Abstract
. It was evaluated the effects of diets containing mannan oligosaccharides (MOS) and reduced calcium (Ca) levels on Japanese quail eggs quality. Two hundred quails, at 40 days of age, were used during three periods of 28 days each one. The experimental design was entirely randomized in factorial arrangement 2 x 2 + 1 (Ca x MOS levels and a control diet), with four replicates. The treatments were Ca (2.2 and 1.9%) and MOS (0 and 0.1%) levels and a control diet (with no MOS and with 2.5% Ca). It was studied the internal quality (weight and index of yolk and albumen and Haugh unit) and external (eggshell weight, Ca content, and thickness and specific gravity) of quail eggs. There was no effect (P>0.05) of the treatments on the weight and index of yolk and albumen, Haugh unit and eggshell weight and thickness. However, MOS inclusion increased (P<0.02) Ca content on the eggshell in 2.75% and the reduction of Ca levels decreased (P<0.01) the specific gravity of eggs from quails fed diets containing 1.9% of Ca. It was concluded that diets with 1.9% of Ca and supplemented with 0.1% of MOS can be used by Japanese quails with no negative effects on the internal and external quality of the eggs.
Highlights
A criação de codornas japonesas (Coturnix coturnix japonica) é uma atividade que vem crescendo pelo aumento do consumo de ovos pelas indústrias beneficiadoras, que passaram a fornecê-los para o mercado consumidor de ovos processados
The article evaluated the effects of diets containing mannan mannanoligosaccharides (MOS) and calcium (Ca) levels on quail eggs quality
It was concluded that diets with 2.2% of Ca, supplemented with 0.1% of MOS, can be used by Japanese quails, at the initial phase of laying, with no negative effects on the internal and external quality of the eggs
Summary
Foram utilizadas 200 codornas fêmeas (Coturnix coturnix japonica), com idade inicial de 40 dias e peso médio de 126,18 g, durante 84 dias, divididos em três períodos de 28 dias cada. As rações experimentais que constituíram os tratamentos resultaram da combinação dos níveis de Ca (2,2 e 1,9%) e de MOS1 (0 e 0,1%) e da dietacontrole (sem MOS e com 2,5% de Ca) (Tabela 1) e foram formuladas com base nas composições dos ingredientes apresentadas por Rostagno et al (2005) para atender as exigências nutricionais das codornas (NRC, 1994), exceto para os níveis de Ca. Tanto a água quanto as rações foram fornecidas à vontade, sendo as rações distribuídas diariamente duas vezes ao dia, às 8 e 17h. Até atingir 17h de luz por dia, programa que foi mantido até o final do período experimental.
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