. The Canadian field-naturalist. 9 Weight in lbs. 27-r. 60 Females 8 9 Weight in lbs. Figure 1. Distribution of weights within ilb. classes of Canada Geese captured near Look- out Point, Thelon River, birds which have not completed all of their feather moult as two distinct cate- gories. Apparently under the stress of moulting, body fat reserves break down and the size of the pectoral muscles is reduced through protein katabolism. The weight of these muscles during the flightless period of the moult is 30 and 36 per cent less in males and 25 and 41 per cent less in f
. The Canadian field-naturalist. 9 Weight in lbs. 27-r. 60 Females 8 9 Weight in lbs. Figure 1. Distribution of weights within ilb. classes of Canada Geese captured near Look- out Point, Thelon River, birds which have not completed all of their feather moult as two distinct cate- gories. Apparently under the stress of moulting, body fat reserves break down and the size of the pectoral muscles is reduced through protein katabolism. The weight of these muscles during the flightless period of the moult is 30 and 36 per cent less in males and 25 and 41 per cent less in females (for yearlings and adults respectively), than the average weights of these muscles at the end of migration. When flight is again possible, the weight of the pectoral muscles increases Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ottawa Field-Naturalists' Club. Ottawa, Ottawa Field-Naturalists' Club
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