Study On Preparation And Effect Of Composite Feed Additive Of Medicine-Ginkgo Leaves

This paper prepared composite feed additive of medicine-ginkgo leaves fermented by Candida utilis, and its culture conditions were optimized. The study was conducted to determine the effect of dietary supplementation with composite feed additive of astragalus-ginkgo leaves on broilers. The results were shown as follows:1. In this study, solid-state fermentation was employed to prepare composite feed additive of medicine-ginkgo leaves. The best combination for medicine-ginkgo leaves was astragalus and ginkgo leaves with the ratio of 1:4; if sucrose was used as carbon source, 2.47%~3% was added; if ammonium sulfate was used as nitrogen source, 3.29%~4 % was added. The vaccination was 10%~7.43%. The optiminal culture conditions were initial moisture content 65%, initial pH value 5.5, incubation temperature 28~30℃, and incubation time 48~60h.2. The results showed that the content of flavone from the fermented products was reduced slightly. However, the number of yeast cells amounted to 2.65×109 pergram and the contents of astragalus polysaccharide, crude protein and total amino acids were increased by 111.5%, 70.02%, and 20.92%, respectively.3. In the laboratory, under optimal conditions for the preparation of composite feed additive of astragalus-ginkgo leaves was brown, soft, delicate texture and had a unique scent of astragalus.4. The results from feeding broilers indicated that: the growth performance and antioxidant function increased at 0.1% or 0.2% level, and these two levels promoted the growth of broilers immune organs adding 0.2% Composite feed additives of astragalus-ginkgo leaves improved carcass response and the nutritional content of broilers, and significantly decreased cholesterol and blood urea nitrogen in broilers'serum.5. The results of the economic evaluation showed that: adding 0.1% and 0.2% of Composite feed additive of astragalus-ginkgo leaves can get profit of 1.76 yuan and 1.51 yuan, respectively. The practical application of the feed additive was very substantial and can be used for generalization.