Kerwin, Decided to measure the flow rate. I have 150+ ft of 3/4 black plastic pipe from my basement to hydrant at pole barn. I have 75 ft of 3/4 hose connected to hydrant, 225 + ft of 3/4 inch line. Turned water on for a minute before I started measuring flow rate, that way pressure would be less and pump would be running. If your cows can drink more than 10 gallons per minute, you may need to go with the larger pipe.
My well is new. It has a 1/2 hp gould submersible. There is about 50 ft of 1 inch pipe from well to house and my water table is 30 ft below grade. My well guy says pump should deliver 12 gallons per minute. Never measured the flow rate at well head. It is for sure more than 10 gallons per minute.
Hope this helps you decide what you are going to do. I can't see putting a pant load of money in larger pipe, especially is you have a small pump, your flow rate is small and your cows can wait for a drink.
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