COMPETITION BETWEEN FRESH AND AGED SPERMATOZOA IN FERTILIZING RABBIT EGGS

The fertilizing life of spermatozoa in the rabbit oviduct.

Fertilizing ability of spermatozoa from aged C57BL/6NNia mice.

Spermatozoa from C57BL/6NNia mice (7- and 25-month-old males that produced offspring and 25-month-old males incapable of producing offspring which either mated or did not mate after being paired for 1 month with proven-fertile females) were tested in in-vitro fertilization studies. The 7-month-old males fertilized the largest number of oocytes (80-86%) in vitro and 79% of them subsequently deve...

Motility and Fertilizing Capacity of Rabbit Spermatozoa after Freezing in a Medium Containing Dimethyl Sulfoxide.

REsPONSE oF SPERMATOZOA to freezing varies according to species. Hoagland and Pincus observed that rabbit spermatozoa could scarcely revive following immersion in liquid nitrogen after various plasmolytic pretreatment, whereas human spermatozoa remained highly active after freezing and thawing. It has been reported that rabbit spermatozoa are easily damaged by hypertonic salt solutions at tempe...

Use of boar spermatozoa for artificial insemination. II. Fertilizing capacity of fresh and frozen spermatozoa in gilts inseminated either at a fixed time or according to Walsmeta readings.

A fertility trial was conducted comparing two methods of defining the optimum time to inseminate frozen boar semen. One hundred sixty-four gilts were inseminated, one-half at a fixed insemination time of 32 to 34 h after calculated onset of estrus and the remainder were inseminated on the basis of changes in the vaginal mucosal electrical resistance. Inseminations were made when the instrument ...

Interaction between Prostasomes and Spermatozoa – Roles on the Sperm Fertilizing Ability

Prostasomes are known as extracellular organelles originating from the epithelial cells of the prostate and detected in its secretions where they are mixed with sperm cells after ejaculation. They were first described in men but are also present in the semen of all mammals studied. Since their characterization by Gunnar Ronquist in the late 1970’s studies have focused on different aspects which...