Abstract
Rates of weight loss were calculated for eggs incubated by spruce grouse (Dendragapus canadensis) during 1977 to 1984 in New Brunswick. The mean rate of weight loss was 0.18 g/d during the first 20 days of incubation. Rates of loss differed among clutches, were greater for eggs of adult versus yearling females, and were greater for large than for small eggs. Variances of egg volume indices were greater among than within clutches, but volumes did not differ among eggs of adult versus yearling females. Enough variation occurred in rates of weight loss that they cannot be used to predict the ages of eggs (number of days into incubation).
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