I'm not really sure what to make of your question. There are many individual females of every animal species on this planet that are infertile. Unless there's environmental factors involved, infertility is often caused by a mutation. Most environmental factors that cause infertility due so by way of mutation too but that's irrelevant to Deserts.
The desert morph is also caused by a mutation. It is not inconceivable to suggest that color and infertility are linked by the same mutation. This would result in infertile female Deserts. Several examples of similar mutation linkage were given above.
The question isn't whether infertile female animals existbut whether the reproduction difficulties are husbandry based or are an innate infertility caused by mutation. One is surmountable, one is not, either is possible.









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