Abstract
Aiming to assess isoleucine levels in low protein diets for laying Japanese quails, 648 quails of 182 days of age were distributed in experimental block design with six treatments and six replicates of 18 birds each. Treatments consisted of a basal level corresponding to 0.672% isoleucine and supplemented with isoleucine to the levels of 0.816, 0.960; 1.104; 1.248%. The experimental diets were compared to a control diet containing 20% CP. The parameters studied were: performance, egg quality, total solids and nitrogen in the excreta. There was a linear increase only for isoleucine intake with increasing levels of isoleucine in the diets. The comparison of mean values of each combination of isoleucine levels for diets with 16% CP with the control with 20% CP showed that the intake of CP and isoleucine, egg weight, nitrogen excretion and yolk color were significantly affected. For Japanese quail fed diets with 16% CP, with isoleucine level at 0.672%, meets the requirements for obtaining satisfactory performance and egg quality and promoted a reduction in nitrogen excretion.
Highlights
Coturniculture is an important activity that is currently highly relevant in the Brazilian agriculture sector, but despite the increasing production, much is still unknown about Japanese quail nutrition
Animal Sciences feed without the correct supplementation of essential amino acids causes a reduction in feed intake and egg production, as well as altering the social behavior of the birds, resulting in cannibalism (Peganova & Eder, 2003)
Because of the availability of synthetic amino acids in the market, an alternative for cost reduction and for diet optimization is their incorporation to the feeds, allowing the formulation of diets containing crude protein levels lower than those nutritionally required
Summary
Coturniculture is an important activity that is currently highly relevant in the Brazilian agriculture sector, but despite the increasing production, much is still unknown about Japanese quail nutrition. Those referring to protein levels are noteworthy, since excessive protein levels in feed are costly, in addition to increasing the excretion of nitrogen and environmental pollution. The simple reduction of protein levels in. Animal Sciences feed without the correct supplementation of essential amino acids causes a reduction in feed intake and egg production, as well as altering the social behavior of the birds, resulting in cannibalism (Peganova & Eder, 2003). Because of the availability of synthetic amino acids in the market, an alternative for cost reduction and for diet optimization is their incorporation to the feeds, allowing the formulation of diets containing crude protein levels lower than those nutritionally required
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