How do I roast raw soybeans for feed? - Page 2

You do not want to destroy the Trypsin, what you are doing is killing the Trypsin Inhibitors by either roasting or boiling.

Trypsin -
A digestive enzyme that breaks down proteins in the small intestine.

Trypsin inhibitor -
Trypsin Inhibitors are chemicals that reduce the availability of trypsin, an enzyme essential to nutrition of many animals, including humans.

Chris

Ok, so the website I quoted from must have erred in naming the toxin in dried beans. My fault entirely. I should have done more research. But there is a toxin to birds in uncooked beans, and I am just trying to convey the importance of thorough cooking/heating of any type of bean prior to feeding to your chickens. 

I apologize for my error.

I would also like to clarify that just because a plant is listed as "toxic" doesn't always necessarily mean that it is fatal. "Toxic" may mean causing an unwanted or unhealthy response, such as cramping or diarrhea. But being aware of, and trying to avoid certain plants/foods, should help in keeping your chickens/birds happy and healthy.

Below I have some links to foods/plants that are considered toxic to birds. The second one is extremely extensive and lists a lot of plants that I would not have considered toxic, but again, not all toxins are fatal.
The last link is to a site that lists plants that are toxic to humans, small animals and birds. It also lists non-toxic plants. Beans, however, are not mentioned at all.

Top 10 Common Foods that Can Poison Your Bird

http://birds.about.com/od/feeding/tp/poisonousfoods.html

10. Dried Beans
Cooked beans are a favorite treat of many birds, but raw, dry bean mixes can be extremely harmful to your pet. Uncooked beans contain a poison which is very toxic to birds. To avoid exposure, make sure to thoroughly cook any beans that you choose to share with your bird.

A list of toxic plants at PoultryHelp.com

http://www.poultryhelp.com/toxicplants.html

SOYBEAN (Glycine max); may contain toxic levels of nitrates; plant is goitrogenic.

The Toxicity of Plants

http://www.busybirds.net/Toxic.html#anchor_19

You need to be careful when you throw around the term "toxic" in relation to legume seeds.  The Trypsin Inhibitor found in raw soybeans and other legumes is not Toxic in the poisonous sense.  The Trypsin Inhibitor prevents the enzyme named Trypsin from working ont he peptide bonds found in proteins.  When the Trypsin is not allowed to work, the long polypeptides are not digested into the amino acids, di-, and tri-peptides which can be trasnported across the brush border membrane.

Jim