Heritability estimates of external egg quality traits of Exotic Laying Chickens under the influence of age variance in the tropics

John-Jaja, Sylvia Alwell; Abdullah, Abdur-Rahman; Nwokolo, Samuel Chukwujindu

doi:10.1016/j.jssas.2016.07.007

Cited by 5 publications

(8 citation statements)

References 8 publications

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“…Each bird was fed on average of 131g per head per day with water supplied and libitum for the period of 50 weeks of experimentation and data collection [13]. The detail of the experimental birds and management is found in John-Jaja et al [13], [14].…”

Section: Experimental Birds and Managementmentioning

confidence: 99%

“…Randomization was performed using a random number table, computer, program (i.e. number of treatments and replicates is only limited by the available number of experimental units) [13], [14].…”

Section: Experimental Designmentioning

confidence: 99%

“…A total of thirty (30) eggs were collected daily from the bird continuously for five (5) days of egg production, at each ages 25, 51 and 72 weeks. The total number of eggs collected at each age was 150 for three age periods (25, 51 and 72 weeks) [13], [14].…”

Section: Data Collectionmentioning

confidence: 99%

“…Statistical analytical system was used to obtain the variance components for the estimation of heritability while the error in the estimation of heritability was calculated using Becker [14].…”

Section: Statistical Metricsmentioning

confidence: 99%

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Heritability estimates of egg weight and egg shell weight in Ikenne, Nigeria

John-Jaja¹,

Abdullah²,

Nwokolo³

2017

Int. J. Sci. World

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This study is designed to determine the inheritance pattern of egg weight and egg shell weight of exotic laying chickens at 25, 51, 72 weeks and overall mean ages of the birds. For this purpose, thirty eggs were collected daily from the birds continuously for five days of egg production, at each ages 25, 51 and 72 weeks. The total number of eggs collected at each age was 150 and 450 for the total of three age periods. The mean values of egg weight and egg shell weight revealed an apparent increase from 25-72 weeks of age with their corresponding overall mean values. The least square means of egg shell weight at different age groups are significantly different at (P<0.01) while egg weight was significantly the same since egg shell weight depends on age variance for adequate performance. Statistical analytical system was used to obtain the variance components for the estimation of heritability. High and moderate heritability estimates were obtained when the age variance were included in the computation at different age groups for both traits while high, moderate and low estimates were obtained when the age variances were excluded. The heritability estimates from different egg quality traits were low to high. Since egg weight yielded high estimates at various age groups, the low and moderate heritability estimates recorded for egg shell weight imply that collection of additional records and improvement of non-genetic factors influencing the trait will improve the accuracy of characterizing the inherent ability of the birds.

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Section: Experimental Birds and Managementmentioning

confidence: 99%

Section: Experimental Designmentioning

confidence: 99%

Section: Data Collectionmentioning

confidence: 99%

Section: Statistical Metricsmentioning

confidence: 99%

See 2 more Smart Citations

Heritability estimates of egg weight and egg shell weight in Ikenne, Nigeria

John-Jaja¹,

Abdullah²,

Nwokolo³

2017

Int. J. Sci. World

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“…Finally, the overall result revealed that the interaction between housing and genotype resulted in large difference in measurement of egg weight and egg shell quality. Minelli et al [75] compared the physio-chemical properties of egg laid either by hens reared according to the organic method or by caged hens kept in conventional system. The result indicates that the egg obtained from the organic system were higher (64.4 vs 66.2g) being yolk, albumen and eggshell weights statistically lower in comparison with those produced in conventional system.…”

Section: Housingmentioning

confidence: 99%

A critical review of production factors that influ-ence egg quality traits

2017

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The global poultry industry has experienced significant changes in the methods used to harvest and process the fresh egg over the past century. Applications of animal genetics and breeding have significantly increased in line speed for poultry operation. In this study aims at reviewing production factors that influence egg quality traits across the globe. The production factors so far utilized were classified into three main categories and presented based on their influencing capacity. For this purpose, two types of search criteria to find publications relevant to the scope of this review were employed. The first type was an automatic search performed on the following publishers' databases: ScienceDirect, Google's scholar, researcher gates, academia. The second type was a manual search on conferences, recent theses and dissertation that have not been published in journals from numerous Babcock University. Generally, 23 publications were reported for the breed; 17 for housing, and 19 for age of the breed after excluding studies that do not focus explicitly on breed, housing and age of the bird as production factors that influenced egg quality traits out of 183 potential relevant articles identified from

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