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饲料是发展水产养殖业的物质基础。鱼类维持生命,生长发育和繁殖都需要足够的能量和各种营养物质,而提供这些能量和营养物质的主要源泉就是饲料。从目前对水产养殖经济结构的分析来看,以池塘养鱼为例,物化成本约占总成本的80%,其中饲料成本约占70%左右,可见饲料的投入在支出中占有举足轻重的地位。 相似文献
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如何解决养鳖的饲料一直是养鳖户所关心的重要问题,对此,笔者根据养鳖户的经验进行总结,谈谈解决养鳖饲料的几种途径,介绍如下: 相似文献
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The yeast cell wall is recovered as a by-product during the
production of soluble extracts from brewer's yeast(Saccharomyces cerevisiae).It is made up
predominantry of glucan,mannan oligsaccharides,glucoprotein and chitin polymers.The glucan
is a homopolimer of glucose linked through β—(1→3)and β—(1→6) D glycosidic
bonds.The therapeutic effect of glucan has been primarily due to stimulation of
reticuloendothelial system(RES).Studies have demonnstrated the effect of glucan in
improving host resistancee by enhancing immunty to certain malingant tumors as well as to
certain bacterial and viral infections.MOS's acts in the gut of animal capturing hostile
gut-wall-attacking bacterla like E.Coli.Cell wall can be applied in all sorts feeds,but it
is especially recommended for weaning piglets and aquaculture feeds. 相似文献