Sheep vary greatly, even within breeds, in the number and size of folds in the skin. At one time producers were emphasizing the importance of having a large number of skin folds in fine wool sheep such as the Merino and Rambouillet. This was based on the belief that skin folds were associated with high yields of grease wool and fineness of wool fibers. In recent years the trend has been toward a smoother bodied sheep with longer staple and less grease in the fleece.
The objects of this bulletin are to present a review of the available information concerning the relative merits of sheep differing in the amount of skin folds, and to present information on the inheritance of this character and the value of early estimates of the amount of skin folds for predicting this character in yearlings. The applications of the findings in sheep breeding are discussed.
Madsen, Milton A.; Esplin, Alma C.; and Phillips, Ralph W., "Bulletin No. 307 - Skin Folds in Sheep" (1943). UAES Bulletins. Paper 269.