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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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These authors reported higher values for males than females.

Estimación de curvas de crecimiento de codorniz japonesa utilizando el modelo Gompertz

The function was originally designed to describe human mortality, but cueva has been modified to be applied in biology, with regards to detailing populations. Brit Poultry Sci All taxon s a group of one or more populations of an organism share a similar growth pattern and this model, as a result, considers cellular division, the foundation of the development of a tumor. Estimation of model parameters of the Japanese quail growth curve using Gompertz model.

The letters c and a are constants.

Thus, this might be an evidence that the Gompertz equation is not good to model the growth of small tumors. Animal model analysis of genetic co variance of growth traits in Japanese quail. This implies that the growth vompertz of the observed data were adequately described by the Gompertz function. The Gompertz model adequately described the growth of both male and female Japanese quails though the pattern of growth differed. Laird [4] for the first time successfully used the Gompertz curve to fit data of growth of tumors.


Comparison of three non-linear and spline regression models for describing chicken growth curves. Energy conservation can gokpertz used to model such growth, irrespective of differing masses and development times. Similarly, the inflection weight and maximum gain was higher for female quails than males. Similarly, they had lower gomprrtz weight and gain than female quail.

However, the inflection age weeks and weight grams reported for male and females respectively, in this study were lower than 2. Brody suggested that the asymptotic or mature weight, rate of attainment of mature weight and the standardized age at which an animal attained the inflection point of the curve are parameters that could be manipulated by geneticists.

Proceedings of 6 th Asian Pacific Poultry Congress. Moreover, more recently it has been noticed [7] that, including the interaction with immune system, Gompertz and other laws characterized by unbounded F 0 would preclude the possibility of immune surveillance. Birds were weighed weekly from week 0 to week Denoting the tumor size as X t it is useful to write the Gompertz Curve as follows:. Estimated coefficients for the Gompertz model parameters of the Japanese quail are presented in table II.

The metabolic function is particularly concerned with accounting for the rate of metabolism within an organism. Comparison of non-linear growth models to describe the growth in Japanese quail. It is a sigmoid function which go,pertz growth as being slowest at the start and end of a given time period.

National Veterinary Research Institute Press. Asymptotic weights from different studies should therefore be compared with caution.

The coefficient of determination R 2 was high for both male and female 0. This equation is known as a Gompertz function.

Descriptive statistics and degree of maturity for body weights at different ages of male and female Japanese quails are presented in go,pertz I. In this study, females reached inflection age three days later than males. From Wikipedia, the free encyclopedia. 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.


Gompertz function

Higher asymptotic weight in females has also been reported in the pearl gray guinea fowl Nahashon etal. Growth characteristics of pearl gray guinea fowl as predicted by the Richards, Gompertz, and Logistic Models. Ello explica chrva diferencias entre codornices japonesas machos y hembras en Nigeria. And it explains difference between males and females Chrva quail in Nigeria.

Heritability estimates of growth curve parameters and genetic correlations between the growth curve parameters and weights at different age of Japanese quail. The growth of most galliforms including poultry conforms closely to the shape of the Gompertz.

Gompertz function – Wikipedia

In addition, Mendes observed that the Gompertz model had better fit to weight-age, shank width-age, shank length-age, body length-age data than other gomperrz. This study was conducted to describe the growth pattern of Japanese quails with the Gompertz growth model using body weight measurements from an unselected, random bred quail population. One hundred and twenty one 54 male and 67 females Japanese quails hatched from eggs collected from unselected and random mating parents were used for the study.