long-staple wool. Hand-spun wool from these animals was the main source of yarn for Navajo blankets until the 1860s, when the United States government forced the Navajo people to relocate at Bosque Redondo and seized their livestock. Before their removal, the early weaving practice was such that unprocessed wool was chiefly used to make blankets and which still retained its lanolin and suint (sweat), and which could repel water, on the one hand, but which left an unpleasant odor to the finished woolen product, on the other. The 1869 peace treaty that allowed the Navajo to return to their traditional lands included a $30,000 settlement to replace their livestock. The tribe purchased 14,000 sheep and 1,000 goats. Between 1870–1900, commercially processed, pre-dyed woolen goods were introduced to the Navajo, which they incorporated in their weaving. Mid-19th century Navajo rugs often used a three-ply yarn called Saxony, which refers to high-quality, naturally dyed, silky yarns. Red tones in Navajo rugs of this period come either from Saxony or from a raveled cloth known in Spanish as bayeta, which was a woolen manufactured in England. With the arrival of the railroad in the early 1880s, another machine-produced yarn came into use in Navajo weaving: four-ply aniline dyed yarn known as Germantown because the yarn was manufactured in Pennsylvania. Among the locally produced yarns for Navajo textile, indiscriminate breeding from 1870-1890 caused a steady decline in wool quality. Increasing proportions of brittle kemp can be found in well-preserved examples from the period. In 1903, federal agents attempted to address the problem by introducing Rambouillet rams into the breeding population. The Rambouillet is a French breed that produces good meat and heavy, fine-wool fleeces. The Rambouillet stock were well adapted to the Southwestern climate, but their wool was less suitable to hand spinning. Short-stapled Rambouillet wool has a tight crimp, which makes hand spinning difficult. The higher lanolin content of its wool necessitated significantly more scouring with scarce water before it could be dyed effectively. From 1920 to 1940, when Rambouillet bloodlines dominated the tribe's stock, Navajo rugs have a characteristically curly wool and sometimes a knotted or lumpy appearance. In 1935, the United States Department of the Interior created the Southwestern Range and Sheep Breeding Laboratory to address the problems Rambouillet stock had caused for the Navajo economy. Located at Fort Wingate, New Mexico, the program's aim was to develop a new sheep