the pregnancy would not survive. the sperm and egg of different species are incompatible. technically a pregnancy may begin but will soon spontaneously terminate. a human has 46 chromosomes with the male and female each contributing 23 chromosomes to their offspring. a horse has 64 chromosomes with the male and female each contributing 32 chromosomes to their offspring. a union between a horse and human would result in a shared chromosome total of 55. therefore the egg recognizes the irrational number of chromosomes and rejects the pregnancy.
can a female human get pregnant from a horse? . i do not think i am pregnant with a horse's baby but could this even happen?