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O objetivo do presente estudo foi mensurar os niveis plasmaticos de proteina plasmatica total (PPT), albumina e ureia, hematocrito e escore da condicao corporal (ECC), visando avaliar o efeito da suplementacao com ureia sobre o perfil proteico e o indice de prenhez (IP) de vacas de corte em lactacao, mantidas em campo nativo, durante o periodo de verao. O experimento ocorreu entre setembro/2002 (primavera) e fevereiro/2003 (verao). As matrizes foram divididas aleatoriamente em dois grupos: controle © n=161) e tratado (T) n=159). Os grupos receberam mistura mineral, porem o T, recebeu adicionalmente 10% de ureia agricola em janeiro e fevereiro. Relativamente a PPT, nao foi observada diferenca entre T e C, no verao. Na albumina, nao foi observada diferenca entre primavera e verao. O C apresentou concentracoes maiores no verao do que o T. Os valores do hematocrito, no C de verao foram maiores do que os do C da primavera e T de verao. Na ureia o grupo T, no verao, apresentou niveis maiores do que os C de primavera e verao. Nao houve diferenca nos ECC entre primavera e verao, assim como entre T e C, no verao. Quanto ao IP, nao houve diferenca entre C e T. Em conclusao, a ureia tem efeitos deleterios sobre o perfil proteico de vacas de corte com cria ao pe, no verao, quando ha alta disponibilidade de massa verde. A adicao de ureia a mistura mineral nao influencia a eficiencia reprodutiva das matrizes. Protein profile and reproductive efficiency of lactating beef cows, supplemented with urea during the summer Abstract The objective of the present study was to assay total protein (PPT), albumin and urea plasma levels, hematocrit, body conditions score (BCS) and pregnancy rates (PR) in beef cows supplemented or not with urea during the summer. The experiment started in September (spring) 2002 and ended in February (summer) 2003. The dams were randomly assigned in two experimental groups: control (C; n = 161) and treated (T; n = 159). Both groups received a complete mineral mix. For the T group, a total of 10% of agricultural grade urea was added to the mix during January and February. As a result, no differences in PPT has been observed between both experimental groups during the summer. However, in regard to plasmatic albumin no differences were found for both experimental groups between spring and summer but values showed to be higher for the C group than in T group during summer. There were no differences in BCS nor in IP. The addition of urea to the mineral mix has deleterious effects upon the protein profile os suckling beef cows, when trere is high avalability of forage. The use of urea has no effect on reproduction performance.

PERFIL PROTÉICO E EFICIÊNCIA REPRODUTIVA DE VACAS DE CORTE EM LACTAÇÃO SUPLEMENTADAS COM URÉIA NO VERÃO