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<strong>EEP</strong> STUDBOOK CROWNED PIGEONS<br />
The experiment with the substrate<br />
In Rotterdam Zoo it first had been studied, with use of a Restricted Alternating Treatment<br />
within a SCRT, if the type of substrate did influence the time spent on the perches. From this<br />
it became clear that the male, with two parts of the surface covered with mould and one with<br />
sand, significantly spent more time on the perches than if one part was covered with mould<br />
and two with sand (59.26% versus 31.05%; n = 12, p = 0.001). No significant differences in<br />
the time budget of the female could be observed.<br />
The male spent more time standing on the trunks on the ground if more parts of the enclosure<br />
are covered with mould. This is both significant in comparison between 1 and 2 parts covered<br />
with mould (29.29% versus 7.99%; n = 12, p = 0.001) and with 1 and 3 parts covered with<br />
mould (29.29% versus 6.03%; n = 12, p = 0.045). For the female no significant differences<br />
were found.<br />
When changing the type of substrate, no significant differences could be found in time spent<br />
on the substrate, neither for the male nor for the female.<br />
Table 4: Time budgets (in %) of the male with different types of substrate<br />
(+*# = significant differences)<br />
Male 3 parts mould 2 mould, 1 sand 1 mould, 2 sand<br />
Perch 57.77 59.26* 31.05*<br />
Trunk 6.03+ 7.99# 29.29+#<br />
Ground/substrate 36.21 32.74 39.66<br />
As can be seen in Table 4, for the male the time spent on the perches decreases significantly,<br />
if there is less mould on the ground. If more parts are covered with mould, the male spent<br />
significantly more time on the trunks, but the time spent on the substrate did not change<br />
significantly.<br />
Table 5: Time budgets (in %) of the female with different types of substrate<br />
(+*# = Significant differences)<br />
Female 3 parts mould 2 mould, 1 sand 1 mould, 2 sand<br />
Perch 34.08 42.94 32.55<br />
Trunk 19.83 19.87 30.15<br />
Ground/substrate 31.48 25.90 37.18<br />
As can be seen in Table 5, the type of substrate did not significantly influence the time spent<br />
on the perches, trunks or the ground. If there is less mould, the time spent on the trunks and<br />
on the ground increases slightly but not significantly.<br />
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