EXPERIMENTAL STUDY OF THE DEVICE TO MASSAGE THE UDDER OF HEIFERS TWO-CHAMBER TY PE
One of the important directions in the improvement of the mechanization of training heifers to lactation is the development of devices for combined (pneumatic and mechanical) effects on the mammary gland of animals. Such effects, achieved through massage devices dual-chamber type allows you to eventually obtain a synergistic effect in improving animal productivity through better development of their mammary gland and reduce the risk of disease mastitis fresh cows in the initial period of the use of milking machines. Experimental studies of the massaging device of this type is made using a specially designed laboratory stand. Implementation of the experiment with a matrix of almost D - optimal plan of type Bn and the statistical processing of the results allowed to obtain a mathematical model describing the dependence of the pressure (vacuum) in the massage in the bell strokes of massage and the unloading from the free volume massage of the casing, the frequency of the pulsator, and the diameters of the inlet of the power chamber and the calibrated hole, which connects the power chamber with the cavity of the casing massage. Analysis of the data shows that the developed design of the massage device provides a physiologically reasonable impact on the mammary gland of heifers at the expense of individual control over the intensity of pneumatic and mechanical components of massage. As a reasonable value for the diameter of the calibrated hole, which connects the power chamber with the cavity of the casing and massage may be recommended adjustable interval in the range of 3,5-4,5 mm.