男友太凶猛1v1高h,大地资源在线资源免费观看 ,人妻少妇精品视频二区,极度sm残忍bdsm变态

   

Nigeria's 'land of twins' baffles fertility experts

(Agencies)
Updated: 2007-11-13 07:34

IGBO-ORA, Nigeria -- Igbo-Ora, a sleepy farming community in southwest Nigeria, welcomes visitors with a sign proclaiming "The Land of Twins".


File picture of twins in Igbo-Ora, a sleepy farming community in southwest Nigeria, that welcomes visitors with a sign proclaiming "The Land of Twins". [Agencies]

"There is hardly a family here without a set of twins," said community leader Olayide Akinyemi, a 71-year-old father of 12, as he settled a dispute between two neighbours.

"My father had 10 sets, while I had three sets. But only one set, a male and a female, survived," he said.

The town's high incidence of twins has baffled fertility experts -- underscoring a more regional twin trend and an array of elaborate African rituals around them.

The rate of identical twins is pretty steady throughout the world at about 0.5 percent of all births, according to a 1995 study by Belgian researcher Fernand Leroy, who has worked extensively on twins.

But West Africa bucks that trend, particularly with a much higher incidence of fraternal, or non-identical twins than in Europe or Japan. That is especially true, experts say, amongst Nigeria's Yoruba community which is largely concentrated in the southwestern part of the country where Igbo-Ora is located.

Overall, almost 5 percent of all Yoruba births produce twins, the Belgian study said, compared with just around 1.2 percent for Western Europe and 0.8 percent for Japan -- although fertility drugs in the developed world are changing those figures.

Yam consumption may be one explanation for Africa's largesse, some West Africans and Western experts believe. Yams contain a natural hormone phytoestrogen which may stimulate the ovaries to produce an egg from each side.

For their part, Igbo-Ora's residents appear nonplussed about their twin phenomenon.

Some like Akinyemi support the yam theory -- and point specifically to the reputedly high oestrogen content of agida, the local name for yam tubers.

"We eat a lot of okro leaf or Ilasa soup. We also consume a lot of agida. This diet influences multiple births," he said.

Others are not so sure.

"The real cause of the phenomenon has not been medically found," said Akin Odukogbe, a senior consultant gynaecologist with the University Teaching Hospital (UCH) in Ibadan, the nearest big town.

"But people attribute the development to diet," he continued, adding that studies have shown that yam can make women produce more than one egg which can be fertilised.

Chief nursing officer at the hospital Muyibi Yomi, who records a monthly average of five twins for every 100 births, puts it all down to genetics.

"If a family has a history of multiple births, this will continue from generation to generation," she said.

   1 2   


Top World News  
Today's Top News  
Most Commented/Read Stories in 48 Hours
主站蜘蛛池模板: 宁安市| 湟源县| 应城市| 荣成市| 苍梧县| 雅江县| 含山县| 永昌县| 斗六市| 泸州市| 怀柔区| 株洲市| 康平县| 萨迦县| 濮阳市| 海口市| 抚顺市| 栾川县| 新绛县| 漯河市| 乌鲁木齐县| 定日县| 稷山县| 双鸭山市| 沙湾县| 遂昌县| 清涧县| 芜湖县| 高邮市| 顺昌县| 朝阳区| 泸州市| 潞城市| 临夏县| 新宁县| 乌兰察布市| 洞口县| 保亭| 兴业县| 镇赉县| 昌宁县|