title: [Changes in biochemical indicators in dairy cows induced by extremely low temperatures].
abstract: The objective of the experiment was to find out the effect of extremely low temperatures on the biochemical characteristics of the cows. Twenty-one dairy cows were used as the experimental material. The experimental group (n = 12) was kept loose in an open barn without thermal insulation and the control group (n = 9) was kept in an insulated cow-house. The winter season included two periods of extremely low temperatures: from the 3rd to the 21st of January 1985 the average minimum temperature in the open barn was -12.6 degrees C and the lowest temperature was -19 degrees C, and in the period from the 8th to the 20th of February 1985 the average minimum temperature was -13.1 degrees C and the lowest recorded temperature was also -19 degrees C. At the beginning of hypothermic stress, the concentration of non-esterified acids and total proteins increased in the cows of the experimental group; potassiaemia was decreased in this group. Cholesterolaemia and glycaemia increased during the long-continued exposure to low temperatures. The activity of the thyroid gland was increased at all measurements.
mesh_terms: D000818:Animals; D001786:Blood Glucose / Q000032:analysis; D001798:Blood Proteins / Q000032:analysis; D002417:Cattle / Q000097:blood*; D003080:Cold Temperature; D005230:Fatty Acids, Nonesterified / Q000097:blood; D005260:Female; D006728:Hormones / Q000097:blood; D008055:Lipids / Q000097:blood; D008903:Minerals / Q000097:blood
chemical_list: D001786:Blood Glucose; D001798:Blood Proteins; D005230:Fatty Acids, Nonesterified; D006728:Hormones; D008055:Lipids; D008903:Minerals
vernacular_title: Zmeny biochemických ukazovatel'ov dojníc vyvolané extrémne nízkymi teplotami.