Soybeans have a high protein value, but they contain anti-nutritional factors (ANFs), such as trypsin inhibitors. Without treatment, this inhibitor reduces the animal's digestibility of the protein.
In the tool, varieties with a lower ANF-content are found. They are tested in a dairy cow production trial. The low ANF-soybeans have the same effect as the treated ones.
Two rations with different soybean varieties were tested on dairy cows to see whether a soybean low in anti-nutritional factors could be used without treatment. By choosing the right genetic soybean variety, it is possible to achieve a higher protein digestibility without treatments. There are different soybean varieties , some with only half the ANF content. This way, it is possible to harvest soybeans directly at the farm and feed them to the animals.
These varieties contain 25 mg antitrypsin per g flour compared to commercial varieties which contain 50 to 55 mg.
The varieties low in antitrypsin were used to feed a group of dairy cows while the conventional variety was fed to another. Production and fertility values as well as milk quality remained the same; this means that this low-ANF-soybean variety does not decrease digestibility of protein even though it is untreated.
Without the treatment, it is possible to use the soybeans directly on the farm.
This tool can be useful for organic and conventional farmers.