Selection for egg shell strength in laying hens using shell membrane characteristics

Johansson, Kjell; Örberg, Jan; Carlgren, A.-B.; Wilhelmson, Martin

doi:10.1080/00071669608417905

Cited by 12 publications

(6 citation statements)

References 9 publications

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“…Farzin et al (2006) reported a heritability estimate for shell thickness of 0Á68 in laying hens. This coincides with the results from the present study, but both estimates are higher than the heritability of 0Á33 reported by Johansson et al (1996). The h 2 estimates for WL21 and WL35 corresponded with findings from Brand et al (2009).…”

Section: Discussionsupporting

confidence: 92%

Genetic parameters for eggshell traits in ostriches

Brand

Cloete

Malecki

et al. 2012

British Poultry Science

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1. A study was conducted on ~14000 ostrich eggs to estimate genetic parameters for eggshell traits that could benefit the hatchability of ostrich eggs. Traits measured included the number of pores on the eggshell, the average diameter of these pores, the total area of pores on the eggshell, permeability (pore area/shell thickness) and eggshell thickness. 2. Heritability estimates ranged from 0·16 for total pore area to 0·41 for the natural logarithm of pore count. The heritability estimates for water loss on 21 and 35 d (WL21 and WL35) of incubation were high at 0·23 and 0·24, respectively. 3. On a genetic level, pore count was negatively correlated with average pore diameter (-0·73) and shell thickness (-0·28), whereas it was positively correlated with total pore area (0·58), WL21 (0·24) and WL35 (0·34). The direct and maternal genetic correlations of pore count with total pore area (0·58) and permeability (0·59) were high and significant. Permeability was positively correlated to WL21 and WL35, both on the direct and maternal genetic levels. 4. The estimated genetic parameters indicate that it should be possible to select for the various eggshell traits in ostrich eggs, or for permeability and water loss. However, as a trait with an intermediate optimum, direct selection for permeability and other eggshell traits would not be straightforward, and the possible application of these results to improve hatchability of ostrich eggs in the future needs consideration.

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Section: Discussionsupporting

confidence: 92%

Genetic parameters for eggshell traits in ostriches

Brand

Cloete

Malecki

et al. 2012

British Poultry Science

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“…Similarly, the correlations between shortening force at fracture of egg, strength of eggshell and ratio of cracked eggs, eggs without shell and abnormal eggs to total number of eggs were negative, too. Thus, testing of shortening force at fracture and strength of eggshell can be used (in agreement with JOHANSSON et al, 1996) in selection for egg quality within laying lines on hens.…”

Section: Discussionmentioning

confidence: 94%

“…On the contrary, BRAH et al (1992) found no significant antagonistic relationship with body weight, egg number and egg weight. JOHANSSON et al (1996) studied the possibility of increase of eggshell strength by means of selection. They carried out divergent selection for attachment strength and they suggested the possibility of improving shell strength in laying hens by selecting for increased attachment strength.…”

Section: Zusammenfassungmentioning

confidence: 99%

The relationship of shortening and strength of eggshell to some egg quality indicators and egg production in hens of different initial laying lines*

Máchal

Simeonovová

2002

Arch. Anim. Breed.

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Abstract. The mean values of shortening force at fracture of egg found out during the five-month observation period ranged between 0.17 and 0.19 mm in 231 hens of seven initial laying lines and strength of eggshell ranged from 29.05 N to 36.46 N. The mean values of shortening force at fracture decreased with age of hens from 0.18–0.22 mm at 28 wk of age to 0.12–0.15 mm at 46 wk of age. Similarly, strength of eggshell decreased from 31.35–37.68 N to 27.91–34.50 N in same time period. Index of shape, ratio of eggshell and albumen to total egg weight also decreased with increasing age of hens. The highest ratio of abnormal eggs was found in both Bar Plymouth Rock lines (BPR A and BPR B) – 7.5% and 8.3% resp. The lowest ratio was found in lines Rhode Island Red (RIR C) – 2.1% and Susex Light (SU) – 2.4 %. The ratio of cracked eggs ranged from 0.9 % to 3.9 %, the ratio of double-yolked eggs was 0.5%–3.2% and the ratio of eggs without shell was 0.4 %–1.5 %. The calculated coefficients of correlation between shortening of egg and index of shape were mainly positive with rp = 0.41 (P < 0.05) and rp = 0.49 (P < 0.01). The correlations between shortening of egg and total number of eggs were mainly negative with rp = −0. 34 (P < 0.05) and rp = −0. 46 (P < 0.01). Similar correlations existed also between shortening of egg and ratio of cracked eggs, i.e. rp = −0. 44 (P < 0.05) and rp = −0. 46 (P < 0.01). The correlations between shortening and total number of abnormal eggs were mainly negative rp = −0. 39 (P < 0.05) and rp = −0. 53 (P < 0.01). The relationships between strength of eggshell and shortening of egg are characterized by positive correlations – rp = 0. 40 (P < 0.05) and rp = 0.55, (P < 0.01). Positive correlations existed also between strength of eggshell and index of shape (from rp = 0. 37 (P < 0.05) to rp = 0.59 (P < 0.01)). Correlations between strength of eggshell and ratio of eggshell ranged from rp = 0.44 (P < 0.01) to rp = 0.74 (P < 0.01). Mainly negative correlations were found out between strength of eggshell and number of eggs rp = −0. 34 (P<0.05) and rp = −0. 44 (P < 0.01), similarly between the strength of eggshell and cracked eggs rp = −0. 40 (P < 0.05) and rp = −0. 52 (P < 0.01). Negative correlations existed between strength of eggshell and total number of abnormal eggs (rp = −0.45 to rp = −0.53 (P < 0.01)). This means that both eggshell shortening and strength may be used when selecting lines for egg quality.

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“…(9) and Zhang et al(39) in the different breeds. Johansson et al(12) and Besbes and Gibson (8) estimated heritability as moderate to high values (0.23 to 0.41) for egg shape index. A moderate heritability estimation (0.33) for shape index was consistent with the estimates reported by Johansson et al(12) andBesbes and Gibson (8).…”

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confidence: 99%

Estimation of genetic parameters for some performance traits in a selected Barred Rock line

Kamanli¹

2019

Ankara Üniversitesi Veteriner Fakültesi Dergisi

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This study was conducted to determine the genetic correlation and heritability for age at sexual maturity, body weight at sexual maturity, egg yield, egg weight, egg shape index and L*, a*, b* values of egg shell in a Barred Rock line was applied selection. For this aim, a total of 1622 pedigreed Barred Rocks were selected. The present estimated heritability values for investigated traits were found between moderate-to-high. However, the heritability of egg yield, eggshell color and body weight at sexual maturity were found lower than those of other traits. It was calculated positive correlations among monthly egg yields, especially between egg yield at the second month with total egg yield. As a conclusion, selection studies did not cause much decrease in genetic variation of studied traits, except for egg yield and body weight at sexual maturity. Monthly egg yield data can be used selection studies.

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Selection for egg shell strength in laying hens using shell membrane characteristics

Cited by 12 publications

References 9 publications

Genetic parameters for eggshell traits in ostriches

Genetic parameters for eggshell traits in ostriches

The relationship of shortening and strength of eggshell to some egg quality indicators and egg production in hens of different initial laying lines*

Estimation of genetic parameters for some performance traits in a selected Barred Rock line

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