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Divergent Selection for Growth in Japanese Quail Under Split and Complete Nutritional Environments.

Poultry Science, ISSN: 0032-5791, Vol: 70, Issue: 3, Page: 453-462
1991
  • 21
    Citations
  • 0
    Usage
  • 9
    Captures
  • 0
    Mentions
  • 171
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    21
    • Citation Indexes
      21
  • Captures
    9
  • Social Media
    171
    • Shares, Likes & Comments
      171
      • Facebook
        171

Article Description

Divergent selection during Generations 12 to 20 for high (H) and low (L) 4-wk BW under split-(SD) and complete-(CD) diet environments resulted in continued progress in both upward and downward directions. Following 20 generations of selection, there were 4.8- and 3.6-fold differences between BW of H and L lines in the SD and CD environments, respectively. Regression coefficients of mean 4-wk BW on generation of 1.88 and 158 g in the H lines and −1.50 and −1.37 g in the L lines indicated symmetrical selection responses. Realized heritabilities for 4-wk BW ranged from.2 to.4; selection differentials were significantly (P<.01) larger in the H lines than in the L lines. Directional changes in 2-wk and adult BW and in egg weight across generations were similar to that of the selection trait (4-wk BW). Selection resulted in decreased hatchability and egg production and an increase in the age of sexual maturity. However, these changes were smaller than corresponding changes observed in earlier generations (0 to 11). Egg size of lines selected in the SD environment continued to be larger than egg size of corresponding lines in the CD environment. Considerable genetic variation for BW remains under both SD and CD environments following 20 generations of divergent selection. Smaller gains resulting from lower heritabilities agree with theoretical expectations of decreasing responses accompanying continuous selection.

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