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In this study, the effect of different USP glycerin levels in diets of broiler chickens with 85% energy restriction from 5 to 21 days of age was evaluated. Broilers received diets including 0, 2.5, 5.0 or 7.5% USP glycerin during restriction period. Each treatment had 6 repetitions and 26 chicks per repetition. Daily, rectal temperature of two chickens was determined per repetition. Weekly, body weight and feed residuals were measured to calculate intake and feed conversion. Broilers were slaughtered at day 42. Variables were analyzed through a completely randomized design with 4x2 factorial arrangement. Energetically restricted broilers deposited more abdominal fat (P<0.05) and did not reach unrestricted body weight, however, they registered a lower (P<0.05) feed conversion and right ventricle-to-total ventricle ratio (RV/TV). Glycerin USP inclusion in initiation diets linearly affected (P<0.05) the moment in which broilers stabilize body temperature. In addition, feed conversion and breast yield tended (P<0.1) to improve with inclusions between 2.5 and 5.0 % glycerin USP, during the initiation phase. Finally, it was observed that, in unrestricted broilers, those who consumed diets with 5 or 7.5% glycerin USP registered a greater economic benefit. In conclusion, USP glycerin use in broiler chickens fed will improves productive and economic responses.

Utilización de glicerina USP durante una restricción energética temprana en pollos de engorde