A 50 or 90% reduction in the number of fertile sperm deposited during mating probably will not markedly reduce fertility.
There are different ways to reduce fertility.
The demand to reduce fertility is there", he said.
And Mr Daly argues that it would not reduce fertility rates, as some people may fear.
Thus, high serum prolactin concentrations during lactation reduce fertility, protecting lactating women from a premature pregnancy.
The damage may reduce fertility by lowering sperm counts or reducing the sperm's ability to fertilise a woman's eggs.
Or should governments aggressively seek to reduce fertility with incentives and targets even before social progress is achieved?
These trends reduce fertility among the rich while leaving it higher among the poor.However, things change when income rises.
In this region and elsewhere, culturally entrenched patterns of early arranged marriage and childbearing make it difficult to reduce fertility.
The population grew to 166 by 1994, when the National Park Service asked Dr. Kirkpatrick to start a program to reduce fertility with P.Z.P.
The decline appears to have been in part the result of a variety of government programs to reduce fertility, including family planning and educational services.
