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Table 1 Nutritional features of milk reinforcers used and purpose of selection

From: Optimizing reproducibility of operant testing through reinforcer standardization: identification of key nutritional constituents determining reward strength in touchscreens

per 100 mL Low-Fat Plain Milk (LM) Strawberry Milk (SM) Plain White Milk (PM)
Calories (kcal) 40 65 65
Total Carbohydrates(g) 4.5 10.5 4.5
 Sugars (g) 4.5 10 4.5
Protein (g) 3 2.5 3
Total Fat (g) 1 1.5 4
 Saturated Fat (g) 0.5 1 2.5
Cholesterol (mg) 2.5 5 10
Sodium (mg) 50 45 50
Intent of contrast
 Caloric content low high high
 Fat/sugar content   high-sugar high-fat
 Flavor   strawberry plain