I can understand your question to increase the Milk Fat and SNF in lactating cows. Let me help you with few tips which will help you to know about the factors of increasing the Fat and SNF in them.  Fat and SNF % CANNOT be increased in milk from an animal, if it is being fed adequately and properly. Period. However, milk marketers do this on a day-to-day basis by adding butter or skim milk powder in water or fresh milk, which is actually “reconstituted” milk. Every animal has its innate quality in terms of genetic potential for example if it is 4% milk fat and 8% milk solids not fat (SNF). For every 880 grams of water, the cow requires 40 grams of milk fat and 80 grams of milk solids not fat to manufacture 1000 grams of milk. Hence, in the event of a short-fall in anyone, even water, there will be a reduction in total quantity of milk secreted rather than lower fat and snf. And if it all there is, it will be very marginal. The milk yield and fat percentage is based on genetic potential of a buffalo or a cow. You cannot increase the milk yield beyond it’s genetic potential. But most dairy farmers in India, do not even get the actual potential milk yield from their dairy animals. The primary reason for this malnutrition as well as the dairy cattle are put into various stress factors. So the easiest way to increase the milk yield to address the nutritional requirements as well as address the stress factors.