Female moths of Bombyx mori were artificially inseminated with cryopreserved semen. The fertility of inseminated females varied from 0% to 76.9% depending on the strain. Addition of fresh semen from triploid males, which are infertile but whose semen includes intact apyrene sperm, greatly improved fecundity of cryopreserved semen from normal males. Frozen apyrene sperm from the triploid donors ...

Mice carrying a germ-line null mutation of the prolactin receptor gene have been produced by gene targeting in embryonic stem cells. Heterozygous females showed almost complete failure of lactation attributable to greatly reduced mammary gland development after their first, but not subsequent, pregnancies. Homozygous females were sterile owing to a complete failure of embryonic implantation. Mo...

The alpha-fetoprotein gene (Afp) is a member of a multigenic family that comprises the related genes encoding albumin, alpha-albumin, and vitamin D binding protein. The biological role of this major embryonic serum protein is unknown although numerous speculations have been made. We have used gene targeting to show that AFP is not required for embryonic development. AFP null embryos develop nor...

objective: the measurement of follicular output rate (fort) has been proposed as a good indicator for evaluating follicular response to the exogenous recombinant folliclestimulating hormone (rfsh). this places fort as a promising qualitative marker for ovarian function. the objective of the study was to determine fort as a predictor of oocyte competence, embryo quality and clinical pregnancy af...

BACKGROUND Infertility is a major psychosocial crisis as well as being a medical problem. The factors that predict psychosocial consequences of infertility may vary in different gender and different infertile populations. OBJECTIVE The primary purpose of this study was to investigate whether Turkish infertile couples had higher levels of depression and anxiety when compared to non-infertile c...

Because the quality of mating partners varies, females of several taxa have evolved the ability to discriminate against low-quality mates. Although males in the Hymenoptera are usually haploid, diploid males may occur in species with complementary sex determination. Diploid males are almost always sterile in most of the species studied so far. They are thus of very low quality as mating partner...

Introduction: Many women of reproductive age experience polycystic ovary syndrome (PCOS), characterized by growth cysts on the ovaries that range in size from 2 to 10mm antral measurement, oligomenorrhea, menorrhagia, acne and hyperandrogenism. Objective: The study aimed correlate rational PCOS with infertility women. Place Duration: was conducted different districts Sindh Pakistan during perio...

Background: Infertility problem has become to a social concern and many couples experience it during their reproductive years. This problem has substantial negative impacts on their life and especially on their sexual relationships. The purpose of this study was to determine the impact of counseling on sexual satisfaction of infertile women referred to infertility clinics in Tabriz. Materials a...

All mammalian eggs are surrounded by a relatively thick extracellular coat, called the zona pellucida (ZP), that plays vital roles during oogenesis, fertilization, and preimplantation development. The mouse egg ZP consists of three glycoproteins, called mZP1-3, that are synthesized solely by oocytes during their 2-to-3 week growth phase. The ZP is seen initially as isolated extracellular deposi...

Maternal hormones in vertebrate eggs can mediate important forms of maternal effects. However, the function of hormone transfer to the eggs is still debated, especially because long-term fitness consequences have been little studied. We investigated the effect of prenatal exposure to physiologically elevated yolk testosterone (T) levels on reproduction of female pheasants (Phasianus colchicus) ...