A kimiyyar jima’i da mace, akwai wani abu da ake kira da ‘Shettle Method’. Ma’ana, hanyar da ake bi domin zaɓar jaririn da mutum yake so ya haifa a lokacin da zai tara da matarsa (Seɗ).
Kafin mace ta ɗauki ciki, akwai wani abu da ake kira da ‘Timing intercourse’ da kuma ‘Oɓulation period’. Ma’ana, lokacin da ake tsammanin fitowar ƙwan mace daga ‘oɓaries’ ɗinta tare da yiwuwar lokacin da yake ɗauka kafin ya zagwanye, idan ba a sadu da macen ba, a daidai wannan lokaci. A tsakanin wannan lokacin ne, masu bincike suka nemo dalilin shigowar wannan kimiyya ta ‘Shettle Method’.
Har ila yau, ƙwan da mace take fitarwa daga ‘oɓaries’ ɗinta tare da maniyyin da namiji yake fitarwa daga mararsa, dukkaninsu suna ɗauke da ƙwayoyin halitta guda biyu, wanda a dunƙule muke kira da ‘Chromosomes’.
Waɗannan ‘chromosomes’, su ne sinadaran samun ƙwayar halittar mace ko namiji, sakamakon su kaɗai ne suke ɗauke da ‘genetic make up na Ɗ & Y chromosomes’. ‘Ɗ-chromosome’, yana nufin ƙwayar halittar mace, sannan Ƴ-chromosome’, yana nufin ƙwayar halittar ɗa Namiji.
Ga yadda bayanin yake:
Kwana uku kafin mace ta fara ‘oɓulation’, wato lokacin da za ta fara shirye-shiryen fito da ƙwan da yake cikin ‘oɓary’ ɗinta, don jiran maniyyin namiji ya zo ya ƙyanƙyashe mata shi, to a wannan sauran kwana ukun ne, indai har namiji ya sadu da mace; shi ne binciken ya nuna cewa, za a iya samun haihuwar ƴa mace, saboda ƙwan da mace take fitarwa kai tsaye; yana ɗauke ne da ‘Ɗ-chromosome’, wanda yake ɗigowa a hankali daga ‘oɓary’ ɗinta, sannan yana iya kai wa har tsawon kwana bakwai bai lalace ba.
Haka zalika, da za a ce yau ne mace za ta fara wannan ‘oɓulation’ nata, indai a yau ɗin mijinta ya sadu da ita, zai yi wahala ba a haifi ɗa namiji ba. Dalili kuwa shi ne, wannan ƙwayar halittar ta ɗa namiji (Y-chromosome), ita ce kai tsaye take zuwa ta doki wannan ƙwan da mace ta fitar, saboda maniyyin namijin yana ɗauke ne da Ƴ-chromosome’, sannan kuma yana da yawa fiye da na ‘Ɗ-chromosome’ ɗin da mace ta fitar a wannan ranar.
Wannan ne yasa Ƴ-chromosome’, ba ya wuce iya kwana uku kacal daga ranar da mace ta fara ‘oɓulation’, indai har mijinta ya sadu da ita a wannan ranar.
Idan aka lura da kyau, za a ga cewa; ‘Ɗ-chromosome’, (Ƙwan mace), ba shi da yawa, amma yana daɗewa sosai har tsawon kwana bakwai kafin ya lalace. Shi kuma Ƴ-chromosome’, (Ƙwan namiji), yana da yawa sosai, amma ba ya daɗewa saboda kwana uku ne kaɗai yake iya yi, kafin ya lalace.
Wannan ne dalilin da ya sa ake haifar mata da yawa a duniya kafin a haifi ɗa namiji, saboda ƙalilan ne cikin mutane suke iya riskar wannan ranar da mace take fara yin ƙwai ‘oɓulation’. Mafi yawan mutanen duniya, suna yin jima’i ne kusan kullum yadda suke so, saɓanin sa’ar riskar wannan rana. Bincike ne ya nuna hakan, amma Ubangiji ne kaɗai mai yin yadda ya so; ba wai abin da wannan bincike ya bayyana kai tsaye ba, wannan shi ne ainahin batu na gaskiya.
