Influence of the types of higher nervous activity in cows on the milk flow process

Abstract

The aim of the research was to study the effect of the type of higher nervous activity on the excretory function of the mammary gland. Cows are classified according to the types of higher nervous activity (HNA): First type - strong, balanced, mobile; Second type - strong unbalanced; Third type - strong inert; Fourth type – weak breaking. Under standard milking conditions, in cows of the first higher nervous activity type there were observed: a tendency or a significant increase in single milk yield and milking time in comparison with other types. The conditioned stimulus “foreign milkmaid”, when applied once or twice, caused an increase in the number of milk flow cycles in first and second higher nervous activity type cows with a decrease in the duration of one cycle both in the morning and lunchtime milking, compared with standard conditions. The following positively correlates with the intensity of milk flow: single milk yield, the milk flow rate for the first and second minutes of milking and maximum, the percentage of milk yield for the first and second minutes, the number of milk production cycles for two, three minutes and in general for milking. Negatively correlates the time of milk yield, the achievement of the maximum rate of milk flow and the total milking time. The process of inhibition of milk flow weakens these connections. The type of higher nervous activity in cows affects the relationship of indicators of milk flow both under conditions of varying degrees of readiness for milk flow, and action of conditioned and unconditioned stimuli on the animals used in the experiment.