The credibility of livestock enterprise depends on the productive potential of the livestock which in turn relies on the status of nutrition. As we all know that feeding itself is costing more in livestock industry and so critical care needs to be undertaken in feeding. The important aspect one should learn is to reduce the cost of production of the livestock products and improving the Feed: Gain ratio. An Animal Nutritionist should look into the seriousness of reducing the cost of kg milk production, the cost of kg mutton production, cost of egg production etc. Keeping all these in view, this book is written with a number of varied chapters and is totally divided under seven chapters covering the fundamentals of Animal Nutrition, Feed Technology and related aspects, Applied Nutrition, Ruminant Nutrition in detail, Dairy Cattle Nutrition, Buffalo Nutrition, Sheep and Goat nutrition, Non-ruminant nutrition covering Swine and Poultry feeding in detail. Horse and Quail nutrition are also included. Methane which is considered as the most contributory GHG is presented in a detailed manner including its mitigation techniques. The readers are requested to watch for certain biochemistry topics while dealing with Fundamental Nutrition Certain topics like Metabolic diseases, Maintenance of rumen health, Enzymes, Lignification, Cellulolysis, Direct Fed Microbials (DFM), Voluntary Feed Intake, Toxins in feeds etc are presented in the last chapter as a special mention. As an ultimate say is that we all work is for the sake of farmers. If we can increase the income of the farmers by about Rs 2 per day per animal, our goal is fulfilled I believe.