Interaction of hen production type, age, and temperature on laying pattern and egg quality

Tůmová, E.; Gous, R. M.

doi:10.3382/ps.2011-01951

Cited by 77 publications

(43 citation statements)

References 29 publications

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“…Numerous previous studies suggested that egg weight showed a curvilinear relationship with the increase of hen age (Di Masso et al, 1998;Suk and Park, 2001;Nangsuay et al, 2011;Tumova and Gous, 2012), and provided critical insights into controlling the increase rate of egg weight (Minvielle et al, 1994). However, these authors only evaluated the tendency and increment of egg weight between different weeks of age, lacking full evaluation of their genetic basis.…”

Section: Introductionmentioning

confidence: 94%

Genetic analysis for dynamic changes of egg weight in 2 chicken lines

Liu

et al. 2014

Poultry Science

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One of the main concerns for poultry producers is how to maintain egg uniformity and stability in size and weight following the rapid growth during the early laying period. In this study, we aimed to investigate the increase in egg weight with advancing hen age, and to estimate genetic parameters of these increment traits in 2 pure lines of chickens (i.e., 2,010 White Leghorn and 1,200 brown-egg dwarf hens), using the restricted maximum likelihood method with the DMU procedure. We collected age at first egg (AFE), first egg weight (FEW) and kept records of egg weight per 10 wk from 30 to 60 wk of age. Meanwhile, the increments of egg weight were calculated for the evaluation of age-dependent dynamic changes. The increment of egg weight gained dramatically before 30 wk of age and became slower with the advance of age. Heritability estimates of AFE were larger than 0.32, and the low to moderate genetic correlations between AFE and FEW were observed in the 2 lines. The FEW showed high variation level compared with egg weights at later ages in the 2 lines, and had moderate heritability estimates in White Leghorns (0.20) and dwarf hens (0.33). Egg weights at different ages were highly heritable in the 2 lines (h(2) ≥ 0.35), and had strong genetic and phenotypic correlations among different ages. The estimates of heritability for most increment traits were low to moderate, especially those increments for 10-wk intervals ranging from 0.00 to 0.14. The genetic correlations among 3 consecutive egg weight increments for 10-wk intervals were low to moderate. Our results in the 2 lines should provide important insights into the genetic architecture of increment traits and offer some suggestions for producing uniform and stable eggs in response to advancing age.

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Section: Introductionmentioning

confidence: 94%

Genetic analysis for dynamic changes of egg weight in 2 chicken lines

Liu

et al. 2014

Poultry Science

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“…Tumova et al [33] obtained 6.91 -7.81g at 28 -60 weeks of age in New Black breed; and 6.50 -6.91g for litter raised Hisex Brown at 60 weeks. However, Ewa et al [28] …”

Section: Phenotypic Least Square Means and Standard Error Of Egg Qualmentioning

confidence: 99%

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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“…Egg weight was increased progressively and significantly (P < 0.001) with increasing age of birds except 51 to 60-week age group. Tumova and Goust [24] studied the interaction of hen production type, and temperature on laying pattern and egg quality. The result revealed that a significant interaction between type and age (P < 0.015) was evident in egg weight, but egg component proportions were dependent only on hen type.…”

Section: Age Of Laying Henmentioning

confidence: 99%

“…Several studies observed such a decline in most of the traits that were evaluated in layers, with the exception of egg weight, which increased with age [23][24][25]27]. Egg weight is an expression of the overall egg size, and optimum egg size, and optimum egg size varies according to the market in different countries [7].…”

Section: Age Of Laying Henmentioning

confidence: 99%

“…This will at a certain point lead to breakage in such losses that it is not economical any longer to produce with the stock [22]. Hence, studies have been conducted on the effects of age on external and internal egg quality traits [2], [17], [23][24][25][26][27][28]. Of course, there are many review relating to production factors that affect egg quality traits [29][30][31][32][33], but the focus of this review was to present current understanding of production factors (breed, housing and age) influencing egg quality traits.…”

Section: Introductionmentioning

confidence: 99%

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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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Interaction of hen production type, age, and temperature on laying pattern and egg quality

Cited by 77 publications

References 29 publications

Genetic analysis for dynamic changes of egg weight in 2 chicken lines

Genetic analysis for dynamic changes of egg weight in 2 chicken lines

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

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

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