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EnglishA research was conducted to evaluate the effect of mycotoxins" adsorbent Mycosorb® on the hematological parameters of broilers (Ross) fed diets contaminated or not with aflatoxins. The welfare of broilers was determined by measuring heterophil/lymphocyte ratio. Blood samples were collected at 37, 44 and 51 days of age for the counting of total and differential leukocytes. Leukocytes counting were determined for lymphocytes and heterophils. The counting was based on the proportion of each cell type present in 100 counted cells. Heterophil/lymphocyte ratio was obtained dividing the rate of heterophils by the rate of lymphocytes. A total of 784 birds were used. Four treatments (seven replications of 28 birds each) were studied: T1= non contaminated corn (control); T2= contaminated corn (1 ppm aflatoxin) without adsorbent; T3= contaminated corn (1 ppm aflatoxin) + 1 kg Mycosorb®/t; and T4= non contaminated corn + 1 kg Mycosorb®/t. Data were analyzed through ANOVA and Duncan test was used for comparing the treatment means. Birds fed diets containing contaminated corn without mycotoxin adsorbent (T2) showed the highest numeric hematocrit index for all ages. However, significant differences (p portuguesAvaliou-se o efeito de adsorventes de micotoxinas a base de glucomananos esterificados Mycosorb® sobre a taxa de hematocrito, relacao heterofilos/linfocitos circulantes e peso vivo em frangos de corte Ross femeas alimentados com dietas contaminadas ou nao com aflatoxina. Aos 37, 44 e 51 dias de idade foram coletadas amostras de sangue para realizar o hematocrito e a contagem de leucocitos total e diferencial. Na contagem leucocitaria diferencial sao apresentados apenas os linfocitos e heterofilos em funcao do objetivo do trabalho, calculando-se a proporcao de cada tipo em cem celulas contadas. A relacao heterofilos/linfocitos foi calculada dividindo-se a taxa de heterofilos pela taxa de linfocitos. Os tratamentos com sete repeticoes de 28 aves cada, totalizando 784 aves, foram assim constituidos: T1= Dieta com milho nao contaminado (controle), T2= Dieta com milho contaminado (aflatoxina 1 ppm) sem adsorventes, T3= Dieta com milho contaminado (aflatoxina 1 ppm) + 1,0 kg/t adsorvente Mycosorb®, T4= Dieta com milho nao contaminado + 1,0 kg/t adsorvente Mycosorb®. Os dados foram submetidos a analise de variância e as medias de cada tratamento comparadas atraves do teste de Duncan. Aves alimentadas com milho contaminado e sem adsorvente de micotoxinas (T2) apresentaram, numericamente, em todas as idades, a maior taxa de hematocrito. No entanto, diferencas significativas (p