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EnglishThe present research was conducted to evaluate whether different beak trimming methods and rearing systems affected the feed selectivity of laying hens. A total of 178 Hy-line Brown laying hens in the growing phase and 120 hens in the production phase were divided in a factorial arrangement (2 x 3), with two rearing systems (floor and cages) and three beak trimming methods: without beak trimming (control), hot-blade beak trimming, and infrared beak trimming, with four replicates. Laying hens were feed with isonutritive diets. Samples were collected from feed orts and feed provided, with a subsequent analysis of dry matter, crude energy, crude protein, mineral matter, geometric mean diameter and geometric standard deviation. The results were subjected to the error normality test, analysis of variance and the Fisher-Snedecor (P Key words: animal welfare; cage-free; feed selection portuguesO presente trabalho foi conduzido para avaliar se diferentes metodos de debicagem e sistemas de criacao afetam a seletividade alimentar de galinhas poedeiras. Foram utilizadas 178 aves na fase de recria e 120 aves na fase de producao, da linhagem Hy-line Brown, divididas em um delineamento experimental em esquema fatorial (2x3), com dois sistemas de criacao (piso e gaiolas) e tres manejos de bico: sem debicar (controle), debicagem por lâmina quente e radiacao infravermelha, com quatro repeticoes. As aves foram alimentadas com racoes isonutritivas e foram coletadas amostras das sobras e das racoes controle, com posterior analise da materia seca, energia bruta, proteina bruta, materia mineral, diâmetro geometrico medio e desvio padrao geometrico. Os resultados foram submetidos ao teste de normalidade dos erros, analise de variância e aos testes de medias de Fisher-snedecor (P Palavras-chave: bem-estar animal; cage free; selecao de racao

Feed selectivity of laying hens undergoing different beak trimming in two rearing systems