A frustrating harvest season this fall means many acres of crops in the province still need to be combined. Barry Yaremcio, beef and forage specialist at the Alberta Ag-Info Centre, looks at using high moisture barley if cattle are in need of grain supplementation this winter.
Yaremcio says that harvesting the barley crop at 25 per cent moisture or higher and storing it in a grain bag or silage pit will result in the barley fermenting no differently than a whole plant cereal silage. “To have a high quality, palatable finished product, packing the grain to exclude air, or oxygen, is key.”
“If using a bag,” says Yaremcio, “The brake on the bagging unit needs to be engaged sufficiently to really pack the grain well. When the bag is being filled, the height of the bag should be constant without ‘hills and valleys’ which is caused by the machine rolling too far at one time. There is more air in the bag when the height is uneven, and that can cause problems during fermentation. If filling a silage pit, pack the grain with a tractor no differently than a crop of cereal silage. Cover with plastic and seal the pit as within three to four hours, if possible."
Yaremcio explains why high moisture barley can help to improve animal performance. “Higher moisture barley kernels are swollen due to the moisture, so the pericarp - or hull on the outside of the kernel - is not held as tightly to the seed as when the grain is dry. Rumen microbes and bacteria have an easier time breaking down the kernel, and digestive efficiency is increased, by eight to 10 per cent. Some research states that the higher digestive efficiency eliminates the need to roll or process the grain before feeding. Average daily gains for growing or finishing animals is also improved by approximately eight per cent. If the barley is to be rolled, it should be done before the grain goes into the bag or pit. Rolling frozen high moisture grain can result in more shattering which increases the amount of fines in the ration.”
However, the higher digestive efficiency can create a few problems. Says Yaremcio, “With a more complete and rapid fermentation, the starch in the grain is more readily available. It can produce digestive upsets such as acidosis or bloat. If high levels of grain are fed in a straw-grain ration for pregnant cows, increase the grain content gradually to prevent this problem. If the ration starts off with approximately six pounds of grain per day, increase the grain portion one pound every second day. This increase allows the rumen bacteria to adjust to the change which prevents problems.”