In a small bowl add ½ cup of warm water (approx. 85° F) and a pinch of sugar. Allow to sit for 5-10 minutes until it becomes foamy.
Sprinkle 4 ½ tsp of yeast into the bowl and then stir the yeast into the water.
Set this aside to activate while you prepare the other ingredients.
In a large microwave safe bowl combine the 4 cups of milk and 2 ½ tsps. of butter. Warm in the microwave until butter is just melted. The milk/butter mixture should be warm but not hot.
To a mixer add 1 ½ Tb salt.
Add ½ cup of sugar.
Add warmed milk and butter.
Add the water and yeast mixture.
Using the dough hook attachment, combine these ingredients for a few seconds.
With mixer on low, start adding the 1300 g. of flour one cup at a time.
Once all of the flour has been added, leave the mixer on a medium/low speed for 8-10 minutes to work the dough.