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Ewe nutrition should be maintained at a high level for at least the first month of gestation to safeguard safe attachment of the embryo(s) to the wall of the uterus.
After this, maintenance feeding of ewes will suffice and actually lead to benefits in optimal development of the placenta.
In terms of energy, a 70kg ewe in mid-pregnancy will require 0.8UFL to meet maintenance demands. To put this in context, access to a good supply of moderate quality grass will meet these demands, as will silage ranging in quality from 67 DMD to 70 DMD with a dry matter intake of 1kg DM to 1.1kg DM.
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