  Experimental excitation functions for long-lived products in proton induced
reactions were measured with the activation method in the 37-65 MeV energy
range on natural holmium. Stacked foil irradiation technique and high
resolution gamma spectrometry were used in order to measure cross-section data
for the production of $^{161}$Er, $^{160}$Er and $^{159,157}$Dy. For comparison
of the production routes of medically related $^{161}$Er and $^{160}$Er
radioisotopes new experimental cross section data were deduced for the
$^{162}$Er(p,x)$^{161,160}$Er and $^{162}$Er(d,x)$^{161,160}$Er reactions by
re-evaluating gamma-ray spectra from earlier measurements. No earlier data were
found in the literature for these reactions. The experimental data are compared
with results of TALYS theoretical code reported in TENDL-2015.
