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Ultrasonic eggshell thickness measurement for selection of layers
Poultry Science, 2015 This study aimed to develop a methodology for using ultrasonic technology (USG) to record eggshell thickness for selection of layers. Genetic correlations between eggshell strength and its thickness have been reported to be around 0.8, making shell thickness a selection index candidate element.
Iwona Rozempolska-Rucińska +2 more
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Dieldrin and Eggshell Thickness in Ducks
Nature, 1969CHLORINATED hydrocarbons may cause reproductive failure in several vertebrate species, and their presence seems to be related to the eggshell quality of birds. Raptors in Britain, including the peregrine (Falco peregrinus), sparrow hawk (Accipiter nisus) and golden eagle (Aquila chrysaetos), have reproduced less successfully with the increased use of ...
P N, Lehner, A, Egbert
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Research Note: Electronic Eggshell Thickness Gauge
Poultry Science, 1988 Abstract An electronic gauge that increases the speed and ease of measuring eggshell thickness is described. The performance of the electronic gauge was compared with that of more conventional methods (visual and mechanical) of thickness measurements.
D J Buckley
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WHY PENGUIN EGGSHELLS ARE THICK
The Auk, 2004Abstract Like most other penguin species, Magellanic Penguins (Spheniscus magellanicus) are large-bodied birds that incubate their eggs for a prolonged period on hard substrates with little nesting material—all circumstances that could lead to high rates of egg breakage. However, Magellanic Penguin eggs at Punta Tombo, Argentina are seldom broken. From
P. Dee Boersma +2 more
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Methyl mercury: Its effect on eggshell thickness
Bulletin of Environmental Contamination and Toxicology, 1972The authors have examined the effect of mono- and di-methyl mercury on the shell thickness of two species, the Ring Dove (Streptopelia risoria) and American Kestrel (Falco sparverius). Two clutches (two eggs each) were collected from each pair of doves before the administration of mercury.
D B, Peakall, J L, Lincer
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Impact of cuticle quality and eggshell thickness on egg antibacterial efficiency
Poultry Science, 2019 The cuticle is the first barrier against bacterial trans-shell penetration. To evaluate the cuticle quality among different colored eggshells, an efficient and reliable method is proposed in this paper on the basis of the opacity theory. It is shown that the Spearman's rank correlation coefficients between the proposed opacity method and the reported ...
Ning Yang, Jianlou Song, Jiangxia Zheng
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Journal of Field Ornithology, 2010 The study of avian eggshell structure, including composition, pigmentation, thickness, and strength, has important ecological and economic implications. Previous investigators have used a variety of techniques to derive either direct measures or indirect
Pankaj Kumar Choudhary +2 more
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Shifts in eggshell thickness are related to changes in locomotor ecology in dinosaurs
Evolution, 2021Birds share an array of unique characteristics among extant land vertebrates. Among these, external and microstructural characteristics of extant bird eggs have been linked to changes in reproductive strategy that arose among non-avian theropod dinosaurs. More recently, differences in egg proportions recovered in crown birds relative to other dinosaurs
Lucas J. Legendre, Julia A. Clarke
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Thickness of the American woodcock eggshell, 1971
Bulletin of Environmental Contamination and Toxicology, 1973Eggs or empty shells of the American woodcock were collected from 10 states in 1971 and shell thickness (mean of clutch means) was compared with that of eggs collected from 16 states during the years 1859–1939. The 1971 shells (n=91) from hatched eggs or those containing fully developed embryos were about 10 percent thinner ...
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The effect of developmental stage on eggshell thickness variation in endangered falcons [PDF]
Zoology, 2010 We compared eggshell thickness of hatched eggs with that of non-developed eggs in endangered falcon taxa to explore the effect of embryo development on eggshell thinning. To our knowledge, this has never been examined before in falcons, despite the fact that eggshell thinning due to pollutants and environmental contamination is often considered the ...
Juan J. Negro +2 more
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