The rational and long term use of pedigree cocks in the selection of hen of egg direction productivity

Abstract

The problem of expedience and efficiency of the use of two- and
three-year cocks in the selection of bird of egg direction
productivity with cell technology of maintenance and in the system
of artificial insemination has been researched. Sperm quality of
cocks does not change with the age, reproductive capabilities of old
cocks and indices of incubation qualities of eggs at the use them in
the system of artificial insemination are not diminished. Egg
productivity of daughters, got from the cocks of the first year,
substantially lower, than from daughters, got from 2–3-years-old
cocks. It is recommended to use old cocks very limitedly and,
mainly, on groups of multipliers of clean lines for an increasing
desirable genotypes in the flock. Cocks in age of 2–3 years are fully
estimated on genetic and reproductive parameters and their use in
breeding of egg bird increases the selection effect.