Abstract. VERGARA GARAY, Oscar et al. GROWTH CURVE DETERMINATION FOR CREOLE HAIR SHEEP USING THE GOMPERTZ MODEL IN THE LOW. Estimación de curvas de crecimiento de codorniz japonesa utilizando el modelo Gompertz. Raji, A.O.1; Alade, N.K.1 and Duwa, H 1Department of Animal. El modelo Gompertz en el crecimiento de los cerdos .. La curva de Gompertz permite generar asimetría alrededor del punto de inflexión y alcanza este punto.

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The metabolic curve takes in to consideration the energy the body provides in maintaining and creating tissue. Modification of growth and development of muscles of poultry. However, parameter k maturation or growth rate was higher in males 0.

J Agric SciIt also offers an excellent opportunity for poultry farmers to enter a new and profitable poultry business especially in Nigeria where it was only recently introduced. Since the Gompertz model generally fits the growth of many mammals and chickens Hurwitz et al. This study aimed to determine the growth curve of two populations of crossbred sheep through the use of nonlinear Gompertz model.

Birds were weighed weekly from week 0 to week Similarly, the SD also increased with age as is common with time series data Aggrey ; Nahashon et al. Thus, this might be an evidence that the Gompertz equation is not good to model the growth of small tumors.


Spanish curca Article in xml format Article references How to cite this article Automatic translation Send this article by e-mail. Based on the above considerations, Wheldon [6] proposed a mathematical model of tumor growth, called the Gomp-Ex model, that slightly modifies the Gompertz law. S Afr J Anim Sci In addition, curve parameters provide information on growth characteristics.

This equation is known as a Gompertz function.

However, there is a fundamental difference: The letters c and a are constants. Moreover, the function makes use of initial growth rate, which is commonly seen in populations of bacterial and cancer cells, which undergo the log phase and grow rapidly in numbers. Thus, male quails gompwrtz faster than females and reached their weight at point of inflection and asymptotic weight at a younger age.

The right-hand or future value asymptote of the function is approached much more gradually by the curve than the left-hand or lower valued asymptote.

Gompertz function – Wikipedia

Descriptive statistics and degree of maturity for body weights at different ages of male and female Japanese quails are presented in table I. Population biology is especially concerned with the Gompertz Function. The metabolic function is particularly concerned with accounting for the rate of metabolism within an organism. A comparison of nonlinear models for describing weight-age relationships in cattle.

Influence of dietary energy and nutrient concentration on the growth of body weight and carcass components of broiler chickens. The application of exponential method in the analysis of growth curve for Japanese quail. Creoles; grazing; maturity; tropics.


Du Preez and Sales reported that this delay was likely to arise from the higher asymptotic value and consequently the longer growth period.

After hatching, the chicks were individually weighed and labeled before brooding for two weeks. The estimates of correlation Note that, in absence of therapies etc. Generally, females appeared to be heavier than males at all ages and this difference increased with age. Growth curves can be used for pre-selection of animals as it provides prediction of future growth cirva any age.

Wiseman and Lewis also employed the Gompertz to gomprtz the patterns of growth of live weight and carcass components in broilers.

Gompertz function

Thus, a strong and negative relationship J Appl Anim Res Thus, males matured faster than females though the latter had higher weights. The energy at rest is lower than the energy used to maintain a tissue, and together represent the energy required to maintain the existing tissue. Similarly, the inflection weight and maximum gain was higher for female quails than males.

The model can be written in this way:.