Results 1 to 10 of about 41,831 (231)

On the exponent in the Von Bertalanffy growth model [PDF]

PeerJ, 2018
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.
Katharina Renner-Martin, Norbert Brunner, Manfred Kühleitner, Werner Georg Nowak, Klaus Scheicher   +4 more
doaj   +5 more sources

Best-fitting growth curves of the von Bertalanffy-Pütter type. [PDF]

Poult Sci, 2019
A large body of literature aims at identifying growth models that fit best to given mass-at-age data. The von Bertalanffy-Pütter differential equation is a unifying framework for the study of growth models.The most common growth models used in poultry science literature fit into this framework, as these models correspond to different exponent-pairs (e ...
Kühleitner M, Brunner N, Nowak WG, Renner-Martin K, Scheicher K.   +4 more
europepmc   +5 more sources

Best fitting tumor growth models of the von Bertalanffy-PütterType. [PDF]

BMC Cancer, 2019
Longitudinal studies of tumor volume have used certain named mathematical growth models. The Bertalanffy-Pütter differential equation unifies them: It uses five parameters, amongst them two exponents related to tumor metabolism and morphology. Each exponent-pair defines a unique three-parameter model of the Bertalanffy-Pütter type, and the above ...
Kühleitner M, Brunner N, Nowak WG, Renner-Martin K, Scheicher K.   +4 more
europepmc   +5 more sources

Solución Numérica de la Ecuación Diferencial de Von Bertalanffy

Revista de Ciencias, 1998
En este artículo presentaremos las soluciones numéricas de la. ecuación diferencial de VON BERTALANFFY.
Jorge Rodriguez, Luis H. Romero N, Ana María Sanabria R.   +2 more
doaj   +2 more sources

A general Richards family growth curve fit in European livestock for use in physiologically-based toxicokinetic modelling [PDF]

BMC Veterinary Research
Background Physiologically-based toxicokinetic models in livestock need to account for growth during long-term exposure studies due to increase in tissue volume and subsequent dilution of concentration.
David Inauen, Leonie Sophie Lautz, Aalbert Jan Hendriks, Ronette Gehring   +3 more
doaj   +2 more sources

Extended von Bertalanffy Equation in Solow Growth Modelling

Algorithms
The aim of this work is to model the growth of an economic system and, in particular, the evolution of capital accumulation over time, analysing the feasibility of a closed-form solution to the initial value problem that governs the capital-per-capita ...
Antonio E. Bargellini, Daniele Ritelli, Giulia Spaletta   +2 more
doaj   +2 more sources

Nonlinear mixed models for characterization of growth trajectory of New Zealand rabbits raised in tropical climate [PDF]

Animal Bioscience, 2022
Objective The identification of nonlinear mixed models that describe the growth trajectory of New Zealand rabbits was performed based on weight records and carcass measures obtained using ultrasonography.
Vanusa Castro de Sousa, Daniel Biagiotti, José Lindenberg Rocha Sarmento, Luciano Silva Sena, Priscila Alves Barroso, Sued Felipe Lacerda Barjud, Marisa Karen de Sousa Almeida, Natanael Pereira da Silva Santos   +7 more
doaj   +1 more source

SOME NEW RESULTS OF A FRACTIONAL VON BERTALANFFY MODEL

E-Jurnal Matematika, 2023
In this article, we review the deterministic and perturbed Von Bertalanffy model that has been developing to discuss the existence and uniqueness results of the model.
AVAN AL-SAFFAR
doaj   +1 more source

Nonlinear equations to determine the growth curve of immunocastrated pigs [PDF]

Pesquisa Agropecuária Brasileira, 2020
: The objective of this work was to compare the performance of the nonlinear Gompertz, logistic, and von Bertalanffy equations, to describe the growth curve of immunocastrated male pigs from birth until reaching 140 kg body weight. Standard error, number
Marcos Speroni Ceron, Vladimir de Oliveira, Natielei Alexandre Nunes Novais Pieve, Nhayandra Christina Dias e Silva, Carlos Augusto Rigon Rossi, Bruno Neutzling Fraga, Henrique da Costa Mendes Muniz, Alexandre de Mello Kessler   +7 more
doaj   +2 more sources

The geometry of reaction norms yields insights on classical fitness functions for Great Lakes salmon. [PDF]

, 2020
Life history theory examines how characteristics of organisms, such as age and size at maturity, may vary through natural selection as evolutionary responses that optimize fitness.
Breck, James E, Lamberson, PJ, Low, Bobbi S, Rogers, Mark W, Rutherford, Edward S, Simon, Carl P   +5 more
core   +2 more sources