【摘要】 我们以鲜猪肝匀浆、蜂蜜和蔗糖以5:1:1混合而成的代饲料来饲养七星瓢虫(Coccinella septempunctata),代饲料的含水量在50％左右。这种代饲料加水稀释使含水量不同,用来饲养成虫,试验比较了代饲料含水量不同时对取食量、体重增加、产卵量、食物利用率和食物转化率的影响。结果表明当代饲料含水量增加到75％和85％时鲜代饲料的取食量比以未稀释的代饲料为食时增加一倍,特别在饲养试验开始的数天。所以代饲料中的水分似乎有助食作用。但以干重量计算时这种差异并不显著。以含水量较高的代饲料为食时体重增加百分率较高,但含水量为75％的比85％的好。羽化后取食含水量为75％代饲料的成虫其产卵率为60％,而取食含水量为50％和85％饲料的其产卵率为40％。平均产卵前期(N=20)以取食含水量85％的代饲料的成虫最短,约为16天;而取食含水量50％和85％的约为20天。代饲料含水量较高时食物利用率较高,但食物转化率却以取食含水量较低的代饲料较高。这种情况当饲养期延长到1个月时可发生逆转。更多还原

【Abstract】 The water content of the artificial diet composed of fresh porcine liver homogenate, honey and sucrose in the proportion of 5:1:1 by weight for the lady bird beetle Coeeinetta septempunctata is about 50%. It was adjusted to different levels by mixing water into the diet to test its influence on food intake, changes in body weight, fecundity, food utilization and food conversion of the adult beetles in the rearing experiment. Our results show that to raise the water content to 75% and 85% will double the quantity of fresh diet ingested as compared with the original diet, especially in the early days of the experiment. Therefore the water in the diet seems to have a phagostimiilating effect. But the difference is not conspicuous when the quantities of diets ingested are calculated into dry weights. Accordingly a higher percentage of body weight increase has been found in the beetles feeding on diets with higher water contents; but 75% is better than 85%, The rate of oviposition is 60% in the beetles feeding on the diet with 75% water after emergence while in beetles feeding on diets with 50% and 85% water it is 40%. The average duration of the pre-ovipositing period is shortest in the beetles feeding on the diet with 85% water, about 16 days while in beetles feeding on diets with 50% and 85% it is about 20 days. Food utilization seems to increase with higher water contents in the diets, but food consversion seems better in the beetles feeding on diets with lower water contents and the condition may reverse when the rearing is prolonged to about one month.更多还原