Three overlapping silk worm rearing of Japanese F-1 hybrid race (SHUNRE X SHOGESTSU) were conducted under local conditions during the months of February - April, 1984. The cocooning ratio 94.67% and 94.89% and cocoon shell ratio 23% and 22.21% in respect of the first rearing during February 18 to March 19 and second rearing during March 3 to March 30 respectively were considered quite satisfactory. The same being 75% and 19.64% in respect of third rearing during, March 20 to April 17 were considered on low side.