The influence of hatching date on growth, molt, and body composition of juvenile mallards / Jacqueline J. Dixon.
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TextSeries: Thesis. (M.Sc.)Publication details: London, ON : University of Western Ontario, 1990.Description: xiii, 141 leaves : ill. ; 28 cmOnline resources: Abstract: Growth rates, body composition, digestive organ morphology, and prealternate molt characteristics were compared for captive-raised,wild-stock juvenile mallards (Anas platyrhynchos) from early, middle,and late nests in 1985. Growth rates of body weight, tarsus, bill, and wing lengths differed significantly with hatch date, but no consistent trends were evident. Lipid deposition of post-fledging mallards proceeded at similar rates regardless of hatch date. However, at a given age, late-hatched mallards had more total fat while early juveniles had the least amount of fat. Chronological predictions of increases in body weight and grams of fat indicated that early juveniles would be much heavier but have only slightly more fat than late ducks. Carcass protein of early-hatched birds increased as they got older whereas it remained constant in the others. Digestive organ size in mallards from early nests exhibited no change but generally decreased with age amont middle and late ducks. The a
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Thesis(M.Sc.)--University of Western Ontario, 1990.
"June, 1990."
Includes bibliographical references (leaves 126-138).
Growth rates, body composition, digestive organ morphology, and prealternate molt characteristics were compared for captive-raised,wild-stock juvenile mallards (Anas platyrhynchos) from early, middle,and late nests in 1985. Growth rates of body weight, tarsus, bill, and wing lengths differed significantly with hatch date, but no consistent trends were evident. Lipid deposition of post-fledging mallards proceeded at similar rates regardless of hatch date. However, at a given age, late-hatched mallards had more total fat while early juveniles had the least amount of fat. Chronological predictions of increases in body weight and grams of fat indicated that early juveniles would be much heavier but have only slightly more fat than late ducks. Carcass protein of early-hatched birds increased as they got older whereas it remained constant in the others. Digestive organ size in mallards from early nests exhibited no change but generally decreased with age amont middle and late ducks. The a