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scmn | Perhaps consider adding grain. A ton of silage contains approx 8 bu of grain. Thus you will need approx 5# of silage to increase grain in ration 1#. The issue with silage is they fill up before the energy needs are met. IMO a 5 gallon bucket of shell corn or DDG (25-30#) morning and night would have been more beneficial than the extra silage. If they lost weight they were not able to consume enough volume to satisfy their energy needs.
Here is an article from UNL. Granted it is for beef cows, the situation is similar to bred heifers.
https://beef.unl.edu/energy-requirements-change-in-cold-weather
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Free choice grain?
