• July 6, 2019

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 males matured much earlier than females, but had lower asymptotic weights and gain at inflection point. 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 models. The Gompertz non linear model fitted to the body weight data was described by Se as: However, parameter k maturation or growth rate was higher in males 0. It also offers an excellent opportunity for poultry farmers to enter a new and profitable poultry business especially in Gompegtz where it was only recently introduced.

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. Poultry Sci Many authors also reported that sexual dimorphism was in favour of females in the Japanese quail Aggrey and Cheng, ; Aggrey et al.

These authors reported higher values for males than females. Quantitative laws in metabolism and growth.

The law rests upon an a priori assumption that a person’s resistance to death decreases as his age increases. In addition to its lean meat, the egg is lower in cholesterol as compared to chicken Musa et al.

Gompertz function

Thus, males matured faster than cruva though the latter had higher weights. Growth Kinetics of Tumors. The letters c and a are constants. The asymptotic weights for male and female Japanese quail in this study were lower than In addition, there is an inflection point in the graph of the generalized logistic function when.


Effect of long-term divergent selection on growth characteristics in Japanese quail.

Sin embargo, los modelos de crecimiento de las codornices machos y hembras, no son iguales. Modification of growth and development of muscles of poultry. The birds were housed at three weeks in cages 30x30x45 cm; with 2 birds per cage and had curvx access to feed and water. This study aimed to determine the growth curve of two populations of crossbred sheep through the use of nonlinear Gompertz model.

It se very short period months of rainfall of To assess growth characteristics in animals have been used mathematical models, which describe the relationship between the age of the animal, its rate of growth and maturity. Wiseman and Lewis also employed the Gompertz to study the patterns of growth of live weight and carcass components in broilers. This equation is known as a Gompertz function.

Growth curves for body weight and some body measurements of Ross broiler chickens. Thus, this might be an evidence that the Gompertz equation is gmopertz good to model the growth of small tumors.

The differentiation between energy used at rest and metabolic rate work allows for the model to more precisely determine the rate of growth. Thus, quails fed in different environment and have different genotype will have different asymptotic weight.

A comparison of nonlinear models for describing weight-age relationships in cattle. This page was last edited on 3 Decemberat Analysis of growth curves in fowl.

Animal model analysis of genetic co variance of growth traits in Japanese quail. Q Rev Biol SUMMARY 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.


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.

The most commonly used functions to estimate animal’s growth have three to four parameters. Services on Demand Cuurva.

gomperhz Mathematical Models in Cancer Research. Male and female Japanese quails had almost attained their mature weights at 12 weeks of age. Descriptive statistics and degree of maturity for body weights at different ages of male and female Japanese quails are presented in table I. Weight and age at the inflection point POI were calculated as: In this study, females reached inflection age three days later than males.

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

It is curvva to verify that the dynamics of X t is governed by the Gompertz differential equation:. Cudva however over and under estimated early weights weeks of the quails with little difference between observed and predicted weights thereafter.

Growth rate of different sexes of the European quail Coturnix coturnix. By using this site, you agree to the Terms of Use and Privacy Policy. The assumption that there is no competition for resources holds true in most scenarios.