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...Publication nutrition and feeding of the cow calf herd essential nutrients feed classification nutrient content feeds john b hall extension animal scientist virginia tech william w seay agent science scott m baker are that needed by all living things these must either be fed or made animals from building blocks obtained through eating drinking breathing water is most for life cattle can live many days a few weeks without food but will die within needs to fresh clean plentiful ensure maximum intake temperature does not seem affect very much research indicates readily drink f energy vary with environmental dryness fuel bodily processes breath cows lush grass on cool spring ing walking growth lactation repro day less than grazing duction starches sugars fats sources same field in middle summer hay maintenance used keep requirements given table alive losing gaining weight good rule thumb need gallon every giving milk cold weather mud increased lbs body larger size increase main total daily...