Repeatability of Egg Number and Egg Weight in Two Strains of Layer Type Chicken

Udeh, I.

doi:10.3923/ijps.2010.675.677

Cited by 7 publications

(9 citation statements)

References 3 publications

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“…This resulted in decrease in the bird variance and increase in the error variance at different age groups. Lower estimates obtained at different age groups in this study agreed with the report of [17] for egg length and egg shape index. The reverse was however, the case of Sanusi [16] that recorded higher repeatability estimates at peak egg production and low estimates at later periods.…”

Section: Resultssupporting

confidence: 91%

“…Ayorinde and Sado [14] also reported repeatability estimates of 0.58–0.60 for egg weight from reports of individual egg weight, taken over a 56 day period from Hubbard layers. These estimates are also corresponding to the estimates of more researchers [12], [14], [15], [16], [17], [9]. The aim of this study was to determine the effects of age variance on repeatability estimates of egg dimensions of Bovan Nera Black laying chickens which was achievable from the use of sensitive digital scale, vernier caliper sensitive to 0.00 cm and Panda [18] formula for measuring performance in each of the traits examined.…”

Section: Introductionsupporting

confidence: 63%

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Effects of age variance on repeatability estimates of egg dimensions of Bovan Nera Black laying chickens

John-Jaja

Abdullah

Nwokolo

2016

Journal of Genetic Engineering and Biotechnology

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The present research was designed to examine the effects of age variance on repeatability estimates of egg length, egg breadth and egg shape index of Bovan Nera Black laying chickens at 25, 51, 72 weeks and combined ages of the bird. For this purpose thirty birds were selected from the flock of layers in the Babcock University Teaching and Research Farm. They were individually housed in labeled separate battery cage. A total of thirty (30) eggs were collected daily from the birds continuously for five (5) days of egg production, at each age of 25, 51 and 72 weeks. The total number of eggs collected at each age were 150 and 450 for the total of three age periods. Data were collected on egg production traits for egg length, egg breadth and egg shape index. These data were subjected to statistical analysis using Completely Randomized Design. General linear model procedure of statistical analytical system (SAS) was used to obtain the variance components for the estimation of repeatability. Moderate repeatability estimates were obtained when the age variance was included in the computation and low estimates were registered when the age variance was excluded from the computation. The repeatability estimates from different egg quality traits were low to high. Since most of the traits recorded low repeatability values, these traits can be improve by mass selection thereby culminating into egg production with optimal quality.

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Section: Resultssupporting

confidence: 91%

Section: Introductionsupporting

confidence: 63%

Effects of age variance on repeatability estimates of egg dimensions of Bovan Nera Black laying chickens

John-Jaja

Abdullah

Nwokolo

2016

Journal of Genetic Engineering and Biotechnology

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“…Repeatability measures the degree of association between records of the same animal, and is characterized by being expressed more than once in an animal's life (Falconer, 1989), which indicates that repeatability estimates are beneficial in the context of quantitative genetics because they are designed set the upper limits of the levels of genetic variation. The advantage of this for breeding programmes is the increases in the proportion of additive genetic variation and improves the selection response (Udeh, 2010). The low repeatability evaluates reported for egg production parameters were attributed to the huge non genetic factors, Falconer (1989), who believes that the improvements of these traits are desirable that due to their economic importance.…”

Section: Advances Inmentioning

confidence: 99%

Repeatability Estimates of Egg Number and Egg Weight under Various Production Periods in three Lines of Local Quail

Ahmed¹

2021

AAVS

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Q uail is one of the poultry species, which has assumed worldwide importance as a laboratory animal due to its extensive use in studies for growth, selection and breeding. Different varieties of quail are nowadays bred in Kurdistan region in Iraq as supply the local markets with testy types of meat and egg particularly for the rural poor (Ahmed and Al-Barzinji, 2020). Quail is popular bird model in numerous fields of research because of its small body size, easily handled, and large number of quails can be reared in limited space. Short generation interval which make it possible to propagate many generations in a year (3-4 generation per year), resistance to many common avian disease and high egg production it has been considered as an excellent laboratory experimental bird, less feed and easy maintenance (Vali et al., 2006; Akpa et al., 2008). Early sexual maturity the females start to lay eggs at six weeks of age, but their full production usually begins at the age of 50 days (about 7 weeks). Females are very prolific because they averagely lay 300 eggs during their entire reproductive period which generally lasts 10-12 months (Kayang et al., 2004; Chełmońska et al., 2008; Alkan et al., 2010). The production of egg is regarded as one of the most performance parameters of laying birds. Despite effective roles of additive genetics on egg production, other factors including age at sexual maturity, bird weight, its nutrition, management and environmental systems might also affect egg production of quail (Daikwo et al., 2014).Breeding and genetic experimentation must be carried out continuously through genetic parameters such as estimation of heritability and repeatability for egg production traits in different strains and/ or breeds were many researchers pointed out that due to differences, there are many variations in these estimates of the genetic

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“…A number of studies on laying hens have demonstrated a relationship between the number of eggs, egg weight and the age as well as the weight of poultry (Bharali et al, 2020;Udeh, 2010;Vlčková et al, 2018;Yusuf et al, 2014;Zemková et al, 2007). With few exceptions, egg weights tend to be low at the beginning of the laying period and then increase with age.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Factors Affecting Productivity and Profitability of Lohmann Brown Layers in A Semi-Arid Environment

Samkange¹,

Kandiwa²,

Mushonga³

et al. 2020

AJVS

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A prospective 27-week study investigated the effect of age, ambient temperature, humidity and photoperiod on egg weight and production in Lohmann Brown layers, and thus the profitability of the egg-producing enterprise at a farm in central Namibia, designated Farm A. Overall, age of birds, average temperature, humidity and photoperiod were strongly correlated with mean egg weight (r=0.84, 0.7,-0.51 and 0.7, respectively; p<0.001) but there was a weaker correlation of age, temperature, humidity and photoperiod to the number of eggs/bird (r=0.49, 0.41,-0.43 and 0.34, respectively). Increase in the age of birds, temperature and photoperiod resulted in a significant increase in mean egg weight. A decrease in humidity, however, resulted in a significant increase in mean egg weight. Labour and feed costs contributed 51% and 14%, respectively, to the overall costs of the enterprise. Egg sales contributed the bulk of the income at 88%, which was followed by the sale of spent layers at 12%.The study concluded that Lohmann Brown layers performed well in the semiarid conditions of central Namibia provided that extreme environmental conditions are avoided. The high input costs, especially labour and feed, were the main constraints to profitability and finding ways to reducing these costs is key to increasing profitability. Increasing the size of the flock is one practical way of offsetting the high labour costs.

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Repeatability of Egg Number and Egg Weight in Two Strains of Layer Type Chicken

Cited by 7 publications

References 3 publications

Effects of age variance on repeatability estimates of egg dimensions of Bovan Nera Black laying chickens

Effects of age variance on repeatability estimates of egg dimensions of Bovan Nera Black laying chickens

Repeatability Estimates of Egg Number and Egg Weight under Various Production Periods in three Lines of Local Quail

Evaluation of Factors Affecting Productivity and Profitability of Lohmann Brown Layers in A Semi-Arid Environment

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