Abstract
Two duplicate experiments were conducted to determine: 1) the effects of oiling, washing, sanitizing, age, and strain of layer combinations upon albumen quality deterioration and variability after 1, 7, and 14 days of storage; 2) to estimate the egg sample size needed to measure Haugh units at 1, 7, and 14 days storage; and 3) to determine, on the day after lay, the sample size needed to predict the Haugh units of eggs after 14 days storage.Eggs were sampled at 8 week intervals from seven ages of two commerical strains. From each strain and age of layer, eggs were measured after 0, 1, 7, and 14 days storage. Samples of eggs treated with a total of thirty-seven combinations of oiling, washing, sanitizing and days of breaking were examined.Storage time and age of layer effects on albumen height and Haugh unit variabilities were curvilinear. Washing eggs before oiling, particularly when applied the day of lay, reduced the benefits of oiling in eggs stored 14 days. Reoiling after washing at 3 days tended to improve Haugh units in eggs stored 7 and 14 days. Combinations of oiling, washing, and sanitizing did not increase variability in Haugh units in storage. Oiling day of lay and subsequently washing, sanitizing and reoiling at 3 days was the best combination of treatments for the retention of Haugh unit storage quality.Estimated number of day old eggs required to obtain Haugh units ± 2.5 with a probability of .90 ranged from 18 for young pullets to 28 for old hens. When measured at 7 and 14 days, samples needed varied from 20 to 30. To predict 7 and 14 day Haugh units, approximately 50 day old eggs were required.
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