Estimation of gain isoquants and a decision model application for swine production

Steven T. Sonka, Earl O. Heady, P. Fred Dahm

Research output: Contribution to journalArticlepeer-review


Historic estimates of livestock production functions have used repeated observations on the animals to estimate the overall gain surface. The estimates involve autocorrelation accordingly. To circumvent this problem, gain isoquants are estimated directly by means of an instrumental variable approach. Data are from a swine experiment designed for the purpose with 648 hogs. Protein supplement and corn serve as the substitute inputs. Protein supplement is estimated as the instrumental variable. Isoquant equations then are predicted for three weight intervals. Finally, a decision model is applied for economic choice. Comparisons are made for various price sets of recent years.

Original languageEnglish (US)
Pages (from-to)466-474
Number of pages9
JournalAmerican Journal of Agricultural Economics
Issue number3
StatePublished - Aug 1976


  • Autocorrelation
  • Decision model
  • Instrumental variable
  • Isoquants
  • Production function

ASJC Scopus subject areas

  • Agricultural and Biological Sciences (miscellaneous)
  • Economics and Econometrics


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