Method for the production of broilers characterized by the fact that a chicken producer uses a feed for standard chickens (100% ME) and then actively changes the feed for chickens to a feed for chickens with reduced energy level and uses this feed for chickens with reduced energy level along with 103 to 1011 CFU of Bacillus bacteria per gram of feed, where feed for chickens with reduced energy level has a metabolizable feed energy level (ME) reduced from 85% to 98% ME of the ME of a standard used chicken feed (total ~ 100% ME), where the standard used chicken feed (100%) has the following ME level: i): if the chicken is a chicken Hubbard, the ME level of the standard initiation feed (100%) is 3000 kcal / kg and the ME level of growth feed is 3080 kcal / kg； ii): if the chicken is a Ross chicken, the ME level of standard initiation feed (100%) is 3040 kcal / kg and the ME level of growth feed is 3140 kcal / kg； iii): if the chicken is a Cobb chicken, the ME level of standard initiation feed (100%) is 3023 kcal / kg and the ME level of growth feed is 3166 kcal / kg； and where the metabolizable energy level is determined according to the standard ME test (with and without the Cr2O3 marker) as described in the section "Standard assay of the metabolizable feed energy level (ME)" herein.Método para la producción de pollos de engorde caracterizado por el hecho de que un productor de pollos usa un pienso para pollos estándar (100% ME) y luego cambia activamente el pienso para pollos a un pienso para pollos con nivel de energía reducido y usa este pienso para pollos con nivel de energía reducido junto con de 103 a 1011 CFU de bacterias de Bacillus por gramo de pienso, donde el pienso para pollos con nivel de energía reducido tiene un nivel de energía de pienso metabolizable (ME) reducido de 85% a 98% ME de la ME de un pienso para pollos usado de forma estándar (total ~ 100% ME), donde el pienso para pollos usado estándar (100%) tiene el siguiente nivel de ME: i): si el pollo
