A morphometric method of sexing white layer eggs

Yilmaz-Dıkmen, B.; Dikmen, Serdal

doi:10.1590/s1516-635x2013000300006

Cited by 24 publications

(26 citation statements)

References 32 publications

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“…In both flocks, male chicks were slightly heavier than the female. In general, our results are to a large extent compatible with results obtained by [27,28] and even [24]. Narushin [24] reports an average egg shape index of 75.20% (69.70−80.10%) and egg volume of 60.19 cm 3 (52.00−70.40 cm 3 ) of eggs laid by the 65-week-old Hy-Line Brown hens, regardless of the chick sex.…”

Section: Effects Of Morphometric Indicators On Incubation Values Of Esupporting

confidence: 92%

“…Results obtained in our research partly correspond with conclusions of previous authors who primarily studied different genotypes of broiler parents. Research most similar to ours was conducted by [27] with one of the aims to determine chick's potential sex before egg incubation (Super Nick White Layer) using morphometric measurements of eggs (weight, length, width, shape index, volume). Their conclusion is that length, width, shape index, and volume before incubation period have certain effect on the future chick sex, especially egg shape index and egg width and length.…”

Section: Effects Of Morphometric Indicators On Incubation Values Of Ementioning

confidence: 99%

“…Apart from the abovementioned authors [16,17], research studying effects of nongenetic factors on the quality of hatching eggs and on incubation results and the quality of hatched chicks of male and female one-day chicks of the parent flocks of different breeds and light line hybrids was conducted by [5,[23][24][25][26][27][28], as well as [29,30]. Similar research, but in case of the wild/nondomesticated birds (sparrow-Passer, falcon-Falco, northern lapwing-Vanellus vanellus), was conducted by [31][32][33].…”

Section: Introductionmentioning

confidence: 99%

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Effects of Morphometric Indicators on Incubation Values of Eggs and Sex of the Chicks of the Light Hen Hybrids

Milojevic¹,

Jokić²,

Mitrovic³

2020

Animal Models in Medicine and Biology

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The aim of this study was to establish incubation values of eggs (egg fertilization, absolute and relative embryo mortality, and hatchability of male and female chicks), morphometric indicators (preincubation egg mass; length, width, and egg shape index; hatched female and male chicken mass and their relative share in the egg mass before incubation), and the phenotype correlation between some traits in the younger parent flock (YF 33-33 weeks) and the older flock (OF 49-49 weeks) of the light Institut de Sélection Animale (ISA) Brown hybrid. With regard to incubation values, the younger flock (YF 33) demonstrated better incubation results than the older flock (OF 49). The egg fertilization rate was 95.24 and 94.22%, respectively, chick hatchability as the percentage of the total of incubated eggs was 86.51 and 84.89%, respectively, and chick hatchability as the percentage of the total of fertilized eggs was 90.83 and 90.09%, respectively. Embryo mortality rate was 8.73 and 9.17% (YF 33), and 9.33 and 9.91% (OF 49). Regardless of the parent flock age, eggs that hatched female chicks had lower values of observed morphometric traits than those that hatched male chicks, except for the egg shape index (77.49-77.47%, respectively) which was higher by 0.02% in eggs which hatched female chicks, but this difference was not statistically significant (P > 0.05). Contrary to effects of the chick sex, the parent flock age had considerably larger effect on observed morphometric traits, as all morphometric indicators of eggs and hatched chicks of both sexes in the older flock (OF 59) had statistically significantly higher values (P < 0.001) than in the younger flock (YF 33). The only exception is the relative share of the chicken in the egg mass where the measured difference (−0.03%) was not statistically significant (P > 0.05). The phenotype correlation coefficients determined (r p) between the egg mass before the incubation period and the egg shape index were statistically significant (P < 0.01; P < 0001), except between the egg mass of eggs which hatched female chicks and the egg shape index in the young flock (YF 33), whereby the calculated coefficient (r xy = 0.107) was not statistically confirmed (P > 0.05). Furthermore, the egg mass and hatched chicken mass of both sexes increased with the age of the parent flock, and statistically significant absolute phenotype correlation (P < 0.001) was determined between these two indicators.

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Section: Effects Of Morphometric Indicators On Incubation Values Of Esupporting

confidence: 92%

Section: Effects Of Morphometric Indicators On Incubation Values Of Ementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of Morphometric Indicators on Incubation Values of Eggs and Sex of the Chicks of the Light Hen Hybrids

Milojevic¹,

Jokić²,

Mitrovic³

2020

Animal Models in Medicine and Biology

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“…The relationship between and the influence of egg measurements on the determination of chicken sex has been reported on only a few occasions in literature. Yilmaz-Dikmen and Dikmen [58], reported the effects of egg shape index (p = 0.001), egg length (p = 0.0018), egg width (p < 0.01), and volume (p = 0.004) of the egg had a significant effect on the sex of hatching chick of Super Nick White Layers. This could have been expected as the mathematical methods to compute egg shape index or egg volume reported in literature widely depend on egg width and length parameters.…”

Section: Discussionmentioning

confidence: 96%

“…This could have been expected as the mathematical methods to compute egg shape index or egg volume reported in literature widely depend on egg width and length parameters. In particular, egg volume has been reported to be significantly different between males and females in some avian species [35,58]. For example, using molecular techniques, house sparrow eggs containing male embryos were reported to be significantly larger than those containing female embryos, considering they are laid randomly with respect to laying order [34].…”

Section: Discussionmentioning

confidence: 99%

Sexual Dimorphism for Coping Styles Complements Traditional Methods for Sex Determination in a Multivariety Endangered Hen Breed

Pastrana

González

Navas

et al. 2019

Animals

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Sex determination is key to designing endangered poultry population conservation and breeding programs when sex distribution departs from Hardy–Weinberg equilibrium. A total of 112 Utrerana chickens (28 per variety, partridge, black, white, and franciscan) were selected for hatching day sexing. Sex assignation was performed through 10 methods. Three sex assignment criteria comprised criteria found in literature, opposite criteria to that in the literature, and composite criteria combining methods reporting the highest predictive success from the previous ones. This study aims to determine which method combinations may more successfully determine sex across the four varieties of Utrerana endangered hen breed to tailor noninvasive early specific models to determine sex in local chicken populations. Although the explanatory power of the three assignation criteria is equal (75%), assignation criteria 2 resulted to be the most efficient as it correctly assigns males more frequently. Only methods 3 (English method), 5 (general down feathers coloration), 7 (wing fan), and 10 (behavior/coping styles) reported significant differences regardless of the variety, hence, are appropriate for early sexing. Sex confirmation was performed at 1.5 months old. Identifying sex proportions enhances genetic management tasks in endangered populations, complementing more standardized techniques, which may result inefficient given the implicit diversity found in local populations.

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