Efeito da temperatura de estocagem e do tipo de embalagem sobre a qualidade interna de ovos de codornas japonesas (Coturnix japonica) Effect of storage temperature and type of package on the internal quality of eggs from japanese quails (Coturnix japonica)

Avaliou-se o efeito de temperatura de estocagem e tipo de embalagem, na qualidade interna de ovos de codornas japonesas (Coturnix japonica, Temminck & Schlegel, 1849), no 5º, 10º, 15º e 20º dias experimentais. Utilizaram-se 192 ovos de codornas japonesas em delineamento experimental inteiramente casualizado e esquema de parcelas subdivididas, com vinte e quatro tratamentos e oito repetições de um ovo por unidade experimental. Os tratamentos foram constituídos pela combinação de duas temperaturas de estocagem (ambiente e sob refrigeração) versus três tipos de embalagem (papel, isopor e plástico), casualizada nas parcelas, versus quatro tempos (5º, 10º, 15º e 20º dias de estocagem), alocados nas subparcelas. As variáveis estudadas foram perda de peso (PP), em porcentagem, altura de albume (AA), em milímetros, e unidade Haugh (UH). Com o aumento do tempo de estocagem, houve redução da altura de albume e da unidade Haugh e aumento da perda de peso de ovos de codornas japonesas, armazenados sob temperatura ambiente. No decorrer do período de estocagem, os valores médios de altura de albume e unidade Haugh de ovos de codornas japonesas, estocados sob refrigeração foram maiores do que as respectivas médias de altura de albume e unidade Haugh de ovos estocados sob temperatura ambiente. O uso da embalagem de isopor proporcionou menor perda de peso dos ovos do que o uso das embalagens de papel e de plástico, independente do tempo e da temperatura de estocagem.<br>The effect of storage temperature and kind of package on the internal quality of eggs from japanese quails (Coturnix japonica, Temminck & Schlegel, 1849) on the 5th, 10th, 15th and 20th experimental days were evaluated. One hundred and ninety two eggs from japanese quails were used in a completely randomized outline and splitplot scheme, with twenty four treatments and eight replicates of one egg per experimental unit. The treatments were consisted from the combination of two storage temperatures (room temperature and under refrigeration) versus three kind of package (paper, isopor and plastic), randomized to the plots, versus four times (5th, 10th, 15th and 20th days of storage), allotted to the splitplots. The studied traits were weight loss, in percentage, albumen height, on millimeter, and Haugh unit. As long as storage time increased, albumen height and Haugh unit decreased and weight loss japanese quail eggs stored at room temperature increased. During the storage time, the average values of albumen height and Haugh unit of japanese quail eggs stored under refrigeration were higher than respective means of albumen height and Haugh unit eggs stored at room temperature. The use of isopor package allowed smaller weight of loss of eggs than the use of paper and plastic packages, independently of time and storage temperature

Effects of dietary trace mineral sources and levels fed to layers in their second laying cycle on the quality of eggs stored at different temperatures and for different periods

This study aimed at evaluating the effects of trace mineral levels and sources supplemented to diets fed to semi-heavy layers in their second laying cycle on the quality of eggs stored for 14 days at different temperatures. The experimental diets consisted of the inclusion of inorganic trace minerals (T1 - control: 100% ITM) and five supplementation levels of organic trace minerals (carboaminophopho chelates) (110, 100, 90, 80, and 70% OTM). Trace mineral inclusion levels (mg/kg feed) were: T1: control - 100% ITM: Zn (54), Fe (54), Mn (72), Cu (10), I (0.61) Se (0.3); T2 - 110% OTM: Zn (59.4), Fe (59.4), Mn (79.2), Cu (11.88), I (1.21) Se (0.59); T3 - 100%: OTM: Zn (54), Fe (54), Mn (72), Cu (10.8), I (1.10) Se (0.54); T4 - 90% OTM: Zn (48.6), Fe (48.6), Mn (64.8), Cu (9.72), I (0.99) Se (0.49); T5 - 80% OTM: Zn (43.2), Fe (43.2), Mn (57.6), Cu (8.64), I (0.88), Se (0.43); T6 - 70% OTM: Zn (37.8), Fe (37.8), Mn (50.4), Cu (7.56), I (0.77) Se (0.38). A completely randomized experimental design in a split-plot arrangement with 60 treatments of four replicates each was applied. The combination of six diets versus storage temperature (room or under refrigeration) was randomized in plots, whereas the sub-plots consisted of storage times (0, 3, 7, 10, and 14 days). Data were submitted to analysis of variance of a model in slip-plots in time using the software package SAS (2000) at 5% probability level. It was concluded that 70% OTM supplementation can be used with no damage to egg quality, independently from storage temperature or time. The quality of refrigerated eggs stored up to 14 days is better than those stored at room temperature