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Long term selection for four week body weight in japanese quail following modification of the selection environment



Long term selection for four week body weight in japanese quail following modification of the selection environment



Poultry Science 68(4): 455-459



The effect of changing the selection environment to maximize long-term genetic improvement in growth was investigated in selection for high 4-wk body weight in Japanese quail. This investigation involved three selected lines: Line P, selected under a 28% protein diet; Line T, selected under a 20% protein diet containing .2% thiouracil (TU), and Line S, a subline taken from the T line in Generation 27 and thereafter selected under a 28% protein diet containing TU. From Generation 27 to 70, 4-wk body weights increased 31%, 40%, and 51% in the T, and S lines, respectively. Selection differentials and intensities were significantly lower in the S line than in the P and T lines. Realized heritabilities calculated by dividing the cumulative response by the cumulative selection differential across the 43 generations were .05, .10, and .14 in the T, P, and S lines, respectively. These data indicate that changing selection environments may result in the release of additional additive genetic variation and thereby have a favorable effect on long-term genetic gains in body weight.

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Accession: 007522735

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DOI: 10.3382/ps.0680455


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