These anti nutritive components are unpalatable and thus decrease feed intake. They also bind with some proteins and make them unavailable for digestion and absorption in the small intestine.
It is better to dilution technique which neutralize anti-nutritive component in plant. that means use more feed resources at a time, for example straw mixed with tree fodder can dilute tannin effect in ruminant animal. Removal from the plant need long time and there could be survival problems, many insect and pest can attack on plant
So the components in the feed that contain anti nutrients should be in low concentrations by diluting with other components with no anti nutrients?
there are many methods
1. keeping low level of inclusion of these ingredients with TMR
2. boiling in water
3. alkali treatment/chemical treatment
Chemical extraction of CT from feeds is not economical. I agree with the above statements in that CT intake (not necessarily % CT unless only consuming 1 ingredient) is the driving factor; thus, mix CT-containing feeds with non-CT containing feeds. Also, heat and/or steam and pelleting can bind "extractable CT," which can make the CT less bioavailable. Look up papers by Terrill, Muir, etc. or search for keywords (condensed tannins, heat, pelleting, serecia, analysis). Also, remember that numerous reports show that "some" CT is beneficial to the rumen & animal.
Condensed tannins may be beneficial to ruminant animals as they apparently protect protein from ruminal degradation and therefore providing a source of by protein. This is most useful if the protein being prtotected is of high biological value. On the other hand hydrolysable tannins have been found to be beneficial to pigs as they have been shown to improve feed efficiency due to their inhibition of caecal bacteria activity which in turn reduces gas production. HTs also have antioxidant properties. What is needed is to find the optimal inclusion rates of these tannins to take advantage of their beneficial effects in different animal species.
Biological treatment of feed reduces the anti-nutritional substances such as tannins and phytate while crude protein increases.
What are the methods you use for determining these anti nutritional factors?
I agree with Lawrence. Tannins are not 100% undesirable, Tannins act as a defence mechanism by the plant,that is how the plant adapts to the environment of being grazed/browsed. Intestinal digestion takes care of Rumen Undegradable Protein as well is the tannins that escaped rumen degradation. forages such as Leucaena spp are known to have a good amount of tannins and mimosine, so like other scholars suggest, such forages need to be used as part of a diet rather than sole feeding.
I would like to augment to contribution by Zibani and Lawrence. Nutritionist should not underestimate the the health-enhancing properties that are induced by tannin-rich diets such as anti-helmintic, antioxidant, antidiarrheic and anticancerogenic effects (Funatogawa et al., 2004; Min and Hart, 2003; Geidarn et al., 2007). Moderate tannins in the diets can indirectly act as alternatives for banned growth promoters. Leaf meals from plant species such as Acacia are common around in Southern Africa where Sipho Mabusela is. Therefore, the use of leaf meals may reduce the proportion of conventional protein sources in diets at the same time suppressing the need for banned growth promoters. However, it is of paramount importance to include them at optimum inclusion levels that permit potential performance. Nutritionist should note that high inclusion levels beyond optimum inevitably impose undesirable effects on performance and can sometime lead to death especially in monogastrics.
Doesnt the boiling of some feeds denature proteins? As much as the feed will be easier to digest but wont the nutritive value of the feed be tainted?
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