| It is effective method to shorten the growth cycle and improve growth rate by transferring exogenous growth hormone gene. Since the first transgenic fish successfully researched, people great concern the reseach of the growth, immunity, disease resistance of the fish transferred exogenous gene. And in the animal breeding and genetics, weight is the most direct target trait and the directly reflection of the production performance of fish. the relationship between morphometrics and body weight can be clarified by path analysis, and we can breeding through morphometrics. In path analysis, variables and dependent variables of simple correlation coefficient are decomposed into direct and indirect influence.In order to study competition for existence and Gonad development of transgenic carps transferred salmon growth hormone gene in semi-starvation condition, the transgenic carps and common carps were devided into two groups, every group had the same original gross weight, were cultured in the same big pond and sampled simultaneously every month. But one group fed plenteous food while another was short of food. after sampled in three consecutive month, body weight- body length equation was fitted and we used morphological and histological method transgenic carp carp and control, feed possession and gonadal development progress. Then next year, in order to confirm the main phenotypic factor that will affect the estimation of body weight, We selected 30 individuals of transgenic carp at the age of two years old randomly from the group fed plenteous food with 30 individuals of normal carp as positive control by correlation analysis and path analysis, these phenotypic factors are total length, standard length, body height, least height of caudal peduncle, length of caudal peduncle, length of head, snout length, horizontal diameter of eye, interorbital distance, body depth and body weight.1. Comparison of relative weight growth-rate and gonadal development situation of transgenic carps and the controlThe results showed that the rate of weight growth of transgenic carp and controlled carp in plenteous feeding groups were respectively 127.9% and 70.6%; while the rate of weight growth in poor food condition is respectively 72.3% and 52.2%.it indicated transgenic carp have rapid growth advantage whether in plenteous or short of food groups; By comparing the filling of two groups, it was not different with transgenic carp and control in plenteous food group (P>0.05), it was also not different in semi-starvation group (P>0.05), but the ratio of intestinal length/body length of transgenic carp is greater than the control and it was differences with transgenic carp and control (P<0.05),it Indicated that the transgenic carp may have stronger digestion; Overall, it was not different from the gonadal development process of two groups (P>0.05), However, it was different from the relative male and female gonad weight of transgenic carp and control in some months (P<0.05), the transgenic carp gonads develop better than the control, whether in plenteous or f short of food groups.2. Analysis of morphometrics and body weight in the transgenic carps by correlation and pathCorrelation analysis results showed that most of phenotypic traits were significantly related to body weight for both of the two kinds of carp through the calculation of correlation coefficients (P<0.01). For the transgenic carp, path analysis indicated that body length and body height were the main predictable factors and affected body weight directly with their path coefficients of body length and body height 0.572 and 0.415, respectively. While, for the normal carp, body depth and tail length were the main predictable factors and affected body weight directly as shown by 0.610 and 0.377 of the path coefficients respectively. |
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