Comparer des méthodes

	Ajustement de courbes de croissance chez le bétail	Ratio de conversion alimentaire
Domaine	Zootechnie	Zootechnie
Famille	Process / pipeline	Process / pipeline
Année d'origine	1970s	1950s
Auteur d'origine	Animal Biologists and Agricultural Statisticians	Animal Nutrition Scientists
Type	statistical modeling	efficiency calculation and analysis
Source fondatrice	Menchaca, M. A., & Chase, C. C. (2002). Body measurements and condition scores for beef cattle. Veterinary Clinics of North America: Food Animal Practice, 19(3), 387-405.	Blaxter, K. L. (1989). Energy metabolism in animals and man. Cambridge University Press.
Alias	growth model fitting, trajectory analysis, growth kinetics modeling	feed efficiency ratio, gain-to-feed ratio, FCR analysis
Apparentées	3	3
Résumé	Growth curve fitting is the mathematical modeling of animal body weight and size changes over time. Developed by animal biologists and statisticians in the 1970s-1980s (Fitzhugh), the method applies nonlinear regression to weight data, extracting parameters that characterize growth rate, time to maturity, and asymptotic mature weight. Curve fitting supports comparisons of genetics, nutrition, and management effects on growth efficiency and enables prediction of market weight and slaughter timing.	Feed conversion ratio (FCR) is a key metric of nutritional efficiency in livestock, measuring the amount of feed consumed relative to animal growth or product output. Developed by animal nutrition scientists in the mid-20th century, FCR quantifies how efficiently livestock convert dietary nutrients into meat, milk, eggs, or other products. It is a primary driver of profitability in commercial animal agriculture and a focus of genetic selection in breeding programs.