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No. Unless there has been a rooster to inseminate the hen, the eggs will not be fertile.
Digging holes is just something many cichlids do. It may mean the fish is getting ready to spawn but in the case of the (Laboratory made) Parrot cichlids, it is unlikely you will get fertile ova if they do spawn.
In theory, yes. Any two fertile species may interbreed, but their young would be sterile.
There are plenty of reasons you could be having a problem. The first set of reasons are "operator error" - did you inseminate 12 hours after observing a standing heat? Did you inseminate into the uterus, completely through the cervix? Did you keep the semen straws frozen properly until useage? The second set of reasons are "cow problems" - does the cow have a normal uterus? Does the cow ovulate, or is she developing cystic ovaries? Does the cow have fertile oocytes? Both sets of problems can be easily evaluated by your veterinarian - after 6 months, I would suggest paying the farm call fee and have him/her out.
Most fertile is the superlative for fertile.
more fertile, most fertile
That would be the FERTILE CRESCENT.
The address of the Fertile Library is: 101 S Mill St, Fertile, 56540 4215
NO - it is FERTILE.
Fertilis, fertile
fertile
no