엽산을 뽕잎에 각 농도별(100, 200 및 300$mu$g/ml)로 처리하여 4령 또는 5령 누에에 첨식시킨 결과 전견중, 견층중, 산란성 및 부화율과 같은 실용형질이 향상되었으며 대조구에 비해 경과일수도 통계적인 유의성 있게 단축되었다. 지방체의 glycogen과 단백질 함량의 증가는 유의성이 없었으나 체액중 trehalose는 모든 처리구에서 증가되었으며, 지방체와 체액중의 단백질 함량은 100$mu$g/ml구에서 유의적으로 높았다. 그러나 300$mu$g/ml구에서는 체액중 단백질 함량은 오히려 감소하였다.
Dietary supplementation of folic acid to silkworm larvae in different concentration (100, 200 and 300 ${mu}$g/ml) to the 4th and the 5th instar resulted in a significant increase in economic parameters, such as female and male cocoon weights, shell weights, egg productivity and egg hatching percentage. However, larval duration was significantly decreased, as compared with that of carrier control. The increase in the glycogen and protein contents of the fat body was not significant, whereas the increase in trehalose content of haemolymph in all the treated groups and protein content of fat body and haemolymph in 100 ${mu}$g/ml treated groups were significant. However, the haemolymph protein was significantly decreased in 300${mu}$g/ml treated group.
