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Objetivou-se, com esta pesquisa, determinar a exigência de cálcio de codornas japonesas machos, no período de 1 a 21 dias de idade. Foram utilizadas 280 codornas com peso médio de 8 ± 2 g na fase inicial. As variáveis estudadas foram consumo de ração (CR), ganho de peso (GP) e conversão alimentar (CA). O delineamento experimental utilizado foi o inteiramente ao acaso, constituído de sete níveis de cálcio para cada fase, com quatro repetições de dez aves por unidade experimental. Os níveis de cálcio foram 0,85; 1,00; 1,15; 1,30; 1,45; 1,60 e 1,75%. As suplementações de cálcio foram realizadas através do calcário calcítico da ração. Verificou-se que o CR, o GP e a CA apresentaram efeito quadrático com o aumento dos níveis de cálcio na dieta. Recomenda-se dieta contendo 1,24% de cálcio para codornas japonesas machos no período de 1 a 21 dias de idade. The objective of this study was to determine calcium requirement of male japanese quails from 1 to 21 days of age. 280 quails with average weight of 8 ± 2 g in the initial phase were used. The evaluated performance parameters were feed intake (CR), weight gain (GP) and feed conversion (CA). A completely randomized experimental design was used, with seven calcium levels and four replicates of ten birds per experimental unit. Calcium levels were 0.85, 1.00, 1.15, 1.30, 1.45, 1.60 and 1.75%. Limestone was added to the diet as calcium supplementation source. It was found that CR, GP and CA showed a quadratic effect with the increased levels of calcium in the diet. It is recommended diet containing 1.24% calcium for male japanese quail in the period from 1 to 21 days of age

Exigência de cálcio para codornas japonesas (Coturnix coturnix japonica) machos na fase de 1 a 21 dias de idade