Blood concentrations of thyroid hormones and lipids and content of lipids in the liver of dairy cows in transitional period
2007
Djokovic, R.,University of Kragujevac (Serbia and Montenegro). Dept. of Animal Science | Samanc, H.,University of Belgrade (Serbia and Montenegro). Dept. of Diseases of Ruminants and Pigs | Jovanovic, M.,University of Belgrade (Serbia and Montenegro). Dept. of Pathology | Nikolic, Z.,University of Belgrade (Serbia and Montenegro). Dept. of Diseases of Ruminants and Pigs
The aim of the present investigation was to determine the correlation in the blood concentrations of thyroid hormones, lipids and glucose as well as the content of lipids in the liver of dairy cows in the transitional period. Forty animals were divided into four groups as follows: 1) late pregnant cows (n=10) from the 10th to 4th day before calving; 2) late pregnant cows (n=10) from the 4th to 1st day before calving; 3) clinically puerperal healthy cows (n=10); 4) puerperal cows with clinical symptoms of ketosis (n=10). Pathohistological examination of liver samples showed significantly higher lipid infiltration in ketotic cows than in healthy cows in late pregnancy and puerperium. Biochemical examination of blood serum showed significantly higher values of free fatty acids in ketotic cows, such as significantly lower blood concentrations of glucose, triacylglycerols, total cholesterol, triiodthyronine and thyroxine. Our investigations suggested that a hypothyroidal status was established in ketotic cows and that the blood concentrations of free fatty acids, triacylglycerols, total cholesterol and glucose served as major biochemical indicators in determining liver steatosis.
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