Why equine hybrids are infertile?

hybrids such as zebroid=zebra+horse, liger=lion+tiger,mule=donkey+horse....

Why equine hybrids are infertile?
Because they have an odd number of chromosomes in their cells. In order to have fertile sex cells the chromosomes numbers have to be split in half. For example a donkey has only 60 chromosomes in a normal cell and 30 in a sex cell. A horse as 66 chromosomes in a regular cell and 33 in a sex cell. When the sex cells combine together the offspring has 63 chromosomes in the cells and the sex cells have like 31.5 chromosomes which is not a full number and therefore infertile.
Reply:Well, that is a common misconception, there are in fact female mules that become pregnant every year (just not all of them). Just this year, one herd in Colorado had like 2 or 3 mollys that were exposed to a stallion with the rest of the mares and turned up pregnant and gave birth (naturally) to viable offspring.


Also, zorse mares (zebra +horse) can have offspring that even carry on their traits and color patterns. I just saw this mare and her foal for sale in Idaho, check out the links.





http://dreamhorse.com/show_horse.php?for...





http://dreamhorse.com/show_horse.php?for...





One more thing, ligers are not equine.

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