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  • 1
    ISSN: 1573-3297
    Keywords: selection ; dustbathing behavior ; heritability ; domestication ; natural selection ; Japanese quail
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Psychology
    Notes: Abstract Bidirectional selection was conducted for dustbathing activity in male Japanese quail over 17 generations. The response to selection was slightly asymmetrical, due mainly to scale effects and a threshold imposing discontinuity on the visible expression of dustbathing in the low line. Correlated responses to selection were found for latency to dustbathe, duration, intensity, and incidence of nonbathers. In general, changes followed linear patterns over time in both lines with the exception of quadratic change in nonbathers in the high line. Under artificial environment, only minor natural selection pressure is assumed to act on the expression of dustbathing behavior.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical and applied genetics 76 (1988), S. 775-780 
    ISSN: 1432-2242
    Keywords: Japanese quail ; Diallel cross ; Heterosis ; Gonad development ; Sexual dimorphism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The influence of growth on the extent of heterosis for juvenile body weight and gonad development was studied in a diallel cross among two lines of Japanese quail differing in adult body size. A total of 1,096 birds (563 males and 533 females) was slaughtered between 25 and 49 days of age. Reciprocal cross differences were non-significant. Heterosis showed a curvilinear course with age peaking during early growth (body weight) and during sexual maturity (gonad percentage). Overall advanced physiological development of the crossbreds probably begins as early as during the embryonic stages and results in earlier sexual maturity. In females, heterosis for percentage gonads was biased strongly by the presence of a hard-shelled egg in the uterus.
    Type of Medium: Electronic Resource
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