The minimum requirement for grazing stock is 4 animal units.  A grazing livestock animal unit equals; 1 mature cow; 2 five-hundred pound calves; 6 sheep; 7 goats, or 1 mature horse. If you only had cows, you would need a total of 4 mature ones.  If you only had goats, you would need twenty-eight.   A combination such as 2 cows, and 12 sheep would be four animal units.  Another example is 1 cow, 2 calves, 6 sheep and 7 goats which would be equal to the required number of 4 animal units. Please review the TCAD Guidelines for the Appraisal of Open-Space Land for additional information.