Estimation of Variance Components Based on Diallel Crosses of Four Lines of Norfa Chickens

El-Ghar, R. S. A.; MAHMOUD, TAHA H.; Gebriel, Goda M.; Abdou, F. H.; Enab, A. A.

doi:10.21608/ejar.2004.256810

Cited by 3 publications

(4 citation statements)

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“…These results indicate that additive genetic variance may be a common in the inheritance of these trait. This conclusion dealt with those cited by Abdou, 2004 andAbou El-Ghar, 2005). The observed estimates of random environmental variation (σ²e) were - 85870517.2, -229250, -193661.8, -6.1017 and -3.77827, respectively.…”

Section: Results and Discutionssupporting

confidence: 62%

Estimation of Additive, Dominance and Heritability of Some Egg Production Traits in Egyptian Local Strains of Chicken

2016

EPSJ

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Egg production in poultry shows considerable individual variation over the laying period. Evaluation and selection of Egyptian local strain of chicken had been carried out. The aim of the present study was to estimate additive, dominance, heritability for some egg production traits and to determine the best strain based on multiple egg production traits. The four strains showed that Mandrah strain was ranked first, Doki-4 was ranked second, the strain Inshas was ranked third and El-Salam was ranked last in the performance of some egg production traits. The estimate additive genetic variance accounted a major part of the total genetic variance for sexual maturity, mature egg weight, early egg weight, number of eggs at 90 d of laying, egg mass at 90 d of laying and body weight at sexual maturity. The estimates of dominance genetic variance in these traits was relatively negative and low. The estimated heritability was almost 0.4 for all egg production traits studied. The present results showed clearly that Mandrah local strains of chicken may considered the fitting strains that play an important role in improving egg production.

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Section: Results and Discutionssupporting

confidence: 62%

Estimation of Additive, Dominance and Heritability of Some Egg Production Traits in Egyptian Local Strains of Chicken

2016

EPSJ

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“…At the last generation of the study average of BWM in second was heavier than first generatin by 11.177 g. Current study results of Norfa mature body weight are in good agreement with those found by researchers over-time. From the reviewed articles, Norfa chickens body weight at maturity ranged from 1007.8 g (El-Wardany et al, 1992) and 1549.0 g (Abou El-Ghar, 2003).…”

Section: Body Weight At Maturity (Bwm)mentioning

confidence: 99%

Improving Some Productive Traitsof Norfa Chickens Using Selection Index

Enab,

Abdou,

Soltan

et al. 2024

Menoufia Journal of Animal Poultry and Fish Production

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The recent experiment was carried out at the Poultry research farm of the Faculty of Agriculture, Menoufia University, Shebin El-Kom, Egypt, during the period from 2019 to 2022 for two generations aiming to improve some egg production traits by using selection indices in Norfa chickens. Data on 1078 Norfa hens including age at sexual maturity (ASM). body weight at sexual maturity (BWSM). egg weight at sexual maturity (EWSM) and egg number during the first 90 days of laying (EN90) were individually recorded. Data computerized and selection applied by selection index method helping appropriate statistical and genetic analysis software programs. Results showed that, in the second generation of the study sexually matured earlier than the first by 12.17 days. In addition, either body weight or egg weight in the second and the first generation didn't differ significantly in second and first generation. Application of selection index method resulted in improving average EN90 in the second generation compared with first generation by 2.5995 eggs (with high statistical importance). The highest value of h2 (heritability) recorded by body weight (0.231 and 0.197 for BWSM and BWM, respectively). Moreover, the lowest heritability estimates detected for EN90 (0.130) and EWM (0.117) in studied flock of Norfa chickens. Moderate to high estimates (0.255, 0.186 and 0.368) of h2 were observed for EN90, EWSM and ASM, respectively, in current study. Results showed that using general index in selection for one generation resulted in improving egg production traits under investigation. The actual genetic gains for ASM, BWSM, BWM, EN90, EWSM, EWM and EN42 were -11.724 days, +52.88 g, +11.177 g, +2.5951 eggs, -1.1244 g, -0.391 g and +6.4637 eggs, respectively. It can be concluded that applying selection indices including the main egg-laying traits (i.e., EN42, EWM and BWM) leads to improve laying performance of Norfa hens regardless of the negative correlations detected between some traits at a multi-trait selection method.

