The content of lithium in the blood of cows with different vegetative status, depending on the time of the year
The results of studies of the influence of autonomic nervous system tonus on the content of lithium in the blood of cows depending on the time of year are presented. The content of metal in the serum, whole blood and blood cells of cows, depending on their vegetative status and season were 0.42-0.51 µg / 100 ml, 0.34-0.41 µg / 100 ml and 0.17-1.22 µg / 100 ml respectively. It is established that the time of year had a significant effect on the content of lithium only in serum and whole blood of cows in which the tonus of the sympathetic division of the autonomic nervous system predominated. The lithium content in the blood of cows and tonus of the autonomic nervous system dependence was confirmed. The predominance of the parasympathetic division of the autonomic nervous system influence on the heart, regardless of the season, does not effect the content of lithium in serum, whole blood and its cells. The predominance of the sympathetic division of the autonomic nervous system influence on the heart in summer had significant effect only on the content of lithium in blood cells – η²ᵪ = 0,58 (p <0,05), whereas in winter this influence became stronger – η²ᵪ = 0,73 ( p <0.01). Thus, in summer and winter, the content of this metal in the blood of sympathicotonic cows was significantly lower by 15.7% (p <0.05) and 15.9% (p <0.015), respectively, than that in normotonic animals.
Lithium content in different blood fractions had an inverse relationship with the tonus of the autonomic nervous system of cows in winter (r = -0.73-0.84; p <0.01-0.001), whereas during the warm season they became insignificant.
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