Abstract
The early (20 to 40 weeks of age) production record of a Randombred White Leghorn population was segmented by progressively truncating or incrementing 2- or 4-week segments of data. Genetic correlations between rate of lay of the annual record and rate of lay for segments of the early record and subsequent measures of efficiency of selection were computed. Segments in the first one-half of the early record were poorly correlated with the annual record, whereas those in the last one-third yielded correlations ranging from .84 to .98. Empirical measures of efficiency of selection based upon segments in relation to those based upon the early record produced values ranging from .83 to .97 for segments in the last 8 weeks of the early record.Use of selected segments in the latter part of the early record as a basis of selection for improvement in the annual record would reduce data collection costs at the sacrifice of a small loss in relative selection efficiency. The generation interval would not be shortened.
Published Version
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