External Fertilized Ovums Grow Better in GroupsChinese scientists claimed that it would improve the quality of embryo and increase preganancy rate if more than one ovums fertilized in vitro were cultivated together.Traditionally doctors cultivated only one oosperm each time in order to keep close watch on it and avoid interactive pollution among the oosperms. But the latest study by a group of Chinese scientists in northeast China's Heilongjiang Province showed that more growth factor will be secreted if more than one oosperms were cultivated together. As a result, women who recieve such oosperms are easier to get pregnant with better embryos, said Zhang Yulan, head of the research group. Zhang and her partners have done the experiment with 323 ovums fertilized in vitro. The pregnancy rate was up by nearly six percentage points. |
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