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The Growth Curve of Pigs between 134 and 174 Days of Age¹

Iowa State College

Abstract

The growth curves of 255 pigs weighed at 134, 144, 154, 164, and 174 days of age were essentially linear over this period. The growth curves varied for particular pigs, each seeming to be a linear function of the freight attained at a given age. A common intercept of –45 days on the age axis and — 154 lb. on the weight axis fitted the data for both fast and slow-growing pigs, assuming linearity of growth over the period from 134 to 174 days.

Several possible methods of adjusting weights to a standard age (154 days) were examined. One of the most accurate and convenient was:

Linear interpolation is also accurate and convenient when two weights on each animal are available.

¹ Journal paper No. J-2676 of the Iowa Agricultural Experiment Station, Ames, Iowa. Project No. 1127. The project is cooperative with the Regional Swine Breeding Laboratory, Ames, Iowa.

² Present address. Wye College, Near Ashford, Kent, England.