Agricultural materials used in feed production contain a lot of polymers which ordinarily cannot be digested by enzymes in the intestine. By the process of fermentation the complex polymers will be broken down by enzymes produced by the fermenting organisms ,to simpler unit that can be digested. This increases the bioavailability of the components. Therefore I believe that fermentation increases the biological availability.

Dear chika,

Thank you so much for your explanation, anyway, do you have some journals regarding on the feed fermentation, especially from plant/forage might increase the biological availability? thank you

I can point you in the direction of many papers on feeding fermented liquid feed to pigs and fermented moist feed to chickens.  In these species fermentation can significantly improve digestibility of protein, CHO and minerals (particularly those that are normally bound to phytate).  As far as I am aware (and can find from searching my database) there has been no comparable work on feeding the rabbit.  I would not expect fermented feed to benefit the rabbit in the same way as soft pellets allow fermentation by lower gut flora when re-ingested.  However, there may be benefit from fermenting specific raw materials that are subsequently incorporated into dry diet (there are some references to this using rabbit for model of atherosclerosis and cholesterol control.

thank you all, any information and oppinion from another scientist, please :) thank you in advance....

many regards

thank you so much :) regards

Dear Sulhattin Yasar,

well sir, I will do a mechanical process animal feed with plants - e.g milk thistle (silybum marianum) as a feed supplement for fattening rabbits. we would like to know the effect between fermented milk thistle as a feed and non fermented feed. do they have the same effects of performance and health status of rabbit or not, and it is also we would like to analize the duration or let say the length of fermentation, is the timing for fermentation is influence in order to increase the bioavailability of not. do you have any idea or information, thank you in advance.

Dear Mr Sulhattin Yasar,

thank you very much indeed for your great informations :)

see you around,

Best regards - cheers :) 

Akhir.