I studied animal science in college.There is none and that is the point. There is nothing scientific to support the value of "fermented feed".
Fermented seems to be just an inoffensive name for sour.
I have asked poultry nutritionists (PHD and DVM type) about this practice and I assure you that they are astounded at the idea that anyone would do this to chickens.
They have cited fears about leeching of nutrients, potential introduction of harmful yeasts and acids into the initial parts of the digestive system (especially the crop) and providing an environment conducive to growth of harmful pathogens. Those pathogens of concern include these that I found cited in Wikipedia-
Some examples of facultatively anaerobic bacteria are Staphylococcus spp., Escherichia coli, Shewanella oneidensis, and Listeria spp. Certain eukaryotes are also facultative anaerobes, including fungi such as yeasts. . .
Staph, e. coli, listeria - scares me ! !
I feed my chickens PICKLED feed. THat is what it is. THis was also fed to the dairy cows as silage. We often eat it as sour kraut. Carefully innoculated fermentation. NOT spoiled feed. I actaully have my fermented feed last longer as it does not spoil when it get wet.
As for the growth issues, these cornish crosses grow so fast that the protein needs to be very high and the whole formulation of the grain is important to support balanced growth betweent he muschles and bones and tendons. Please have a look at the hatchery web sites as a few do post the protein levels appropriate for these chicks.
I fed 22% fermented feed to mine and had no leg problems.
Good luck. Interesting project!!
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