標(biāo)題: enzymes in feed [打印本頁(yè)] 作者: monica 時(shí)間: 2009-11-1 17:08 標(biāo)題: enzymes in feed Farm animals, mostly monogastrics, have been fed with commercial feeds for a long time and cannot define their own diet from ingredients found in nature anymore. Numerous ingredients (cereals, animal and vegetable protein, fiber, etc.) cannot be digested and absorbed efficiently enough to sustain optimal growth and performance in animal production.
Adding exogenous enzymes to feeds will improve the digestibility of a number of nutrients in the diet, as a function of the specificity of the enzyme towards the substrate in the feed. A few examples of that; a phytase will improve the availability of plant phosphorus, a protease will increase the solubility and the digestibility of protein, a fibrolytic enzyme will increase the energy value of certain cereals, etc. One has to understand that each enzyme is active only on its own specific substrate, like a key opening only one lock.
Protease enzyme is perfectly indicated in corn or sorghum based formulas using multiple protein ingredients and in aquaculture feeds with high protein content and multiple protein sources.
There are many so-called « fibrolytic enzymes » that can free the energy in the « non starch polysaccharide (NSP) » fraction of specific cereals and their affinity is determined by the type of enzyme and the nature of the substrate.
Research on enzymes in animal nutrition has always targeted the energy fraction of feeds, very seldom the protein components, but this is changing!作者: xqlzql 時(shí)間: 2009-11-2 08:14
不錯(cuò)的書呀，A few examples of that,其實(shí)酶制劑在飼料中的應(yīng)用已經(jīng)研究很多了，加拿大還轉(zhuǎn)基因成功了含植酸酶基因的豬。應(yīng)用前景很廣。作者: 孟俊英 時(shí)間: 2009-11-2 17:59
至于人們對(duì)NSP酶、纖維素酶、果膠酶、淀粉酶等的興趣遠(yuǎn)遠(yuǎn)超過(guò)對(duì)堿性蛋白酶或酸性蛋白酶的興趣的原因，是因?yàn)槟芰渴莿?dòng)物的第一需要，“為能而食”，能量飼料才是飼料中最主要的部分。作者: zhhong5577 時(shí)間: 2009-11-28 19:18
Great information, there are so many different types enzymes we don't know about, and we got to be carefully about selecting right enzyme for the right usage.