An experiment was carried out at the Department of Animal Science of the Federal University of Viçosa, Brazil, to evaluate the effects of different nutritional plans on the performance of male and female Ross broilers. A completely randomized experimental design with a 6x2 factorial arrangement (six nutritional plans x two sexes) with six replicates of 20 birds per experimental unit was applied. The nutritional plans adopted for males and females included 3, 5, or 28 feeds, and the other 3 plans included 28 feeds containing 92.5, 100, and 107.5% of digestible lysine requirements established according to a mathematical model developed exclusively for Ross broilers. The results showed that the tested 28-feed feeding programs are equivalent, and allow similar performance as compared to 3-and 5-feed feeding programs. Based on the lysine levels included in the different nutritional plans, it was possible to fit the equations: Y = -0.0079x + 1.2435 (R 2 = 0.981) for males and Y = -0.0084x + 1.1925 (R 2 = 0.978) for females, where "Y" is digestible lysine level (%) and "x" is average age in days. These equations are specific for multiple-phase feeding programs. The performance of male and female broilers fed the lysine levels established by the mathematical models was similar as to that of birds fed the other nutritional plans. This demonstrates that it is possible to determine broiler lysine

An experiment was carried out to evaluate the effects of different levels of digestible lysine in the diets of male and female broilers on protein and fat deposition.

Objetivo: Demonstrar os efeitos do tabagismo no Brasil, no tocante da saúde pública e na economia. Revisão bibliográfica: O tabagismo é um problema de saúde pública, causa mortalidade, morbidade e gera custos para o sistema. O Brasil apesar de ser referência internacional no assunto, ainda apresenta grande número absoluto de tabagista e sofre de suas consequências. Por essa razão, é importante atuar no tratamento desse vício. Sabe-se que a melhora forma de tratamento é a combinação entre medidas farmacológicas e não farmacológicas. E essas medidas podem ser empregadas de diferentes maneiras e com diferentes graus de evidência e eficácia. Devendo, cada abordagem ser individualizada para cada perfil de paciente. Considerações finais: Entender o contexto do tabagismo no país é fundamental para tomar dimensão dos efeitos do problema. Ao tomar tal consciência, fica clara, a importância do tratamento do tabagismo. O qual pode ser empregado de muitas formas, necessitando para isso de um bom conhecimento básico do assunto.