• 2022-06-10
• Adeoye A.A, Ajayi B. A., Olorunsola R. A.
• Volume 4, Issue 1

Abstract

Repeatability is the likelihood of an individual repeating its performance at any given time in subsequent measurement. It expresses the proportion of the total variance that is due to permanent or non-localized differences between individuals. A total of fifty (50) eggs were collected daily continuously for ten days from fifty (50) selected ISA brown layers in a base population at 31st week of age for egg quality analysis. The birds were kept at Poultry Unit, Teaching and Research Farm, Olusegun Agagu University of Science and Technology Okitipupa. Data collected on the egg quality were subjected to one-way Analysis of Variance (ANOVA) and Pearson correlation with the Computer aided Software, Statistical Analysis System (SAS, version 8), to estimate the repeatability and phenotypic correlations among the egg quality traits. The phenotypic correlations among the external egg quality ranged between -0.333 to 0.737 while internal egg quality ranged between -0.878 to 0.828. Low to high estimates (0.11 to 0.81) were reported for repeatability of most of the traits while 0.23, 0.11 and 0.12 were reported for egg weight, yolk weight and albumen height, respectively. The traits with high repeatability estimates require few record while those with low estimates require more records to effect selection for genetic improvement.

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