The doctors from across the world proves that fertility among ladies drops after age of 30 it means that the ability of women to become pregnant decreases sharply from the age of 31 to that of 35. The chances for pregnancy were high from the age of 25 to that of 35 and declined rapidly thereafter

The research has health and social implications for women who, in increasing numbers, are delaying child-rearing to pursue professional careers or for other reasons.

The research was conducted among 2,193 women who were married to sterile men and who were trying to conceive through artificial insemination with donor semen. Over a period of about one year women were inseminated in 12 ovulation cycles and were given pregnancy tests at frequent intervals.

The physicians and scientists who conducted the study assert that this was a more reliable fertility research than had previously been done. The few previous studies had been complicated by such unknown factors as the degree of the husband's fertility, the frequency of the couple's sexual relations, and latent diseases.

The results showed that women 25 and under had a 73 percent rate of successful conceptions, those from 26 to 30 had a 74 percent rate, those from 31 to 35 had a rate of 61 percent, a significant drop of 13 percent from the lower age group. A relatively small group, 144 women, of those older than 35 had a 53 percent rate of success. In the latter group, there were 16 women over the age of 40.

The studies were conducted at 11 artificial insemination centers across France by physicians working with a federation of organizations for the study of human reproduction.

Although the subjects in the study were a special group with special problems, experts in the field said they believed the success in conceiving in this experiment would be roughly similar to that of women studied under different circumstances.