No, no, no.
Milk is not good for the cats. (only their own milk is edible for kittens)
Lactose is not good for cats. 

Hello, I have always fed my kitten with the best, its milk and that it is very clean.

Msd0457890

I have cats . I love cats very much. My cats like fish very much. 

Beast_Vstar

Animal_World

I recently read in an article that the higher the quality of the protein in the food, the less the amount of cat feces. I guess the same goes for dog food. 
In other words, we can understand the quality of the food in a sense in this way. 
Fresh fish is one of the most important quality proteins. 