Mules are generally known to have fertility problem. How often do mules give birth to a healthy offspring?

usually
about 50% chance
very rarely
never
Mules are considered infertile, but there have been more than 60 documented cases of foals born to female mules around the world (some of them were even DNA-tested to verify the motherhood). There are no recorded cases of fertile mule stallions.
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Answers by country

usually
about 50% chance
very rarely
never
answers
flagAustralia
4%
16%
55%
23%
43
flagthe Netherlands
9%
9%
54%
27%
11
flagIndia
8%
16%
52%
22%
211
flagthe Philippines
5%
26%
52%
15%
19
flagGreece
5%
0%
50%
44%
18
flagthe United States
3%
25%
44%
24%
363
flagPoland
5%
21%
40%
32%
12653
flagGermany
8%
22%
40%
27%
135
flagSwitzerland
0%
31%
37%
31%
16
flagthe United Kingdom
6%
24%
35%
29%
145
flagRepublic of Ireland
5%
17%
35%
41%
17
flagPakistan
9%
14%
33%
42%
21
flagAustria
5%
31%
31%
31%
19
flagCanada
5%
44%
27%
16%
18