Despite these setbacks in the production area ,JT had made progress on the technical front.Its sericulture operation had succeeded in producing several highly resistant crossbreeds of Chineses white and Thai yellow silkworm species.In addition,its extension activities had helped contract farmers improve production yields,and the average amount of fresh cocoons produced per box of silkworm eggs increased from 23 kilograms in 1992 to 27 kilograms in 1993