Brewers spent grains, fresh, ensile or dried
Fresh, ensiled or dried
brewer's grains are plant by-product of the beer production and processing of barley into malt. Much fresh grains available in the spring and summer. Fresh grains will keep for a few days and can only relate to farms nearby brewery. Wet spent grain can be ensiled. By working carefully, it is possible to keep several months. All types of silos are adequate. As the product is wet and fermented, it is necessary that the silo has a flow. Mixed with dried pulp or corn, the juice of formation is less. The grains can also be purchased dehydrated but its price is much less advantageous.
Rules for proper conservation of grains: be more stringent than for other silages!
Fill the silo at once. Provide flow to the juice. Do not use too broad and tall silos. Work quickly and without interruption. Cover the grains hermetically (plastic film). Pack uniformly but not excessively so as to eliminate air pockets between the job and the tarp. Leave the grains ferment for 3 weeks. They naturally acidify (pH <4.5) In the case of prolonged use (6 months), use a preservative for silage. Dessiler daily very cleanly without unpacking the silo.
An additional source of protein
At the protein level, the grains are comparable to corn gluten (250 to 300 g MAT / kg DM), sometimes of varying quality according breweries. The low and slow degradability of the protein in the rumen makes an ideal combination with corn based diets. For dairy cows, it recommends 5 to 8 kg of grains (fresh or ensiled) per cow per day. For fattening cattle, the recommendations are 1 to 1.5 kg per 100 kg live weight. In association with corn, grains lend themselves well mixed ration with a bowl or trailer. The various tests show a positive effect on milk production.
economic impacts based on market prices
The opportunity to purchase price of grains must be reasoned in comparison to soybean meal and its protein. We must focus the bulk purchasing and off-peak periods (spring-summer). Add the costs of preservation (tarpaulin Conservative +/-) and do not underestimate losses silo (5-10%). Assuming that 6 kg of wet spent grain worth a kilo of soybean meal to 500 euros per tonne, the desirability of grains price is 83 euros. If there are 10% loss and storage costs, it is close to 75 euros per tonne. Below this purchase price is competitive spent grains.