Internal quality and shelf life of eggs coated with oils from different sources.
UNLABELLED
Selected internal quality and shelf life of eggs coated with oils from differences sources (mineral oil, canola oil, corn oil, grape seed oil, olive oil, soybean oil, and sunflower oil) were evaluated during 5 wk of storage at 25 °C. As the storage time increased, weight loss increased whereas Haugh unit and yolk index values decreased. Throughout the 5 wk of storage, eggs coated with oils, regardless of oil sources, possessed better albumen and yolk quality than the control noncoated eggs. Oil coating minimized weight loss of eggs (<0.8%) compared with that (7.26%) of the noncoated eggs after 5 wk of storage at 25 °C. No significant differences in internal quality (weight loss, Haugh unit, yolk index, and albumen pH) were generally observed among oil-coated eggs during 5 wk of storage. Based on the Haugh unit, the grade of noncoated eggs changed from AA at 0 wk to A at 1 wk and to B after 3 wk whereas that of oil-coated eggs from AA at 0 wk to A at 4 wk and maintained A grade until 5 wk. This study demonstrated that oil coating, irrespective of oil sources, preserved the internal quality, minimized weight loss (<0.8%), and extended the shelf life of eggs by at least 3 wk longer than observed for the noncoated eggs at 25 °C storage. Soybean oil was a more practical option as a coating material for eggs due to its low cost.


PRACTICAL APPLICATION
Eggs are highly perishable and susceptible to internal quality deterioration when stored above 7 °C. Refrigeration of eggs may be seldom practiced in some developing regions of the world. Therefore, an alternative method, that is inexpensive yet effective, to preserve the internal quality of eggs and to prevent microbial contamination is needed. Oil coating has been proven to preserve the internal quality, prolong shelf life, and minimize weight loss of eggs. This study demonstrated that, compared with other vegetable oils, soybean oil was a more practical option as a coating material for eggs during 5 wk of storage at 25 °C due to its low cost.
Glycerin as a factor for moderating quality changes in table eggs during storage
Abstract. Glycerol, a by-product of biodiesel production, is non-toxic to humans and
the environment. With the current increase in the demand for fuels obtained from
biomass, the amount of glycerine waste production is increasing. There are many ways to
dispose this substance (in pharmaceuticals, cosmetics, and in chemical industry),
but its utilization is still insufficient. Therefore, the aim of this study was to assess
the possibility of limiting quality changes in table eggs during
storage by coating the shells with a glycerol solution. The material used in this research consisted
of 270 table chicken eggs collected on the same day. On the first day of the
experiment, quality traits of 30 eggs were evaluated (initial control group). The
remaining 240 eggs were divided into two equal groups: control (eggs that
were not subjected to any treatment) and experimental (eggs that were coated with a
5 % aqueous solution of glycerol). The eggs were placed on transport
trays and stored at 14 ∘C and 70 % humidity. Quality
evaluations were carried out after 14 and 28 days of storage. The depth of the air cell,
mass and specific gravity of the egg, the shell characteristics (water vapour
conductance, strength, mass, thickness, and density), and the content traits (pH
of the albumen and yolk, Haugh units, and colour and weight of the yolk) were evaluated.
The results obtained suggest that the use of glycerine may contribute to
slowing adverse changes in egg quality during storage by limiting
CO2 removal from the egg content, which allows the egg to maintain albumen
structure. Due to the fact that glycerine is a safe, cheap, and easy-to-apply
substance, its large-scale use in poultry raw material storage seems to be a very real possibility.

Effect of Soybean Cyst Nematode (Heterodera glycines) on Yield of Resistant and Susceptible Soybean Cultivars Grown in Ohio.
Soybean (Glycine max) producers in Ohio rarely use soybean cyst nematode (Heterodera glycines, SCN)-resistant cultivars because of concerns over limited yield potential and lack of resistance to Phytophthora sojae. A two-year study was initiated to determine grain yield and nematode population increase on soybean cyst nematode-resistant cultivars in maturity groups II and III in production fields. Sites differed in soil texture, nematode densities, and P. sojae infestation at a number of locations in Ohio. Soil was assayed for nematode densities before planting and at harvest. Yields of resistant cultivars averaged 0% to 18% higher than those of susceptible cultivars in fine-textured soils with average preplant populations ranging from 463 to 14,330 SCN eggs/100 cm(3) soil. In coarse-textured soils, yields of susceptible cultivars were 21% to 56% less than the resistant cultivars with average preplant densities ranging from 1,661 to 15,558 SCN eggs/100 cm(3) soil. The reproductive index ranged from 0.1 to 5.5 for resistant cultivars and 0.4 to 112 for susceptible cultivars. In 1993, yield of P. sojae-susceptible, nematode-resistant 'Asgrow A 3431' was as high as yield of the P. sojae-resistant, nematode-susceptible cultivar 'Resnik' in a Phytophthora-infested field. The nematode-resistant cultivars Madison Experimental 131527 and Asgrow A3431 had higher yields than AgVenture AV1341 and susceptible cultivars Resnik and Kenwood when compared over five nematode-infested sites. Nematode-resistant cultivars were found to be excellent alternatives to currently grown susceptible cultivars for managing SCN where group III cultivars are used. However, better cultivar alternatives may be needed for sites with combined Phytophthora root rot and cyst nematode problems.