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Two growth models to estimate economic values for food intake capacity in pigs

Published online by Cambridge University Press:  18 August 2016

P. von Rohr ,
A. Hofer  and
N. Künzi
P. von Rohr
Affiliation:
Department of Animal Science, Swiss Federal Institute of Technology, ETH-Zentrum CLU, CH-8092 Zurich, Switzerland
A. Hofer
Affiliation:
Department of Animal Science, Swiss Federal Institute of Technology, ETH-Zentrum CLU, CH-8092 Zurich, Switzerland
N. Künzi
Affiliation:
Department of Animal Science, Swiss Federal Institute of Technology, ETH-Zentrum CLU, CH-8092 Zurich, Switzerland
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Abstract

Economic values for average ad libitum food intake capacity (FIC) were estimated with two different linear-plateau models. One model based on a constant minimum fat to protein deposition ratio (Rmin). The other model relied on a constant minimum marginal ratio between fat and protein deposition (MR). Economic values were used to define aggregate genotypes where the driving variables of the growth models were considered as traits. The consequences of a possible implementation of such aggregate genotypes were evaluated with a comparison of the expected selection responses for the different traits.

Economic values for the traits under the two models indicated the same direction of selection and differed only slightly in their magnitude. For a FIC below its optimum, FIC had a positive and Rmin or MR a negative, economic value. In this situation the maximum protein deposition rate Pdmax had no influence on the production costs and therefore an economic value of zero. Selection emphasis is then mainly put on FIC which leads to an increase in average daily gain (ADG). If FIC is above its optimum, economic values for FIC were negative, positive for Pdmax and equal to zero for Rmin or MR. Practically no differences between the selection responses under the two growth models were observed.

The use of growth models to estimate economic values for FIC allowed to attribute a positive economic value to this trait if it is below its optimum. This is not possible when economic values are estimated with an economic production model.

Keywords

food intakegrowth modelspigsselection criteria
Type
Research Article
Information
Animal Science , Volume 69 , Issue 1 , August 1999 , pp. 49 - 57
Copyright
Copyright © British Society of Animal Science 1999

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Footnotes

†

Present address: Department of Dairy Science, Virginia Tech, 264 Litton Reaves Hall, Blacksburg V A 24061, USA.

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