Results 51 to 60 of about 7,706 (157)

Eggshell spottiness reflects maternally transferred antibodies in blue tits. [PDF]

PLoS ONE, 2012
Blue-green and brown-spotted eggshells in birds have been proposed as sexual signals of female physiological condition and egg quality, reflecting maternal investment in the egg. Testing this hypothesis requires linking eggshell coloration to egg content,
Marie-Jeanne Holveck, Arnaud Grégoire, Vincent Staszewski, