| Summary: | The best electrolyte balance value (EB) for broilers performance from 1 to 7, 1 to 14, 1 to 21 and 1 to 42 days of age was evaluated. Eight hundred and sixty four male Ross chikens ageing one day old, were reared on floor covered with shaving woods and fed diets based in corn-soybean combined with -50; 0; 50; 100; 150 and 200 mEq/kg of EB. The experiment was analized as randomized block design with six replicates of 24 chicks each experimental unit. Weigh gain, feed intake, feed efficiency (FE) were evaluated at 7, 14, 21 and 42 days of age. The best values of EB estimated were 173, 192 and 200 mEq/kg, respetivly for 14, 21 and 42 days of age. It was also observed that high levels of chlorine magnify the humidity of the litter by means of the increasing of the excretion of water.The best electrolyte balance value (EB) for broilers performance from 1 to 7, 1 to 14, 1 to 21 and 1 to 42 days of age was evaluated. Eight hundred and sixty four male Ross chikens ageing one day old, were reared on floor covered with shaving woods and fed diets based in corn-soybean combined with -50; 0; 50; 100; 150 and 200 mEq/kg of EB. The experiment was analized as randomized block design with six replicates of 24 chicks each experimental unit. Weigh gain, feed intake, feed efficiency (FE) were evaluated at 7, 14, 21 and 42 days of age. The best values of EB estimated were 173, 192 and 200 mEq/kg, respetivly for 14, 21 and 42 days of age. It was also observed that high levels of chlorine magnify the humidity of the litter by means of the increasing of the excretion of water.<br>Objetivou-se determinar os melhores valores de balanço eletrolítico (BE) para o desempenho de pintos de corte de um a 7; um a 14; um a 21 e um a 42 dias de idade. Utilizaram-se 864 pintinhos machos, Cobb, criados em galpão de alvenaria, cobertos com maravalha e alimentados com ração composta, principalmente milho e farelo de soja, combinadas com cinco níveis de balanço eletrolítico (- 50; 0; 50; 100; 150 e 200mEq/kg). Foi utilizado delineamento em blocos ao acaso, com seis repetições e 24 aves por unidade experimental. Avaliou-se o ganho de peso, o consumo de ração e a conversão alimentar aos 7, 14, 21 e 42 dias de idade e a matéria seca da cama ao fim do experimento. Não houve diferença estatística para as características estudadas aos 7 dias de idade. Os melhores valores de BE estimados foram de 173 e 192 e 200mEq/ kg, respectivamente, para fases de um a 14 dias, um a 21 e um a 42 dias de idade. Verificou-se também que altos níveis de cloro aumentaram a umidade da cama, por meio do aumento da excreção de água.
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