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“…The current results are close to those reported by some previous works on the same strain (Norfa), especially, for light body weight lines and selected lines for egg number (El-Wardany 1987, El-Wardany et al 1992, Abou El-Ghar 1994and El-Salamony 1996 with average of BWM ranged between 1007.8 to 1096.0 g. Slightly higher values were recorded (1117.8 -1192 g) by some researchers for different types of Norfa lines (Enab 1991, Enab et al 1992a, Enab et al 1992b, Ben Naser 2007, Abou-Elewa 2010 and El-Weshahy 2010). In addition, higher values of body weight at maturity were obtained with average ranged from 1204.0 to 1549.0 g (Sherif 1991, Abdou and Enab 1994, Abou El-Ghar 1994, Nawar 1995, Abdou 1996, El-Salamony 1996, Harfoush 1997, El-Sakka 1999, Enab et al 2000, Enab 2001, El-Hadad 2003, Abou-Elewa 2004, Abou El-Ghar and Abdou 2004, Ben Naser 2007and El-Weshahy 2010. Regarding the reviewed literature, we didn't find any lower values of BWM in Norfa females than these reported in our research.…”

Section: Body Weight At Maturity (Bwm)mentioning

confidence: 99%

“…The mean of EWSM was 32.0 ± 3.26 g in the current experiment as shown in Table (2) Comparing with early studies conducted on Norfa strain, the value obtained by the present study was the lowest one. Some investigators reported different estimates of the EWSM average ranged from 32.7 to 44.2 g (Enab 1991, Sherif 1991, Abou El-Ghar 1994, Nawar 1995, El-Salamony 1996, Enab 1996, Gomaa 1997, Harfoush 1997, El-Sakka 1999, El-Hadad 2003, Abou El-Ghar and Abdou 2004, Ben Naser 2007, Abou-Elewa 2010and El-Weshahy 2010. The low EWSM value in the current experiment should be correlated to the low BWSM recorded, since it has been reported that, EWSM positively correlated with body weight at sexual maturity.…”

Section: Egg Weight At Sexual Maturity (Ewsm)mentioning

confidence: 99%

Studies on Some Productive Traits in Norfa Chickens

Enab,

Soltan,

Abdou

et al. 2015

Menoufia Journal of Animal Poultry and Fish Production

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The current experiment had been carried out at the Poultry Farm of the Faculty of Agriculture, Minoufiya University, Shebin El-Kom, Egypt in the period of 2012 to 2014 for two generations to investigate the productive performance of Norfa strain as an indigenous Egyptian laying strain. A total of 528 birds (396 females + 132 males) of Norfa chickens were used. Artificial insemination was used as a mating system with sexual ratio 1 male / 3 females, and relatives mating was avoided. At hatching, all chicks were wing banded and pedigreed. Chicks were fed a starter diet containing 18.05% crude protein (CP) till 8 th week of age and from 9 th to 16 th week of age, chickens were fed a growing diet containing 14.01% CP then, pullets were fed at production period a layer ration containing 17.46% CP. Cockerels were separated from pullets in brooding house at the 8 th week of age and pullets were moved to individual cages in laying house at 16 th week of age. A "step down-step up" lighting program was used durino-g brooding, rearing and production periods. Age at sexual maturity (ASM), body weight at sexual maturity (BWSM), body weight at maturity (BWM), egg weight at sexual maturity (EWSM), egg weight at maturity (EWM), egg number in first 90 days of laying (EN90d) and egg number till 42 weeks of age (EN42WK) were individually recorded for each laying hen. Results can be summarized as follows:1-In the first generation, Norfa layers had late ASM (193.15d), reasonable egg weights (37.99 and 46.11 g for EWSM and EWM, respectively) and low egg numbers (28.34 and 33.48 eggs for EN90d and EN42wk, respectively) with light body weights (979.70 and 1078.42 g for BWSM and BWM, respectively). 2-In the second generation, the overall average of ASM of Norfa females was 179.30 d. Average of BWSM was 919.25 g, while BWM recorded in the studied flock of Norfa layers equaled to 1073.71 g. The mean of EWSM was 32.0 g and the mean value of EWM was 45.62 g. Egg number means obtained in the second season were 39.0 and 48.02 eggs for EN90d and EN42wk, respectively.

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Estimation of Variance Components Based on Diallel Crosses of Four Lines of Norfa Chickens

Cited by 3 publications

References 0 publications

Estimation of Additive, Dominance and Heritability of Some Egg Production Traits in Egyptian Local Strains of Chicken

Estimation of Additive, Dominance and Heritability of Some Egg Production Traits in Egyptian Local Strains of Chicken

Improving Some Productive Traitsof Norfa Chickens Using Selection Index

Studies on Some Productive Traits in Norfa Chickens

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