Correlated response of fitness to selection for 5-week body weight
is studied in a mixed quail population. Three groups are selected at random
from this population. Selection is applied for 5-week body weight in the
group C, and for fitness, i.e. number of offspring surviving up to 5th
week, in the group D. The third one(K) is used as control.
The data obtained in the- inital generation showed that the selection
for fitness in the group D resulted in rather high indirect selection
differentials for its components, such as the number of hatching and
fertilized eggs, and the number of offspring hatched while the 5-week body
weight of the selected parents remained unchanged. In the selected parents
of the group C, on the other hand, the traits other than the body weight
itself kept their original values. A rather high genetic improvement in
weight was observed in the first generation of the group C, the realized
heritabilities being .62 in females and .38 in males.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XI. Genetics of reproduction, lactation, growth, adaptation, disease, and parasite resistance., , 431–436, 1986
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