Effect of Non-Conventional Storage Methods on External and Internal Egg Qualities

Keywords: Traditional Egg Storage; Changes in Egg Quality; Optimum Egg Storage Duration


November 27, 2018


Abstract: To know and identify the traditional practices and generate relevant information on egg
storage methods, a survey work was conducted in the East Wollega Zone of Ethiopia. The survey was
carried out with a stratified sampling technique and a structured questionnaire using a total of 315
households (225 from rural and 90 from urban owning chickens) were purposefully selected. Two
experiments, of similar experimental materials, procedures and designs were conducted at different
time of the year (May and August) to evaluate these traditional storage methods at Haramaya
University poultry farm. A factorial experiment of 2 by 5 with completely randomized design using
storage containers and storage time as treatment was used. The storage times were 4, 6, 8, 12 and 20
days. Five most common egg storage containers were identified in the rural and urban areas of East
Wollega. These storage methods include cartons, polyethen bags, baskets, clay pots and teff grain.
The result further indicated that depending on the availability of the storage materials in the locality,
87 percent of the urban households (n = 90) store eggs in cartons and polyethene bags in order of
availability. Seventy nine percent of the rural households (n = 225) ranked teff as the most common
storage materials used followed by the basket and clay pots. Among the quality parameters
considered, weight loss (%) and daily weight loss (%) of eggs were highly affected (P < 0.001) by
storage containers, durations and their interactions during both experiments. The maximum weight
loss was observed after storage period of 16 days for all containers. Polythene bags storage maintained
minimum weight loss Vs the baskets at all stages of storage duration. Only storage durations had
significant effects (P < 0.05) on the egg shell thickness during experiment I. Inconsistent but
significant effect of storage durations was observed on the shell weight during experiment I, and
weights of yolk and albumen during experiment II. Storage containers during experiment I, and
storage durations during experiment II showed significant effects on albumen height and haugh unit
values. Except polythene bags which had higher albumen height and haugh unit values, the other
containers did not show significant variations for both parameters. The effect of storage duration on
these parameters was linear with increasing storage duration; and higher beyond the 16 days of
storage. Thus, it was concluded that using polyethylene bags and 16 days of storage could give the
best result to store eggs among the traditional methods compared in this experiment.