Modelling the profile of growth in monogastric animals

E. Kebreab; A.B. Strathe; C.M. Nyachoti; J. Dijkstra; S. López; J. France

Modelling the profile of growth in monogastric animals

in Modelling nutrient digestion and utilisation in farm animals

Autor:innen:

E. Kebreab

E. Kebreab ¹Department of Animal Science, University of California, Davis 95156, USA; ekebreab@ucdavis.edu

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A.B. Strathe

A.B. Strathe ²Section of Nutrition, Department of Basic Animal and Veterinary Sciences, Faculty of Life Sciences, University of Copenhagen, 1870, Frederiksberg, Denmark

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C.M. Nyachoti

C.M. Nyachoti ³Department of Animal Science, University of Manitoba, Winnipeg MB R3T 2N2, Canada

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J. Dijkstra

J. Dijkstra ⁴Animal Nutrition Group, Wageningen Institute of Animal Sciences, Wageningen University, Marijkeweg 40, 6709 PG Wageningen, the Netherlands

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S. López

S. López ⁵Instituto de Ganadería de Montaña (IGM), Universidad de León, Consejo Superior de Investigaciones Científicas (CSIC), Departamento de Producción Animal, 24071, León, Spain

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J. France

J. France ⁶Centre for Nutrition Modelling, Department of Animal and Poultry Science, University of Guelph, Guelph, Ontario N1G 2W1, Canada

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Art:: Kapitel

Seiten:: 386–393

DOI:: https://doi.org/10.3920/9789086867127_043

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Growth functions have been used in animal science for over a century to summarize time course data on the growth of an organism. The chapter aims to review growth functions that have been used in monogastric animal nutrition. Although the Gompertz equation (1825) has been used extensively, particularly to describe growth in pigs, alternative functions have been shown to perform better. The Gompertz and the logistic equations have a fixed point of inflexion while the Richards, López (Morgan) and von Bertanalffy equations have a flexible point of inflexion. This might give the latter an advantage over simpler equations, despite an additional parameter required to obtain flexibility. In almost all studies that compared growth equations, the López (Morgan) equation has consistently shown to be superior to the other equations in describing pig and poultry growth data. An additional important point is that time course data by nature are repeated measures on the same animal or group of animals, therefore, consideration of correlation structure is needed when using any type of growth function. All studies reviewed showed that an autoregressive correlation structure improved equation prediction significantly and should be part of the analysis. Most growth functions struggle to come up with a good estimate of initial body weight regardless of fitting procedure. However, because the objective of using a growth function is primarily to estimate rate of . and time to reach market weight, this limitation does not preclude their use in animal science.

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Modelling nutrient digestion and utilisation in farm animals

ISBN:: 9789086867127

Verleger:: Wageningen Academic

Print-Publikationsdatum:: 30 Oct 2010

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Modelling the profile of growth in monogastric animals

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Modelling nutrient digestion and utilisation in farm animals

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