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The Register of Performance for Swine

Armour's Livestock Bureau and Iowa Agricultural Experiment Station

Abstract

Selective Methods in Vogue for Livestock

A fundamental basis for effective selection is the principal requirement for constructive livestock breeding. The judging of livestock based on external characters, and performed by experienced breeders, may be credited with the enormous progress since animals were first domesticated by prehistoric men. The highly efficient purebred livestock of to-day probably represents the culmination of this method of improvement, and most students of scientific breeding feel that additional methods must be developed if further progress is to be secured.

Certain qualities of great economic importance, as milk secretion and egg production, can not be judged with sufficient accuracy even by the most expert eye. The regular weighing of the milk from each individual cow, the testing of the fat content of the milk by means of the Babcock test, and the trap-nesting of hens, are modern means of getting down to more fundamental methods of discriminating between desirable and undesirable animals.