Summary
7. SUMMARY
The production quail is an activity that comes presenting considerable
development in the last years, thanks to the quality of its products (meat and eggs),
its cost of production and to the use of the available technologies, as the hygienical-
sanitary, nutrition, cares and the use of ancestries produced for the genetic
improvement. In this direction, the objectives of this work had been to analyze in a
system of diallel crossings between ancestries of quail of position, characteristics of
economic interest, of quality of eggs, the components of the position curve and the
tax of profit observed with of eggs. For this a system of diallel crossing was used
involving three ancestries, producing nine groups of lines, being three parental ones
(pure), three reciprocal F1 crosses and three F1 crosses, totalizing 972 quail. Nine
repetitions of each group had been used, with 12 quail in each river steamer
(experimental unit). The diallel analyses had been developed of univariate form,
from resultant genotypes combinations of a design entirely randomized. The effect
of combining ability general, combining ability specific and reciprocal effect had
been esteem. The studied characteristics had been: weight of the egg, daily feed
intake, egg number for quail lodged, percentage of position for quail lodged, feed
efficiency, mortality, components of the position curve, specific gravity, height of
albume, Haugh unit, egg yolk percentages, shell and albume and tax of profit. For all
the characteristics of economic interest, had not been observed effect of the general
capacity of combination when it considered the periods. Already for specific
capacity of combination, these characteristics had inside presented great variation of
the periods and revealed significant for weight of the egg, feed efficiency for kg and
egg box and for mortality. The lines of the crossing 1x2 had presented greaters
weights of eggs, and the lines of the crossing 1x3 had better presented feed efficiency
for kg and egg box and minor mortality tax. Such effect do not specify which of the
ancestors would have to be used as male or female in the elect crossing, and for this
the reciprocal effect are appealed to it, that more define the sex of the recommended
ancestors. This effect alone was observed for the characteristic weight of the egg,
where lines of crossings between males of the ancestry 2 and females of ancestry 1
had been able to provide to greater weight of egg, important characteristic mainly
when it commercializes eggs for kg. In the majority of the characteristics of internal
quality of the egg effect of general capacity of combination had not been found,
exception made for specific gravity of the egg in two partial periods and for