Hostname: page-component-cd9895bd7-8ctnn Total loading time: 0 Render date: 2024-12-26T07:56:04.526Z Has data issue: false hasContentIssue false
  • English
  • Français

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
Get access

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

Footnotes

†

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

References

Cöp, W. A. G. 1974. Protein and fat deposition in pigs in relation to body weight gain and feeding level. Communications, Agricultural University, Wageningen 74: 18.Google Scholar
Ellis, M., Smith, W. C., Henderson, R., Whittemore, C. T. and Laird, R. 1983. Comparative performance and body composition of control and selection line Large White pigs. 2. Feeding to appetite for a fixed time. Animal Production 36: 407–413.Google Scholar
Foster, W. H., Kilpatrick, D. J. and Heaney, I. H. 1983. Genetic variation in the efficiency of energy utilization by the fattening pig. Animal Production 37: 387–393.Google Scholar
Fowler, V. R. 1986. Biological advances towards genetic improvement in pigs. Proceedings of the third world congress on genetics applied to livestock production, Lincoln, Nebraska, vol. XI, pp. 345–354.Google Scholar
Greef, K. H. de, Verstegen, M. W. A. and Campbell, R. G. 1992a. Prediction of production, nutrition induced tissue partitioning in growing pigs. Ph.D. thesis, Wageningen Agricultural University.Google Scholar
Greef, K. H. de, Verstegen, M. W. A. and Kemp, B. 1992b. Validation of a porcine growth model with emphasis on chemical body composition. Livestock Production Science 32: 163–180.CrossRefGoogle Scholar
Kanis, E. and Vries, A. G. de. 1992. Optimization of selection for food intake capacity in pigs. Animal Production 55: 247–255.Google Scholar
Metz, S. H. M., Kamphuis, F. W., Mentink, A. C. M., Kanis, E., Peet-Schwering, C. M. C. van der and Verstegen, M. W. A. 1986. Simulation of growth performance in growing / fattening pigs. Proceedings of the 37 th annual meeting of the European Association for Animal Production, Budapest, Hungary.Google Scholar
Meuwissen, T. H. E. and Kanis, E. 1988. Application of bending theory in a pig-breeding situation. Livestock Production Science 18: 85–91.CrossRefGoogle Scholar
Mitchell, G., Smith, C., Makower, M. and Bird, P. J. W. N. 1982. An economic appraisal of pig improvement in Great Britain. 1. Genetic and production aspects. Animal Production 35: 215–224.Google Scholar
Moughan, P. J. and Verstegen, M. W. A. 1988. The simulation of growth in the pig. Netherlands Journal of Agricultural Science 36: 145–160.CrossRefGoogle Scholar
Rohr, P. von, Hofer, A. and Künzi, N. 1999. Economic values for meat quality traits in pigs. Journal of Animal Science In press.Google Scholar
Smith, C. and Fowler, V. R. 1978. The importance of selection criterion and feeding regimes in the selection and improvement of pigs. Livestock Production Science 5: 415–423.CrossRefGoogle Scholar
Tullis, J. B. 1981. Protein growth in pigs. Ph.D. thesis, University of Edinburgh.Google Scholar
Vries, A. G. de 1989. A model to estimate economic values of traits in pig breeding. Livestock Production Science 21: 49–66.Google Scholar
Vries, A. G. de and Kanis, E. 1992. A growth model to estimate economic values for food intake capacity in pigs. Animal Production 55: 241–246.Google Scholar
Webb, A. J. 1986. Genetic control of growth, composition, appetite and feed utilisation: non-ruminants. Options for genetic change. Proceedings of the third world congress on genetics applied to livestock production, Lincoln, Nebraska, vol. Xl, pp. 337–344.Google Scholar
Webb, A. J. and Curran, M. K. 1986. Selection regime by production system interaction in pig improvement: a review of possible causes and solutions. Livestock Production Science 14: 415–423.CrossRefGoogle Scholar
Whittemore, C. T. 1983. Development of recommended energy and protein allowances for growing pigs. Agricultural Systems 11: 159–186.CrossRefGoogle Scholar
Whittemore, C. T. and Fawcett, R. H. 1976. Theoretical aspects of a flexible model to simulate protein and lipid growth in pigs. Animal Production 22: 87–96.Google Scholar
Zbinden, P. 1998. Erstlingssauen zur kombinierten Erzeugung von Ferkeln und Qualitätsfleisch. Doctoral thesis nr. 12415, Swiss Federal Institute of Technology (ETH), Zurich.Google Scholar