The meat on a carcase is only 50% of the liveweight, therefore you have to look at the liveweight.
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Rough figures: Cattle are made up of about 80% water and they would drink between 10-40 gallons a day as an adult depending on temperature and feed. Grain fed would probably ingest at the higher range. Steers are killed somewhere between 1 and 2 years old cows at around 6 years.