Wool is divided into two broad classes, apparel-wool and carpet-wool, produced by different breeds. The aim of selection is to improve production, and within each class four main steps are followed in developing a programmer
a) Defining production, b) Estimating parameters for the characteristics defined, c) Formulating breeding plans, and checking by experiment, cl) Investigating physiological differences between sheep differing genetically in wool production, so as to improve selection criteria or provide a basis for developing improved sheep types.

H. N Turner, Dunlop A A

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 1, Madrid, Spain, 739–756, 1974
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