METHOD FOR RETENTION OF RARE AND DISAPPEARING ANIMAL KINDS Russian patent published in 2006 - IPC A01K67/02 

FIELD: animal farming.

SUBSTANCE: method involves distributing 48 sires in 4 groups (A, B, C, D), each of 12 head; distributing females in 12 groups, 10-15 in each group; inseminating first group females with sperm of first sire 1A, second group females with sperm of second sire 2A, ... twelfth group females with sperm of twelfth sire 12A; leaving one best daughter from each of 10-15 mothers in each of 12 groups for further reproduction; inseminating first generation daughters from first group mothers and father 1A with sperm of sire 2A; inseminating best daughters from second group mothers and father 2A with sperm of sire 3A; inseminating best daughters from twelfth group mothers and father 12A with sperm of sire 1A; providing parent rotation until 6^th generation females are produced; inseminating best 6^th generation females with sperm of their great-great-great-great-grandfathers (1A, 2A ... 12 A); inseminating best 7^th generation females from first group mothers and sire 1A with sperm of sire 1B and best 7^th generation females from second group mothers and sire 2A with sperm of sire 2B, and best 7^th generation females from 12^th group mothers and father 12A with sperm of sire 12B; providing rotation of group B sires similar to that of rotation of group A sires until 13^th generation progeny is obtained; inseminating best 13^th generation females in each of 12 groups with sperm of great-great-great-great-fathers (1B, 2B,... 12B); inseminating best females of 14-20 generations with sperm of group C sires according to above pattern; beginning from 21st generation, inseminating best females with sperm of group D sires according to the same pattern; beginning new cycle after 28 generations when the former cycle is closed, with best bulls selected from 7^th generation (1An, 2An,... 12An) being used as sires-successors of microstock of first group A, best bulls produced from 14^th generation (1Bn, 2Bn,... 12Bn) being used as sires-successors of group B sires, best bulls produced from 21st generation (1Cn, 2Cn,... 12Cn) being used as sires-successors of group B, and best bulls produced from 21st generation (1Dn, 2Dn,... 12Dn) being used as sires-successors of group D.

EFFECT: increased efficiency by retaining limited stock of rare and disappearing animal kinds without employment of close inbreeding.

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