,
Saeed Nazifi
Department of
Clinical Sciences, School of Veterinary Medicine, Shiraz University, Shiraz,
Iran
ABSTRACT
Chalmeh A, Hajimohammadi
A, Nazifi S., Blood thyroid hormone and circulating lipid
profiles in multiparous Holstein dairy cows, Onl J
Vet Res., 19(10): 672-678, 2015. Multiparous Holstein cows in early, mid
and late lactations, far-off and close-up dry periods were sampled for blood triiodothyronine (T3), thyroxine (T4), free T3 (FT3), free
T4 (FT4), cholesterol,
triglyceride (TG), high, low and very low density lipoproteins (HDL, LDL and
VLDL). Compared (P<0.05) with other
groups, cholesterol in mid and late lactation cows was higher. LDL in mid lactation
cows was highest and lowest in far-off dry cows. Glucose, TG, HDL and VLDL
values did not differ between groups. In early lactation cows T3 was higher. In
early and mid-lactation cows T4 was lower. Cows in early lactation had highest
FT3 whereas those with close-up dry periods lowest FT3. In far-off dry cows FT4
was higher. There were no correlations between any lipid value
except for TG with VLDL. T3 correlated
with T4 in all cows but not with FT3 or FT4.
FT3 correlated with FT4 in all groups. Cholesterol correlated with TG
and T3 and T4 in all cows.
Keywords: Thyroid
hormones, Lipid profile, Correlation, High producing Holstein dairy cows.
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