There are many things that depend on the amount of water a sheep needs to drink on a daily basis. This depends though on the size of the sheep. In the winter if there is snow, as long as it is not hard, sheep will eat enough of the snow to get all the water they will need. If the water is not clean there will be a decline in the production of sheep. This will cause them to eat less, have trouble digesting food properly, be more likely to get digetive and metabolic problems.
Energy is also the most expensive thing when raising sheep.
Energy is usually used for maintance or productive functions. The amount of energy sheep needs depends on the size of the sheep, the production stage they are in, the amount of exercise they get, and the temperature of the environment they are in. The larger the sheep the larger the amount of energy it will need. Sheep in smaller environments don t need as much energy as sheep in larger environments. The amount of protein sheep eat is more important than the quality of the protein.