Evaluation Of Performance-to-price Ratio Of Silkworm Treated By Different Methods And The Effect On Growth Of Crucian Carp

In our experiment, we use the oxidized and non-oxidized semi-pellet silkworm to replace imported fish meal in feed for crucian carps. The result proves that, through our concept in feed formulation by using fresh non-oxidized semi-pellet silkworm plus soybean meal, for purpose of improving fat and protein levels in feed with the same effect as the imported fish meal,20-50% fish meal can be replaced. Meanwhile, our experiment shows that it can bring about the side-effect by using oxidized silkworm in feed for crucian carps, therefore, the oxidized silkworm can not be used in feed. With the combinatinon of the results from our experiment and as for the characteristics of easy oxidization and deterioration of silkworms, the author puts forward the detailed methods in resolving the issue and evaluates the performance-to-price ratio between semi-pellet silkworm and imported fish meal, and summarizes a formula for evaluation. The performance-to-price ratio between fresh semi-pellet silkworm and imported fish meal is 80 to 100, there exists inhomogeneous relationship between the increase of acid value and the decrease of performance-to-price ratio, nevertheless, it is a plummeting process. And the relevant indexes of evaluation are summarized and used as the guidance for value-added raw materials procurement.The result from the experiment proves that:(1) For Experiment 1, we replace 90KG/T and 120 KG/T fishmeal separately of formular 1-D1 (fishmeal level at 150 KG/T in formular of Control Group) in the Control Group with oxidized semi-pellet silkworm. Although the levels of soybean meal and fat are improved, there exist striking differences (P<0.05) between each Experiment Group and Control Group in growth performance and economic benefits. It proves that oxidized semi-pellet silkworm has some negative effect on the growth of crucian carp.(2) For Experiment 2, we replace 90 KG/T fishmeal of formular 2-D1 (fishmeal level at 150 KG/T in formular of Control Group) in the Control Group with fresh semi-pellet silkworm while increasing the levels of both soybean meal and fat. There is no striking differences (P>0.05) between Experiment Group 2-S1 and Control Group 2-D1 in growth performance, survival rate, daily weight gain and FCR.(3) For Experiment 2, we replace 120 KG/T fishmeal of formular 2-D1 in the Control Group with fresh semi-pellet silkworm while increasing the levels of both soybean meal and fat. There exixt striking differences (P<0.05) between Experiment Group 2-S2 and Control Group 2-D1 in growth performance, survival rate, daily weight gain and FCR.(4) Comparing the experiment results of 2-S2 and 2-S1, there exist striking differences in growth performance, daily weight gain and FCR. It proves that it could lead to the decrease of growth performance of crucian carp to replace imported fishmeal directly with fresh semi-pellet silkworm. Therefore, we summarize the equation of evaluating the performance-to-price ratio of fresh semi-pellet silkworm as follows:Y=[(X1+X2)/2]×B1×B2+C, and we have obtained the calculated index of performance-to-price ratio at 80:100 for fresh semi-pellet silkworm to imported fish meal.(5)The acid value of freshness exerts greater influence on performance-to-price ratio of semi-pellet silkworm. When the acid value is less than or equal to 15Mg/100g, it can be used in feed for crucian carp. We summarized the acid value of semi-pellet silkworm from 10 to 15 Mg/100g, with the performance-to-price ratio at (80～50):100 between semi-pellet silkworm and imported fishmeal.