Artificial insemination using cryogenically preserved spermatozoa has been widely used in human reproduction for several decades. No evaluation of the resulting pregnancies and conceptions has been undertaken in sufficiently large study populations for minor variations to be distinguished. This study involves 11,535 pregnancies conceived by artificial insemination using donor spermatozoa and fo...

Artificial insemination with homologous (AIH) or donor semen (AID) is nowadays a very popular treatment procedure used for many subfertile women worldwide. The rationale behind artificial insemination is to increase gamete density at the site of fertilisation. The sequence of events leading to today's common use of artificial insemination traces back to scientific studies and experimentation ma...

Intrauterine insemination (IUI) as a type of artificial insemination involves the placement of sperm directly into the uterus at the time of ovulation, either in a natural menstrual cycle or following ovarian stimulation. The process allows the concentration of sperm in a small volume of culture media and then the concentrated sperm is placed into the uterus through a transcervical catheter. IU...

Intrauterine insemination (IUI) as a type of artificial insemination involves the placement of sperm directly into the uterus at the time of ovulation, either in a natural menstrual cycle or following ovarian stimulation. The process allows the concentration of sperm in a small volume of culture media and then the concentrated sperm is placed into the uterus through a transcervical catheter. IU...

Colony genetic structure was studied in natural populations of three fire ant taxa, Solenopsis richteri Forel, S. geminata (Fabr.), arid hybrid S. inuicta/richteri, using allozyme markers. All colonies studied exhibited arrays of femalc gcnotypes predicted under a model of monogyny (single functional queen) and monoandry (single insemination of queens). Males produced in the colonies appear to ...

OBJECTIVE We evaluated the efficacy of fresh versus frozen sperm in therapeutic donor insemination. STUDY DESIGN Fifty-seven women underwent 72 courses of treatment (a maximum of six therapeutic donor insemination cycles--three fresh and three frozen) totaling 198 cycles. Each woman served as her own control and was prospectively randomized to receive a single, timed insemination of either fr...

Two experiments were conducted to determine whether prostaglandin F2~ (PGF2a) administered to does immediately before natural or artificial insemination would increase the retention of sperm in the reproductive tract. The PGF2~ was injected intramuscularly at 200 /~g/kg of body weight. In the first experiment, 16 estrous does, eight injected intramuscularly with PG2a, were mated naturally and n...