SHORT VERSION: I think...and we really shouldn't give too much credence to that concept...that a cup of 6% butterfat milk would give ~2 TBL more fat than a cup of regular whole milk. Not enough to change a recipe. I agree with Dawn...use it like whole milk and it will just make the ice cream richer.
LONG, LONG VERSION: Using a nutritional information book, I pulled the data on various types of milk.
Regular "whole" milk is termed 4% and has 150 calories in 8 oz. That means the weight of the fat compared to the total weight of an 8 oz glass of milk is 4%. One 8 oz glass has 8.2 grams of fat. 8 oz of milk converts to 226.8 grams. So (8.2/226.smileys/bigeyes.gif*100 = 4%.
However, the fat calories for whole milk tell a whole 'nother story. Whole milk has 8.2 grams of fat. Fat has 9 calories per gram. (8.2*9) = ~74 calories. The percentage of fat calories to the total calories of the milk is (74/150)*100 = 50%, which means 1/2 of that cup of milk is fat. (That would be 8 TBL)
The 6% butterfat worked out to 61% fat calories, which would be approximately 10 TBL of fat in the glass. (The calories worked out to about 200 calories for 8 oz.)
So you're getting an extra 2 TBL of fat with each 8 oz of milk.
(Conditional statement: I figured this out in bed last night at 11:45 pm. Consider yourself warned that it's probably a bunch of whooey.)
Here's the chart showing the fat calories in cow milk: 0% (fat-free), 1%, 2%, 4%(whole) and on to Cyn's 6% on the far right. Red column is total calories, blue column is the amount of fat in each 8 oz serving.
http://i56.photobucket.com/albums/g166/Finer_Kitchens/MilkFat.jpg
LONG, LONG VERSION: Using a nutritional information book, I pulled the data on various types of milk.
Regular "whole" milk is termed 4% and has 150 calories in 8 oz. That means the weight of the fat compared to the total weight of an 8 oz glass of milk is 4%. One 8 oz glass has 8.2 grams of fat. 8 oz of milk converts to 226.8 grams. So (8.2/226.smileys/bigeyes.gif*100 = 4%.
However, the fat calories for whole milk tell a whole 'nother story. Whole milk has 8.2 grams of fat. Fat has 9 calories per gram. (8.2*9) = ~74 calories. The percentage of fat calories to the total calories of the milk is (74/150)*100 = 50%, which means 1/2 of that cup of milk is fat. (That would be 8 TBL)
The 6% butterfat worked out to 61% fat calories, which would be approximately 10 TBL of fat in the glass. (The calories worked out to about 200 calories for 8 oz.)
So you're getting an extra 2 TBL of fat with each 8 oz of milk.
(Conditional statement: I figured this out in bed last night at 11:45 pm. Consider yourself warned that it's probably a bunch of whooey.)
Here's the chart showing the fat calories in cow milk: 0% (fat-free), 1%, 2%, 4%(whole) and on to Cyn's 6% on the far right. Red column is total calories, blue column is the amount of fat in each 8 oz serving.
http://i56.photobucket.com/albums/g166/Finer_Kitchens/MilkFat.jpg