Abstract: Method of artificially inseminating a plurality of animals with aliquots of sperm obtained from a breeding stock individual of that species, obtained by fractionating the collected semen into first and second motile-sperm containing fractions, the first of which is free from immotile sperm and non-sperm components, both suspended in a liquid vehicle which is physiologically acceptable to the sperm and for artificial insemination; dividing the first and second fractions into a plurality of aliquots, each of which contain enough motile sperm to ensure a pregnancy when used for an artificial insemination; artificially inseminating a plurality of individuals of that species in which a predominance of male offspring is desired with the aliquots of the first fraction; and artificially inseminating a plurality of individuals of that species in which a predominance of male offspring is not a desired objective with the aliquots of the second fraction.

Abstract: The likelihood of conceiving a female fetus is substantially enhanced by promoting ovulation in a fertile female mammal with an ovulation-inducing agent and artificially inseminating the female mammal during the period of expected ovulation with a sperm fraction of enhanced sperm motility from which immotile sperm and non-sperm seminal components have been separated and which is suspended in serum albumin or like physiologically acceptable vehicle.

Abstract: The percentage of the motile sperm of semen which survives frozen storage is increased by a process wherein the motile sperm is separated from the immotile sperm and the non-sperm components of the semen prior to storage. An insulated collection kit for collecting semen protects the semen from the adverse effects of handling and thermal shock.