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This change will result in lower protein requirements in the concentrate portion of your ration and a need for increased energy be it in the form of a starchy feed like high moisture or ground corn or from another source like bakery meal.
Another option that is very useful for replacing some corn silage in the ration is beet pulp. Many producers are already feeding this product, so it may be something as simple as working with your nutrition professional to determine if you can increase the feeding rate of the beet pulp in order to further reduce the amount of corn silage you are feeding. If beet pulp is not currently on farm, it can be purchased in either wet form (75% moisture) and stored in a bag or bunk like silage or it can be purchased in a dry pelleted form either in bags or bulk. The wet product generally becomes available in late August as beet harvest and processing begins.
Brewers grains, cotton seed, and distillers grains are some other commodities that are generally available in Eastern Canada and can supplement a ration as well as help to replace some of the energy portion of corn silage. Many of these are high in concentrates and do not help to replace the fibre portion of the corn silage. This can be done by increasing haylage, adding straw to the ration, or adding in a non-forage fibre source in conjunction like oat hulls, ground corn cobs, or soy hulls.