Abstract
Ten Ross' Geese, 14 hybrid Snow – Ross' Geese, and 4 Snow Geese were raised together at McConnell River, Northwest Territories. The birds fed on native vegetation, supplemented by dog food. Measurements taken at regular intervals of weight, tarsus length, culmen length, and culmen height were fitted to the Gompertz curve, and the three growth parameters derived therefrom were subjected to genetic analysis. Results showed that Ross' Geese had more genes contributing to a higher growth constant than Snow Geese, but little allelic dominance was observed. Snow Geese grew to a larger final size, with evidence that dominance was more important in that process. Reasons for the faster growth but smaller adult size are discussed with reference to the severity of conditions on nesting areas during the gosling period.
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