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Nov 28

Costs and rates of egg formation in Ruddy Ducks. Total lipid reserve was carcass lipid plus lipid contained in yolk sacs; similarly, total protein was carcass lean dry mass plus yolk sac lean dry mass. Oxford University Press is a department of the University of Oxford. Energy requirements for existence in relation to size of bird. Sin embargo, polluelos grandes presentaron relativamente mayores reservas en el saco vitelino que polluelos pequeños. Conservation. Lipids comprised 61% of the dry yolk sac and, overall, yolk sacs contained 26% of total lipid reserves available to newly hatched ducklings. Dry egg yolk and lipid content increased in direct proportion to fresh egg mass, but whether large eggs contained proportionately more total egg energy than small eggs was equivocal (b = 1.19, 95% CI = 1.0–1.38; RMA, b = 1.25, 95% CI = 1.06–1.44). Egg wet mass comprised 54% albumen, 36% yolk, and 10% shell, whereas respective dry mass was 18%, 56%, and 26% (Table 1). 1998). %PDF-1.5 ftypjp2 jp2 Yjp2h ihdr - H colr ,res resdK�� K�� rescK�� K�� jp2c�O�Q ) H - H - �R �\ #"wv�v�v�o o n�gLgLgdPPPEW�W�Wa�d Kakadu-v6.3.1�d Y Kdu-Layer-Info: log_2{Delta-D(MSE)/[2^16*Delta-L(bytes)]}, L(bytes) J. M.Starck, and Ricklefs, SAS/STAT user's guide. Catabolism of egg lipid yields energy about 66% more efficiently than breakdown of protein (Ricklefs 1977), so egg energy is closely correlated with yolk mass. ]s];�#��Gb� �ү�p� ñsә����b���:I��d%9 ��!�OKē���- ��Ϲ{n�+�ĥ���;.! Relationships among fresh mass, incubation time, and water loss in Japanese Quail eggs. Large precocial offspring with greater energy reserves presumably could benefit from reduced risk of starvation during bad weather (Ankney 1980), additional energy for foraging and evading predators (Anderson and Alisauskas 2001), or enhanced thermoregulation (Rhymer 1988). Water averaged 69% of fresh egg mass, with water fractions comprising 87% of albumen and 42% of yolk. We thank Todd Arnold and Wendy Reed for support and helpful discussions; Shannon Badzinski, David Dobkin, Stuart Slattery, and two anonymous reviewers provided constructive manuscript reviews. -55.5, 1.1e+003 1987). We opened the peritoneal cavity, removed the yolk sac, and weighed (to the nearest 0.01 g) the yolk sac and wet yolk-free carcass. 1979, Hepp et al. Average clutch size is eight large eggs… �� Descriptive statistics of untransformed data are reported as means ± SD. -53.0, 5.1e+003 Nutrient composition of yolk in relation to early growth of Canada Geese. Guidelines to the use of wild birds in research. Higher functional maturity could enhance swimming capabilities (Anderson and Alisauskas 2001), making ducklings more adept at foraging and evading predators. A more aggressive duck, defending the breeding and nesting territory. Ducklings are preyed upon by Black-crowned Night-Herons, Ring-billed Gulls, California Gulls, mink, and raccoons. Relationship between body composition and homeothermy in neonates of precocial and semiprecocial birds. Composition and growth of King Eider ducklings in relation to egg size. Variation in the composition of the eggs and chicks of American Coots. 1987), and Mallard (0.45; Rhymer 1988). Search for other works by this author on: Prairie and Northern Wildlife Research Centre, Canadian Wildlife Service, 115 Perimeter Road, Saskatoon, SK S7N 0X4, Canada. Incubation is by female, 23-26 days. Jeffrey T. Pelayo, Robert G. Clark, Variation in Size, Composition, and Quality of Ruddy Duck Eggs and Ducklings, The Condor, Volume 104, Issue 2, 1 May 2002, Pages 457–462, https://doi.org/10.1093/condor/104.2.457. Large ducklings of other species also were better able to tolerate low temperatures (Koskimies and Lahti 1964, Rhymer 1988).

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