Method and means for controlling the sex of mammalian offspring

Details Method and means for controlling the sex of mammalian offspring Method and means for controlling the sex of mammalian offspring

1980-08-18

1984-10-02

Waddell, Frederick E.

Chemistry: molecular biology and microbiology

Maintaining blood or sperm in a physiologically active state...

A01N 102

Patent

active

044748752

ABSTRACT:
A method of controlling the sex of mammalian offspring by separating spermatozoa into fractions having the desired sex characteristics and artificially inseminating the female to produce offspring of the desired sex. The sperm is separated by applying a buoyant force or forces to a mixture of sperm in nutrient media so that separation occurs according to density of the sperm. The nutrient media is controlled as to density characteristics and can have a uniform density gradient from top to bottom so that buoyant forces within such media are selectively applied to sperm of different density to effect separation of the sperm and to hold sperm fractions of different density in suspended relation within the nutrient media. Substantially pure sperm fractions (having the desired male or female sex characteristics) are isolated at the top or at the bottom of a separation column for use in artificially inseminating the female. Under certain circumstances, separation of the sperm into fractions is enhanced by the application of gas pressure (positive or negative) above the mixture of sperm and nutrient media in the column.

REFERENCES:
patent: 3185623 (1965-05-01), Smith et al.
J. Reprod. Fert (1966) 11, 469-472, Schilling.
Bhattacharya, Reprint from "Zeitschrift fur Wissenschaftliche Zoologie", Akademishe Verlagsgesselschaft Geest & Portig K.G., Leipzig.
Chemical Abstracts, vol. 68, 1963, 66311n.
The Australasian Journal of Pharmacy, Science Supplement, No. 77, Jul. 1969, pp. 549 and 550.

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