Sigmoid growth analyses of wood ducks: the effects of sex, dietary protein and cadmium on parameters of the Richards model

Journal Article · · Growth; (United States)

OSTI ID:6840131

Brisbin, Jr, I L; White, G C; Bush, P B; Mayack, L A

Growth analyses were conducted for 194 captive-reared wood ducks, using reparameterized Richards process error model which provided estimates of: (1) asymptotic size (W/sub infinity/); (2) an approximation of the amount of time required to complete the growing period (T); and (3) the Richards shape parameter (m). Multivariate analysis of variance indicated that growth was affected by sex and the level of cadmium in the diet on which the birds were reared (0-100 ppm). Crude protein in the diet (high = 30%; low = 18%) did not affect growth. Univariate analyses indicated that the growth of the sexes differed only with respect to W/sub infinity/, with males growing to larger body weights than females. Cadmium, however, altered both T and m, with longer times being required to complete growth in both controls which received no cadmium, and at higher levels of cadmium intake. Intermediate treatment levels completed growth in the shortest periods of time. Increasing cadmium intake altered the shape of the growth curve by progressively delaying the time at which maximum growth rate occurred.

• Research Organization: Savannah River Ecology Lab., Aiken, SC
• DOE Contract Number: AC09-76SR00819; W-7405-ENG-36
• OSTI ID: 6840131
• Journal Information: Growth; (United States), Journal Name: Growth; (United States) Vol. 50:1; ISSN GROWA
• Country of Publication: United States
• Language: English

Related Subjects

560300* -- Chemicals Metabolism & Toxicology
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ANIMAL GROWTH
ANIMALS
BIRDS
CADMIUM
DUCKS
ELEMENTS
FOWL
GROWTH
MATHEMATICAL MODELS
MATHEMATICS
METALS
MULTIVARIATE ANALYSIS
ORGANIC COMPOUNDS
PROTEINS
SEX DEPENDENCE
STATISTICS
TOXICITY
VERTEBRATES