(a) : In artificial insemination technique, the semen of a healthy donor male is collected and is introduced artificially through a flexible polyethylene catheter into the vagina or into uterus called intra­ uterine insemination $(IUI)$. Best results are obtained when the motile sperm count is more than $10$ million. The fertilizing capacity of spermatozoa (sperms) is for $24-48$ hours. The procedure may be repeated $2-3$ times over a period of $2 -3$ days.