Nutritive value of fermented soybean grains for ruminants

Area of Science:

• Animal Nutrition
• Feed Science
• Agricultural Chemistry

Background:

• Fermented soybean grain (FSBG) is often deemed unsuitable for animal feed due to presumed compositional changes and mycotoxin risks.
• Existing data on chemical composition does not fully support these concerns, and in vivo studies are lacking.

Purpose of the Study:

• To investigate the effects of using fermented soybean grain (FSBG) as a protein source in feedlot lamb diets.
• To evaluate the nutritional value and animal performance when FSBG replaces standard soybean grain (SSBG).

Main Methods:

• Two types of FSBG (partially and completely fermented) and SSBG were analyzed for chemical composition.
• In vitro dry matter digestibility (IVDMD) and rumen degradability were assessed.
• Feedlot lambs were fed diets with FSBG totally replacing SSBG (17.4% of dry matter) to evaluate nutrient intake, digestibility, and performance.

Main Results:

• Completely fermented soybean grain (CFSBG) had lower dry matter and carbohydrate content but higher crude protein, fiber, and indigestible NDF than SSBG.
• FSBG exhibited lower in vitro dry matter digestibility (IVDMD) and rumen-degradable protein compared to SSBG when evaluated separately.
• However, when incorporated into diets, FSBG substitution did not affect overall IVDMD, nutrient intake, apparent digestibility, or lamb performance (average daily gain, carcass gain).

Conclusions:

• Mycotoxin-free fermented soybean grain (FSBG) is a viable alternative protein source for feedlot lamb diets.
• FSBG can completely replace standard soybean grain (SSBG) without compromising animal performance or nutrient utilization.