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Originally Posted by bchgirl  This is totally false. The eggs can be fertilized at differnet times but do not develop until they implant in the uterine horn....which occurs all at the same time. Development of the puppies is solely based on where they implant. A under developed puppy simply did not have ultrarium placement in the womb. |
That a heartbeat can be detected within 2 days of implantation shows that development does occur before implantation. Also, implantation, as I have read, is a process that I liken to a graft taking place.
Everything is described as a phase...the release of the hormones that trigger the eggs, the maturation of the eggs, the fertilization of the eggs and implantation in the uterus.
I ran across an old study on mice that showed that showed the area nearest the ovary was the most favored implantation site as far as fewer fetal deaths and abnormalities go. It didn't address normal, but less developed fetuses, however.