  In the paper is considered the use of a , $^{65}$Zn source in the BEST-2
gallium experiment to constrain the regions of the allowed oscillation
parameters. The required activity of the $^{65}$Zn source for the BEST-2
experiment, its size, effect on the results of oscillatory measurements, as
well as the possibility of production such a source are calculated. Schemes of
measurements execution are considered.
