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Firstly using the domestic goose, a seasonal breeder, changes in egg weight over the laying season, and changes in steroid hormone (androstenedione, testosterone, progesterone) concentrations in the outer layer of the egg yolk over the season are examined. Secondly, I am concerned with the phenomenon of ‘twinning’ in double-yolked eggs (multiple ovulations) in terms of a) its frequency, causation, and b) constraints on its evolution, and c) insights it may reveal about the incubation process itself. These studies were conducted with domestic ducks in a domestic environment when they lay all year round.\nGeese have limited endogenous reserves to invest in reproduction over a laying season, but will continue laying especially when feed supplemented and eggs are removed from the nest regularly. Here, even in feed supplemented adult geese the egg weight declined (weeks 1-8) to baseline levels and then – as was found in this study – the baseline weight was maintained until the end of the 19 week laying season. This weight loss is attributed to the female’s resource depletion and was accompanied with an increase in testosterone concentration over the laying season. The increase in testosterone is consistent with a trade-off for the seasonal decline in egg weight and viewed as a mechanism to compensate for small egg size affecting development, growth and / or behaviour of the offspring to enhance its survival and the mother’s fitness.\nDouble-yolked (DY) eggs are produced via multiple ovulations, when higher numbers of yellow follicles are recruited to the hierarchy. Here, evidence shows the increased prevalence of small DY eggs at the onset of laying in several batches of new layers. Further, differences in the physical appearance of DY and single-yolked (SY) eggs are presented and discussed. This thesis shows that the size and order of yolks in DY eggs influence albumen secretion and fertilization, ie. larger yolks stimulate the secretion of more albumen and have higher chance of achieving fertilization than smaller ones. Moreover, yolk position in DY eggs is related to fertility. 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