The north-east also had the lowest conception rate for all those between 15 and 44, at 70.6 conceptions per 1,000, while London had the highest overall conception rate at 85.2.
The conception rate using sexed sperm is lower in cows, though it is higher in primiparous cows.
In fact, there is no hard evidence that reducing the ability of teenage mothers to claim benefits reduces the conception rate.
In England, the north-east had the highest under-18 conception rate, at 30.6 per 1,000 girls aged 15-17.
She found that young women in Denmark have a significantly lower natural conception rate than in past decades.
In Southwark, an inner-London borough, the conception rate for girls under 18 has fallen by 64%.
However, from 1998-2008, teenagenage conception rate fell only by 13.3% in under-18s and by 11.7% in under-16s.
"Meanwhile, the conception rate for older women has risen steadily, as women wait longer to start their families," said Clare Murphy, Bpas director of external affairs.
Surgical reversal of vasectomy is somewhat more successful, achieving success about 80 percent of the time, but the conception rate following such reversal remains low.
Office for National Statistics figures released in February showed that the UK under-18 conception rate remains the lowest since 1969, at 27.9 per 1,000 women aged 15 to 17.
He has been doing his bit for the recovery of his kind, with well over 100 mares booked for this year and his conception rate as strong as ever.
