Results: The high,middle and low PSP dose can prolong the silkworms' life span of larva-period,female chrysalis-period and female moth-period to different extent,can lighten the weight of larva silkworm,strengthen the resistivity of starvation of five-age larva silkworm. The effect of PSP is the same as vitamine E.
They were feeded 3 times during the 4th life stage and 6 times during 5th life stage. The growth statural of silkworms and the time of anti-starve were observed and recorded.
4. In the situation of lack of prey, the average survival time of E. balteatus larvae, whose growth stages are 0 h, 24 h, 48 h and 72 h, are 1.53 d, 2.48 d, 3.06 d and 3.75 d respectively.
In the experiment, 100 Neijiang pigs were provided for testing the resistance against the poor conditions with Landrace pigs as the main control. The results obtained in the test were as follows:
Lethal time of starved common carp ( Cyprinus carpio ), silver carp ( Hypophthalmichthys molitrix ), bighead carp ( Aristichthys nobilis ) and grass carp ( Ctenopharyngodon idella ) fry and fingerlings was determined and histological and ultra-structural changes of their skins and digestive tracts were observed when these animals were starved to death. At 18. 0-23. 0 C , lethal time by stravation was 7. 3-12. 0 days for the fry and 15-271 days for the fingerlings. For the fry, the ability of resistance to s...
Xinjiang camel was a kind of important transport tools in ancient times. There are six- teen thousand camels at hand now. Except its endurance of draught, its meat tastes delicious and its hump is a sort of precious delicacy. Camel hair is excellent material for weaving industry. It has nu- meral autocharacteristics, namely, the red blood cell(RBC) is ellipic and nucleated; the number of RBC is high; endurance of thirst and starvation ; endurance of extreme change of weather; endurance of wind and dust a...