家蚕止桑、饷食时间的研究 Ⅱ.家蚕止桑、饷食时间与生长发育和代谢的关系

探讨了小蚕期止桑、饷食时间与大蚕期生长发育和代谢的关系,发现一至三眠迟饷食12小时,一至二眠或一至三眠早止桑60％,迟饷食24小时处理区的四至五龄食下量和消化量减少,五龄指数生长期缩短,体重减轻,处理结束龄和五龄中肠组织碱性磷酸酶、五龄肠液蛋白酶、五龄后部丝腺谷丙转氨酶活力降低、而一至三眠早止桑60％,一至二眠迟饷食12小时,对上述性状无明显作用,消化率和食物转化率不受止桑、偏食时间的影响。认为起蚕期长时间饥饿会损伤中肠机能,使蚕陷于营养不良,生长机能减弱,丝蛋白合成能力下降,表现出经济性状和抗病性的降低。

Study on the time of last and first feeding of silkworm, Bombyx mori.II.Relation with the development and metabolism

Effect of delaying first feeding ( DFF for short ) and moving up abstinence of feeding (MAF for short) of younger silkworm, Bombyx mori, on the development and metobolism of older larvae has been researched. As a result of DFF 12 hr of 1-3rd molt,MAF 60%-DFF 24 hr of 1-2nd or l-3rd molt, the amount of ingestion and digestion and body weight of older larvae was decreased markedly, activity of alkaline phosphatase, protease of gastric juice and glutamic-pyruvic transaminase of posterior silkgland of 5 instar larvae lowered, whereas MAF60% of l-3rd molt and DFF 12 hr of l-2nd molt showed few influence on these characters. It is very likely that long starvation of molted larvae will lead to hypofunction of digestive organ and then dystrophy, hence, reducing silkworm economical characters and resistance to virus.