The loss rate increase gradually. Water loss rate of silkworm eggs decreases abruptly by 3%-5% in the Ji3 stage.

• 催青至己3、己4期，失水率呈突然下降的趋势，下降了3%25-5%25，说明胚胎发育中己3至己4期保持低水分散失可能是胚胎发育正常的生理要求。