Typological features of the nervous system of cows depending on the reactivity and stress resistance
L.V. Karlova, O.G. Gavrilina, N.V. Alekseeva, O.V. Peretyatko
The article analyzes of stimulus of the central nervous system of Ukrainian red dairy cows, depending on the typological features of their higher nervous activity. The type of higher nervous activity was determined by the reaction of stimulation and inhibition using 20 % sodium bicarbonate solution of caffeine and conditional stimuli: sound (bell, tone high, tone low) and light (light white, light blue). The expediency of using a caffeine test for objective and more precision characterization of individual properties and typological features of the nervous system of cattle has been established. The dose of caffeine for cows with a strong, balanced, mobile type of nervous system was the highest – 1.08 ± 0.04 cm3 (P < 0.05). In cows with a weak type of higher nervous activity, the transcendens dose of caffeine is 0.45 ± 0.03 cm3, which causes inhibition, weakness, inertia and inequality of the nervous processes. Animals of the weak type have significantly lower initial excitability, are least reactive to the activating factors, form a conditional positive and negative connections with a higher load, the strength of which is low. The consequence of this is the slight restraint of the system of conditionally and unconditionally reflexes. Accordingly we investigat the lactic productivity of animals for I-III lactation using data from zootechnical records. The obtained data testify to the unequal adaptive capacity of cows of different types of nervous activity to external conditions. In cows of high types of higher nervous activity, unlike animals of the weak type, the level of milk production processes is higher, which confirms daily milk yield at a high percentage of dry substance and fat content in milk. It was established that the properties of cows nervous processes more influence on the milk indices (33.01 %; P < 0.01) and milk fat (16.01 %; P < 0.05) and less on the fat content of milk (2.34 %) On the basis of conducted complex studies was proved, the advantage of using animals of a strong, balanced, mobile type of the nervous system, which allows not only to increase milk productivity, but also to improve the component composition of milk.