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I am planning a fitness assay of Drosophila melanogaster. I'd like to get a good measure of lifetime reproductive success (lrs) but I don't want to count all the offspring produced over a lifetime by 100's of focal flies. The solution I am toying with is to count offspring production over the first few days or weeks. But before I commit to this I need to know if there is existing research material on the following:

Does early reproductive output correlate well with lrs? (this could be a low correlation if a fly trades early-life offspring production for late-life offspring production)

How much of a fly's reproductive output does one need to count before they have a good estimator of lrs? (does counting the offspring produced in the first day of life correlate well to overall lrs or do I need to count more - 5 days, 10 days, 50 days...)

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