Results 21 to 30 of about 4,776 (194)

Genetic variations for the eggshell crystal structure revealed by genome-wide association study in chickens

BMC Genomics, 2021
Background Eggshell is a bio-ceramic material comprising columnar calcite (CaCO3) crystals and organic proteinaceous matrix. The size, shape and orientation of the CaCO3 crystals influence the microstructural properties of chicken eggshells. However, the
Quanlin Li, Zhongyi Duan, Congjiao Sun, Jiangxia Zheng, Guiyun Xu, Ning Yang   +5 more
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Determination of hen eggshell stress by the puncture method [PDF]

Journal on Processing and Energy in Agriculture, 2021
The aim of this study was to design and apply the measuring acquisition system, or a device for determining the limit values of eggshell stress using the puncture method.
Koprivica Ranko, Veljković Biljana, Rakonjac Simeon, Božić Miloš, Vujičić Vojislav, Radivojević Dušan, Marković Dušan, Đokić Dragoslav   +7 more
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Factors Influencing Thickness of Eggshell

Poultry Science, 1928
Abstract The original work described in this paper was done as part of a project of the Kentucky Agricultural Experiment Station. In producing and handling market eggs, strong shells are desirable. Much of the loss through breakage, both on the farm and in transportation, is due to weak shells.
LEWIS W. TAYLOR, J. HOLMES MARTIN
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Effect of 25-hydroxyvitamin D and essential oil complex on productive performance, egg quality, and uterus antioxidant capacity of laying hens

Poultry Science, 2021
: This study was conducted to determine the effect of 25-hydroxyvitamin D (HDV) and essential oils (EO) on the uterus antioxidant capacity, egg quality, and eggshell ultrastructure in laying hens.
Pinyao Zhao, Lei Yan, Tao Zhang, Huadong Yin, Jingbo Liu, Jianping Wang   +5 more
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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.
W.E. FAGAN, D.J. BUCKLEY, C.P.W. TSANG
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Research Note: Changes in eggshell quality and microstructure related to hen age during a production cycle

Poultry Science, 2021
: We have studied in detail the changes that occur in eggshell structure and composition during a production cycle in order to better understand the deterioration of eggshell quality with hen age (at 33, 45, and 67 wk).
Cristina Benavides-Reyes, Elisa Folegatti, Nazaret Dominguez-Gasca, Gilberto Litta, Estefania Sanchez-Rodriguez, Alejandro B. Rodriguez-Navarro, Murtala Umar Faruk   +6 more
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Eggshell structure, measurements, and quality-affecting factors in laying hens: a review

Czech Journal of Animal Science, 2016
Eggshell quality is one of the most significant factors affecting poultry industry; it economically influences egg production and hatchability. Eggshell consists of shell membranes and the true shell that includes mammillary layer, palisade layer, and ...
M. Ketta, E. Tůmová
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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.
Lucyna, Kibala, Iwona, Rozempolska-Rucinska, Kornel, Kasperek, Grzegorz, Zieba, Marek, Lukaszewicz   +4 more
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Eggshell thickness and egg morphometrics in five songbird species from the Central Valley, California

Journal of Field Ornithology
Avian eggshell thickness is an important life history metric in birds and has broad applications across disciplines ranging from animal behavior to toxicology.
Carley R. Schacter, Sarah H. Peterson, C. Alex Hartman, Mark P. Herzog, Joshua T. Ackerman   +4 more
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The partial replacement of sodium chloride with sodium bicarbonate or sodium sulfate in laying hen diets improved laying performance, and eggshell quality and ultrastructure

Poultry Science, 2021
: This study investigated the effects of dietary chloride (Cl) reduction on laying performance and eggshell quality by substitution of sodium bicarbonate (NaHCO3) or sodium sulfate (Na2SO4) for part of dietary sodium chloride (NaCl), and further explored
Yu Fu, Jing Wang, Hai-jun Zhang, Shu-geng Wu, Jian-min Zhou, Guang-hai Qi   +5 more
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