The productivity of livestock in Asia is found to be far below the global benchmark. The milk production per cattle in Bangladesh and Nepal, for instance, is only 305 kg and 459 kg per animal per year, respectively, compared to 7500 kg/animal/year in the USA and Europe (SAARC 2015). Improved efficiency of animal production is therefore critical in low and middle income countries. Poor quality and low availability of feeds are the main factors responsible for low productivity and inefficiency of livestock production (Blummel 2009). Therefore, choice of feed, its availability, feed optimisation strategy, and feed conversion efficiency play a key role in improving animal performance (Blummel et al. 2017). In the mixed farming system, generally farmers feed their livestock with whatever is available on their farm in the form of crop residues such as straw, stover, haulms, and other agricultural by-products. This basal feed is later supplemented with home-grown or purchased forage and concentrates, but with minimal understanding of the nutrient composition and actual nutrient requirements of the animal. This may, in many cases, result in over or under supply of key nutrients such as protein or energy relative to the level of production. In some instances, by not choosing the most cost-effective feed, the feeding costs are higher than they need to be. In this context ‘precision feeding’ is a technique that can be used to address the nutrient mis-match issue. It involves feeding of animals by matching the requirement of nutrients (for body maintenance, growth, pregnancy and production) with nutrient supply through the diet. The mobile phone based application called ‘On-farm Feed Advisor’ (OFA) developed by the International Livestock Research Institute (ILRI) helps farmers and extension workers to balance nutrients in the diet of dairy animals in the mixed farming context.