ISSN:
1432-2242
Keywords:
Growth curve
;
Genetic parameters
;
Heritability
;
Mice
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Summary Data from 1,919 outbred ICR mice were used to examine the potential usefulness of growth curve parameters as selection criteria for altering the relationship between body weight and age. A logistic growth function was used to model growth through 12 weeks of age. Estimates of asymptotic weight (A), maximum growth rate (r) and age at point of inflection (t*) were obtained by nonlinear least-squares. A log transformation was also used to stabilize residual variance. Phenotypic and genetic parameters were estimated for the estimated growth curve parameters and for body weights at 2, 3, 4.5, 6, 8 and 12 weeks of age. Heritabilities of estimated growth curve parameters (obtained with and without a log transformation, respectively) were: A (0.28±0.07, 0.28±0.07), r (0.35±0.07, 0.53±0.09) and t* (0.41±0.08, 0.44±0.08). Estimated genetic correlations suggest that t* may be useful in selecting for rapid early growth without increasing mature weight.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00288846
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