Rodriguez L and Preston T R 1999: Observations on scavenging Local (indigenous) and Tam Hoang (exotic) chickens given free access (when confined at night) to duckweed (Lemnaceae) offered alone or mixed with rice bran. Livestock Research for Rural Development. Volume 11, Article #11. Retrieved , from http://www.lrrd.org/lrrd11/1/lyl111.htm