This work aims to propose a new model named Gompertz-Von Bertalanffy bicompartmental (GVB), combination of the models Gompertz and Von Bertalanffy. The GVB is applied fit kinetic curve cumulative gas production (CGP) four foods (SS – sunflower silage; CS corn mixtures 340SS 660 gkg-1 silage 340 660SS silage). compared Logistic-Von (LVB) logistic (BL). All process studied employed semi-automatic...

This work aims to compare different nonlinear functions for describing the growth curves of Nelore females. The growth curve parameters, their (co)variance components, and environmental and genetic effects were estimated jointly through a Bayesian hierarchical model. In the first stage of the hierarchy, 4 nonlinear functions were compared: Brody, Von Bertalanffy, Gompertz, and logistic. The ana...

We have determined that the different plastral scutes (rigid sectional plates found on the plastron, the flat shell structure of a turtle’s ”belly”) of Blanding’s turtle grow at different rates, while scute pairs grow homogeneously. Scute width was used as a new growth measurement to model the growth curve of Blanding’s turtle by fitting exponential and polynomial models. We discovered that the...

Ludwig von Bertalanffy is known as founding father of the General System Theory (GST). When Ludwig von Bertalanffy created his GST amidst the last century, he was able to overcome the deep cleft between the controversial theoretical approaches to biology – mechanicism and vitalism. He did so by formulating laws of organisation ruling biota and after generalising them he successfully applied the...

A maximum likelihood approach is described for the analysis of growth increment data derived from tagging experiments. As well as describing mean growth this approach allows the separate estimation of measurement error and growth variability, and uses mixture theory to provide an objective way of dealing with outliers. The method is illustrated using data for Pacific bonito (Sarda chiliensis) a...

KINGSLEY, M. C. S. 1979. Fitting the von Bertalanffy growth equation to polar bear age-weight data. Can. J. Zool. 57: 1020-1025. Heavy sea ice in the Canadian Arctic in the winter of 19731974 reduced seal populations; polar bears, preying principally on seals, consequently lost weight. The nature and degree of this weight loss was investigated by examining the parameters of von Bertalanffy grow...

Von Bertalanffy proposed the differential equation m'(t) = p × m(t) a  - q × m(t) for the description of the mass growth of animals as a function m(t) of time t. He suggested that the solution using the metabolic scaling exponent a = 2/3 (Von Bertalanffy growth function VBGF) would be universal for vertebrates. Several authors questioned universality, as for certain species other models would p...

The modular construction of colonial organisms can generate complex growth patterns that incorporate both growth and partial mortality. These patterns often confound simple age based descriptions of growth but, in some cases, modularity can generate predictable patterns of colony growth that are amenable to modeling approaches more commonly used in unitary organisms. Colonies of the Caribbean g...

The objective of this study was to examine the growth pattern of three size measurements, namely body weight, body length, and height at withers of Jamnapari and Boer goats reared under common semi-intensive environment in Johor, Malaysia. Cross-sectional data of the above measurements of 234 Jamnapari and 312 Boer female goats (age ranged from 6 to 54 months) were used to fit Gompertz and von ...

Common snook Centropomus unidecimalis is an important commercial and fishery species in Southern Mexico, however the high exploitation rates have resulted in a strong reduction of its abundances. Since, the information about its population structure is scarce, the objective of the present research was to determine and compare the age structure in four important fishery sites. For this, age and ...