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Although both body weight and ML of early incubation groups EI and EMI were slightly higher than those of late incubation groups LI and LMI , post-hatch growth and leg bone development was not altered by the manipulation of egg redistribution. The aim of this study was to investigate the effects of egg redistribution during incubation on hatching time and post-hatch development. The results demonstrate that mixing eggs of different developmental stages during incubation influenced the hatching process, including delayed hatching time and shortened hatch window.

They also suggest that embryonic development and post-hatch performance were not altered by the egg redistribution on BA 12 days of LI. The hatching time is known to be influenced by factors such as parental age, egg storage time and conditions, and incubation conditions Careghi et al.

The hatching time distribution also results in different chick qualities and physiological characteristics of one batch of hatched chicks Careghi et al. To eliminate these factors, the eggs were obtained from a single breeder flock, laid on the same day, stored with very short time no more than two days , and incubated in incubators with temperature and relative humidity calibration. Thus, the manipulation of egg redistribution on day 12 was presumed to be the only factor that affects the hatching time in this study.

The onset of the hatching process of redistributed eggs was retarded 5—6 h, indicating that the narrow hatch window was related to the delay of the first hatch in manipulated group. This might be explained by some kind of egg communication between early incubated eggs and late incubated eggs. Specific interaction among the redistributed eggs may take place after mixing eggs, by means of embryo sound communication. Perception of vocalizations by embryos may lead to physiological or behavioral changes.

This is consistent with the finding of Tong et al. However, increased mortality was observed in duck and chicken eggs that were incubated under artificial sound stimulation Tong et al.

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Compared to the artificial sound stimulation, embryo vocalization may impose less stress on other hatching eggs and exerts no negative impact on hatchability. Another hypothesis is that environmental CO 2 alters the hatch process and results in a narrow spread of hatch. Previous researchers reported that high levels of CO 2 during the early stages of incubation stimulated early hatching and shortened hatch window De Smit et al.

Although the onset of hatching process of mixed eggs was delayed compared to the control groups, this did not extend the spread of hatch. The early incubated embryos may penetrate the membrane and eggshell, and generate more CO 2 during the hatching period, leading to increased CO 2 concentration that stimulated the hatching process of late incubated eggs. Furthermore, increasing the CO 2 concentration potentially contributes to the hatchability of LMI Considering this delayed onset of the hatching process, the narrow spread of hatch and the increased hatchability, our future work will focus on identifying to what degree, and via which mechanisms, redistributing eggs of different growth curves affects hatching pattern and hatchability.

The advanced embryonic development of early incubated eggs was observed in both control EI and manipulated group EMI , mainly caused by the initial incubation time difference of 12 h. However, mixing eggs of different growth curves did not alter the embryonic growth and yolk absorption before hatch.

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Chick embryos of both early incubated and late incubated eggs were able to maintain normal organ development and nutrient metabolism until hatch. The consistency of body weight and leg bone development on day 7 was observed as expected. Nevertheless, the narrow hatch window of manipulated groups did not influence chick growth performance up to day 7, indicating that egg distribution only stimulates the hatching behavior.

However, there is no evidence that response to eggs or egg communication by egg distribution was related to this shortened hatch window. As reported above, there was no negative effect of mixing eggs of different growth curves on embryonic growth, utilization of nutrients and post-hatch performance. The specific manipulation of mixing eggs of different initial incubation time influenced the hatching pattern of late incubated eggs, including advanced hatching process and narrow hatch window, but did not affect normal embryonic development, utilization of nutrients and post-hatch performance of the late incubated eggs.

All of these results are applicable in the industrial hatchery to shorten hatch window and improve the uniformity of chicks. Common use cases Typos, corrections needed, missing information, abuse, etc. Our promise PeerJ promises to address all issues as quickly and professionally as possible. We thank you in advance for your patience and understanding. You can also choose to receive updates via daily or weekly email digests. If you are following multiple publications then we will send you no more than one email per day or week based on your preferences.

Note: You are now also subscribed to the subject areas of this publication and will receive updates in the daily or weekly email digests if turned on. Potential selective pressure factors that might explain the change in the hatching mechanism could theoretically include temporal or spatial constraints in embryonic development, as well as changes in oviposition ecology or pattern.


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The present fossil assemblage corresponds to a recently hatched egg lay. Indeed, the morphological and taphonomic data noted above indicates that the neonates of Tragichrysa ovoruptora were caught together by resin while clutching the eggs from whence they had freshly emerged Fig. The preservation as syninclusions of conspecific neonates, longitudinally split chorions, and serrated EBs bearing a short anterior process represents direct evidence of the late embryos of T. This finding demonstrates a c. Instead, such bradytely may reflect the early evolution of a successful life strategy not being altered in the succeeding eons.

The evolutionary history of egg bursters within and across metazoan groups is complex and largely unknown. Further embryological studies are still required to gain a deeper understanding on the true diversity and variability of egg bursters in the extant fauna, but, above all, increased and targeted palaeontological efforts are needed to detect these ephemeral hatching structures on eggs, embryos and early immature stages from extinct taxa. Thanks are due to an anonymous reviewer for helpful comments.

Statements and viewpoints expressed herein do not necessarily reflect the opinion of NSF. Volume 62 , Issue 4. If you do not receive an email within 10 minutes, your email address may not be registered, and you may need to create a new Wiley Online Library account. If the address matches an existing account you will receive an email with instructions to retrieve your username.

Palaeontology Volume 62, Issue 4. Original Article Open Access. Michael S. Engel E-mail address: msengel ku. Dany Azar E-mail address: danyazar ul. Tools Request permission Export citation Add to favorites Track citation. Share Give access Share full text access.

The Hatching by Ezekiel Boone | Penguin Random House Canada

Share full text access. Please review our Terms and Conditions of Use and check box below to share full-text version of article. Abstract Hatching is a pivotal moment in the life of most animals. LSID urn:lsid:zoobank. Type species Tragichrysa ovoruptora sp. Diagnosis immature, first instar Cephalic capsule subsemicircular.

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Tragichrysa ovoruptora sp. Egg remains are depicted in grey and each is marked with an asterisk. Figure 2 Open in figure viewer PowerPoint. Scale bar represents 0. Figure 3 Open in figure viewer PowerPoint. Egg remains associated with Tragichrysa ovoruptora gen. Black arrows indicate the anterior process of the egg burster from its anterior serrated edge. B, same as A but seen from the opposite side. E, detail of first egg burster shown in C, in ventrolateral view. F, detail of second egg burster shown in C, in dorsolateral view; note the dorsal serrations. Scale bars represent: 0.

Figure 4 Open in figure viewer PowerPoint. Morphological details of Tragichrysa ovoruptora gen. Abbreviations : ant, antenna; man, mandible; max, maxilla; pal, labial palp; ste, stemmata eyes. Figure 5 Open in figure viewer PowerPoint. Reconstruction of two Tragichrysa ovoruptora gen.

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This behaviour typically occurs in modern green lacewing neonates while their cuticle hardens and mouthparts become functional. Note that the presence of egg stalks, almost universal in extant chrysopids, remains speculative in the new extinct species as it cannot be determined from the present fossils. Colouration is conjectural and based on modern forms. Diagnosis immature, first instar As for genus see above.

Description First instar larva. Figure 6 Open in figure viewer PowerPoint. Occurrence of egg bursters EBs across Metazoa, with emphasis on insects and, more particularly, lacewings and relatives neuropterids, bottom. Thick coloured line indicates the presence of an EB in deep time supported by the fossil record. Question marks show groups in which the presence of an EB is unknown. Paraphyletic groups are shown between quotation marks. If British legislation on farm animal welfare…. Andy Schneider, the Chicken Whisperer discusses how backyard poultry keepers can keep their flocks safe during outbreaks of virulent Newcastle disease.

Below we provide two key elements that will help you get the most out of your hatchers. Adapt your incubation programme according to the timing of transfer Ideally, egg transfer from setter to hatcher is organised at day The simplified graph below shows key changes in the required environmental conditions. Load only eggs from the same flock and age, with the same storage time and coming from a balanced setter For different types of flock, ages and storage time, the overall profile as shown above will shift, and the intermediate durations and peaks will differ.

References: Vince M.