Objective: The study obtained data on the potential of local feed ingredients, both in quantity, quality, and continuity and to observe the absorption power and ability of livestock to use feed designed in vitro. Materials and Methods: The method uses a survey method of potential sources of animal feed and calculates the carrying capacity of ruminants and nutritional analysis of feed ingredients with proximate analysis. Feed formulations were made based on proximate analysis results of four formulas (P1, P2, P3, and P4) and tested in vitro. Results: First, Nganjuk district has the highest of the local food potential with the production of agricultural waste and agricultural industries, reaching 802,341.94 tons/year. Second, the most top carrying capacity analysis reached in Tulungagung district, which reached 62,534 ST/year or 43% of the total population of ruminants. Third, the results of the study of the quality of local feed ingredients indicate that each type of feed material has the right and proper nutrition given to ruminants. Fourth, the in vitro testing included showing P1 feed that had a very significant effect (p < 0.01) on dry matter digestibility and digestibility of organic matter of cows, respectively, 74.69% and 73.39%. Conclusion: The in vitro technique of making animal feed can be developed in the areas that have the potential to produce agricultural waste and agricultural industries to increase the carrying capacity of livestock. [J Adv Vet Anim Res 2020; 7(1.000): 92-102]

The extraordinary increase in demand for animal protein such as meat, eggs, milk, and other animal products, as well as the large quantities of protein feed inputs required for animal production, have principally spurred research into spirulina as an animal feed. Spirulina (Athrospira sp.) is a highly nutritious edible microalga and a prospective feed supply for many agriculturally significant animal species. Animal growth, fertility, beauty, and nutritional product quality have all been linked to spirulina. Spirulina consumption has been related to improved animal health and well-being in studies. Because of its nutritious and protein-rich composition, its impact on animal development was significant, and commercial production was raised to suit consumer demand. As a result, Spirulina is emerging as a cost-effective resource for increasing animal output in order to achieve long-term sustainability and a viable food security future.