When cows produce milk, the energy intake is less than what is needed to meet the nutrient demands of the milk production. They mobilises body nutrient reserves, particularly body fat to try to meet the energy demand (1 pound of fat is roughly equivalent to the energy value of 3 pound of shelled corn.) Hence, cows actually lose considerable amount of weight during the process of producing milk.One way to meet the nutrient demands of milk production is by feeding cows natural, high-fat feeds.However, it is very important to ensure that the amount of natural fat sources being fed to cows does not exceed the recommended level. Once the limit for feeding cows natural fat sources is reached, rumen bypass fat becomes a logical option in order to increase ration energy levels higher.

In today's market, one of the main priorities for farmers is to increase the yield of milk production and therefore increasing the income for farmers. Bypass fat can provide a valuable payback, thus it is important to understand rumen protected fats in the diet of dairy cattle .