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  • 1
    Electronic Resource
    Electronic Resource
    Correlated response in male and female sterility to selection for pupa weight in Tribolium castaneum (1971)
    Springer
    Theoretical and applied genetics 41 (1971), S. 197-202 
    Details
    ISSN: 1432-2242
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The correlated responses in male and female sterility to 50 generations of individual selection for pupa weight in Tribolium were analyzed. Two replicate lines (S-lines) were selected for heavier pupa weight and stabilizing selection for pupa weight was practiced in two replicate control lines (C-lines). There was close agreement between replicates in both sets of lines for direct and correlated responses. The rate of inbreeding has been constant for all lines (approximately 0.5% per generation). Regression of generation means for pupa weight on generation of selection indicated a significant linear regression in the direct response for both lines. The linear increases of 46 and 55 μg. per generation in the S-lines accounted for 98% of the variation among generations and the linear decreases of 5 and 10 μg. per generation in the C-lines accounted for 70–90% of the variation in the generation means. Maximum likelihood estimators were used to calculate the frequency of male and female sterility for each generation and line. Average sterility in the base population ranged from about 4 to 12% for both sexes. Polynomial regressions of percent sterility on generation of selection showed that quadratic and higher order regressions were occasionally significant but accounted for a relatively small fraction of the total variation. In the two S-line replicates, linear regression coefficients of percent sterility on generation number were 0.16±.09 and 0.20±.07 for males and 0.72±.08 and 0.54±.08 for females, suggesting a larger correlated response in female than in male sterility. In the C-lines, linear regression coefficients were 0.02±.08 and −.12±.05 for males in the two replicates and −.05±.05 and −.05±.05 for females. Estimates of realized genetic correlations between pupa weight and sterility in the S-lines ranged from 0.04 to 0.14 for males and from 0.14 to 0.37 for females when the heritability of sterility was allowed to take on values from 0.05 to 0.25.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00279769
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  • 2
    Electronic Resource
    Electronic Resource
    Effects of mating system in Japanese quail (1984)
    Springer
    Theoretical and applied genetics 67 (1984), S. 407-412 
    Details
    ISSN: 1432-2242
    Keywords: Japanese quail ; Selection ; Mating system ; Heritability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A 17-generation selection experiment was conducted to study direct and correlated responses to mass selection under a mating system with alternating generations of full-sib inbreeding and wide outbreeding (population I) as compared with a mass selected, randomly mated population (population II). The selection criterion was an index of total egg mass to 78 days divided by adult female body weight. Estimates of heritabilities and genetic correlations are reported. Estimated heritabilities for the index were 0.38±0.04 and 0.29±0.05 in population I and II, respectively. Realized heritabilites were 0.10±0.05 and 0.12±0.03. For most traits studied the mean phenotypic values in the cyclic mated population decreased for inbred generations. Increased inbreeding levels also caused outbred generation means of population I to decrease through the first six or seven generations. After this period of adaptation to inbreeding selection response was positive for the index and positively correlated traits. Total response to selection under the cyclic inbred-outbred mating system did not exceed selection response made under random mating. However, the rate of response in the cyclically mated population exceeded that in the randomly mated population in later generations when the cyclically mated population had apparently adapted to inbreeding.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00263402
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  • 3
    Electronic Resource
    Electronic Resource
    Effects of mating system in Japanese quail (1984)
    Springer
    Theoretical and applied genetics 67 (1984), S. 403-406 
    Details
    ISSN: 1432-2242
    Keywords: Japanese quail ; Inbreeding ; Mating system ; Fitness
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A selection experiment, conducted for 17 generations, compared a selected population mated in a cyclic manner with alternating generations of inbreeding and outbreeding, a selected population mated at random and a randomly mated, randomly selected control population. Trends in the number of birds available for selection and number selected are presented for each population. Actual and theoretical levels of inbreeding for each population were similar. Samples of all populations were subjected to continuous full-sib inbreeding at generation 12. All populations were sensitive to inbreeding depression. However, the cyclic mated population had greater reproductive fitness after continued intensive breeding.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00263401
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