The Research Of Compensatory Growth Of The Giant Sala Mander

It is easy for animals to suffer from hunger stress during life history of them. When the hunger stress disappears, the growth rate of them can be higher than animals that haven’t suffer from hunger stress. This phenomenon is called compensatory growth. Compensatory growth was found during some higher plant, it is physiological ecology adaptability get from constantly adapt to the environment during the long process evolution of many creatures.Chinese giant salamander is a kind of ancient amphibian that only distributed in China, which belongs to Amphibia, Caudata, Cryptobranchidae, Andria. The C hinese giant salamander is easy to suffer from hunger stress because they have poor predation ability. The Chinese giant salamander has strong ability to endure hunger, if use the regular of compensatory growth reasonablely, the cycle of farmed giant salamander can be shorten, the growth performance can be improved, the nutrition proportion can be controlled, and the economic benefits can be improved.The influence of refeeding after different length of time hunger to the compensatory growth of 18 months old C hinese giant salamander and the influence of different feeding frequency to the compensatory growth of 18 months old C hinese giant salamander were studied by contrasted and analyzed the growth indicators, body composition and digestive enzyme activity under the condition of intensive aquaculture, the physiological mechanism of it was explored as well. Measured the body length and weight at the beginning of the experiment and the end of the experiment, compared and analyzed the WGR, SGR, AFR, FCR, FCE, CF, body composition, digestive activity of the C hinese giant salamander. The C hinese giant salamanders were fed in pools indoor, where we could control the temperature and the wall of the pools were smooth. The results showed that: In the first test, when the length of break feed ing time was 2 days, 4 days, 6 days and 8 days, the digestive enzyme activity increased, the AFR, FCE, WGR, SGR increased, and the FCR decreased, performance for Over-compensatory growth. When the length of break feeding time was 10 days, performance for Completely compensatory growth. In the second test, the AFR and the digestive enzyme activity of the Chinese giant salamanders from experimental groups were increased, when the feeding frequency was S6F6, the SGR and the WGR showed the maximum, significantly higher than other groups(P<0.05), and the FCR showed the minimum. When the feeding frequency was S2F2, the protein content was high and the fat content was low. The survival rates were lower than other groups when feeding frequency were S6F6 and S8F8. If strict ly wanted high level of survival rate and body nutrients, S2F2 was the suitable feeding frequency. If not, when the feeding frequency was interval 6 days and then fed 6 days, the survival rate, growth performance and body nutrients achieved a high level and it was the suitable feeding frequency of juvenile salamander. In the experimental groupss of the two tests, the actual feeding rates were higher and the digestive enzyme activity were stronger than the control groups, so the compensatory growth of C hinese giant salamander was the result of enhance feeding ability as well as improve digestion metabolism.