Artificial odorants such as neatsfoot oil has been used to facilitate adoption of alien lambs by ewes bearing single natural offspring because the oil provides a common odor for the lambs. Use of cloth stockinette jackets to exchange natural odors between lambs has also aided this adoption. Both methods were tested on lambs within 12 hours of birth. On the day following birth, the jackets were exchanged between own and alien lambs, and the alien lambs were fostered. The incidence of acceptance and rejection behaviors of ewes was monitored using ten-minute acceptance tests. In 5 days, 85 % of the ewes had met the acceptance criteria of no butts or butt attempts directed at the alien lamb, and they allowed a sucking time of 20 seconds or more by the lamb in each of two successive daily acceptance tests. Thirsty-six percent of the ewes adopted the alien lambs immediately. The study indicated that alien lambs could be successfully fostered in Friesian x Targhee cross ewes with natural twin lambs using a combination of neatsfoot oil to establish a common odor between own and alien lambs, and cloth stockinette jackets to exchange natural odors between natural and alien lambs.