EVALUATION OF COMMERCIAL FEED WITH FEED ADDITIVES, USED IN BROILER DIETS.

National poultry production is located in regions with a c limatic regime characterized by very unstable environmental temperatures and high relative humidity during most of the year. The effects of heat are particularly important because they cause a decrease in feed consumption and generate mortality in chickens. fattening that can reach 20% of the population in the last week of life, when most of the investment has already been made. In addition, the poultry sector represents one of the most dynamic and important items in livestock activity, it is practiced by different social and economic levels, it constitutes an important source of work and meat production at low cost, compared to red meat. Ecuadorian livestock production, like many underdeveloped countries, is not self-sufficient to supply the production of food of animal origin for human consumption, which has made it necessary to constantly import basic raw materials for the production of animal feed. essentially grain corn, sorghum and soybean paste; The importation of these elements has a direct impact on the production costs of the product, an adequate feed balance will be nutritionally complete when it minimizes deficiencies, produces good quality carcasses, improves immunological competence and reduces stress. To achieve this purpose, alternatives have been sought for feed formulations, looking for raw materials of plant origin that lower production costs. The study was carried out in Macas, Morona Santiago, at 1020 masl, the evaluation of three commercial feeds and two food additives in the rearing of broiler chickens was investigated. A Completely Random Design (DCA) was used. With a 3 x 3 factorial arrangement, the treatments resulted from the interaction of the factors under study (9 treatments), with 16 observations (Ross line chickens) per treatment, which were located in rectangular compartments with an area of 1.6 m 2 constituting a total of 192 chickens, in a total area of 2265m 2. The basic materials used were 192 chickens of the Broiler breed of the Ross commercial line, balanced feed (P, Av, Ag), feed additives (Avizyme 1500 and 3 Nitro 20), vaccines, brooder, feeders, drinkers, thermometer, scale. As a result we obtained, with the best average is b1 (Pr) with 668.1g of weight increase/chicken; while, in the second range with the lowest response, b 3 (Av) is located with an average of 662.1 g of weight increase/bird. This is due to the fact that the feed (Pr) presented a high content of crude protein (21.7%), low in fiber (2.0%) and with 3426 kcal/kg of gross energy; while the balanced (Hz) presented the following values: crude protein (19.2%), high in fiber (6.5%) and with 3545 kcal/kg of gross energy, which determines the difference in growth and weight gain in the birds fed with the two balanced.