Disability and Nitrogen Retention of Native Chicken Returns That Contain Bread Flour Luh Suariani 1* , Ni Ketut Etty Suwitari 2 , Ni Made Yudiastari 3 Universitas Warmadewa, Denpasar, Bali-Indonesia {aniekwidiarsa@ymail.com 1 , ettysuwitary62@yahoo.co.id 2 , mdyudiastari@yahoo.com 3 } Abstract. One of the alternative feed ingredients that can be used as a source of energy in rations and provides a good chance is bread waste flour from bread that has been rejected for less than 1 week, then the bread is withdrawn from the market. This bread can still be used because it has nutritional content, namely Crude Protein 6.47%, Crude Fat 24.34%, Crude Fiber 0.85, Ash 1.90% and Metabolic Energy 2952Kcal / kg. The principle of determining the digestibility of nutrients is to calculate the number of nutrients consumed minus the number of nutrients released through feces (Ranjhan, 1980). The design used in this study was a completely randomized design (CRD) with 5 (five) treatments and 3 (three) replications, namely 0%, 10%, 20%, 30% and 40%. The provision of bread waste flour up to 30% can improve the digestibility of dry matter, organic matter, crude protein and Nitrogen retention of native chicken rations. Keywords: Digestibility; Retention; Ration; Native Chicken 1 Introduction Poultry farming, especially meat chickens, can generate very fast profits. This is because 52.6% of the need for female protein by the Indonesian people comes from poultry. In animal husbandry science, food is a part of environmental factors that need special attention, given that the cost of feed is 65% of the production cost [1]. Furthermore, it is said, 60% environmental factors, 30% climate and 10% management. The higher public awareness about the importance of nutrition causes the high consumption of animal protein. Free-range chicken or native chicken is one of the local poultry that is generally kept by breeders in rural areas.Native chickens are reared as producers of consumption eggs, hatching eggs and meat. The maintenance of free-range chickens, apart from being able to be cultivated part-time, is easy to maintain with simple technology, and can be sold at any time for urgent needs [2], the native chicken farm has promising prospects, both economically and socially, because its products are in the form of meat and eggs. is a highly nutritious food material [3] and the demand is quite high [4]. One of the alternative feed ingredients that can be used as a source of energy in rations and provides a good chance is bread waste flour from bread that has been rejected for less than 1 week, then the bread is withdrawn from the market. The basic ingredients of bread are 90% wheat flour and other ingredients such as eggs, milk so that the protein content is high enough, besides that bread also contains beta carotene, thiamin (Vit B1), riboflavin (vitamin B2), niacin and the minerals iron and calcium (3) ]. The results of the proximate analysis of the WARDS 2020, December 21, Indonesia Copyright © 2021 EAI DOI 10.4108/eai.21-12-2020.2305844