Emulsificante na ração de pintainhas leves na fase de cria (1 a 35 dias de idade)

Abstract

The objective was to evaluate the inclusion of an emulsifying additive based on glycerol polyethylene glycol ricinoleate and different levels and lipid sources in the ration of light replacement birds during the rearing phase on productive performance. An experiment was conducted with chicks from 1 to 35 days of age. A total of 960 Novogen chicks were used, distributed in a completely randomized design, with eight treatments and six repetitions with 20 birds each. The treatments were designed according to a 2 x 2 x 2 factorial scheme, with the factors being two lipid sources in the ration (soybean oil or extruded whole soybeans), two levels of energy in the ration (3,000 and 2,918 kcal/kg of ration), and two levels of emulsifier addition (with and without). Performance and uniformity of the chicks at 35 days of age were evaluated. According to the results, there was no significant interaction between the studied factors or significant effect of the fat source or emulsifier addition on feed consumption; however, this variable was influenced by the energy level of the ration, with an increase in consumption observed for birds fed with the lower energy level of the ration. For weight gain, average weight at 35 days, and feed conversion, there was a significant interaction between the energy level and emulsifier use, with no significant effect of the fat source or its interaction with the other factors. With the breakdown of the interaction, it was observed that the energy level significantly influenced only the feed conversion of birds fed without emulsifier, which showed worse feed conversion. On the other hand, the addition of the emulsifier significantly influenced only the results obtained with the low-energy ration, promoting an increase in weight gain and average weight at 35 days and better feed conversion. It was found that soybean oil and extruded whole soybeans do not differ in providing energy for laying birds during the rearing phase and that the addition of the emulsifier can compensate for the 82 kcal reduction in the ration.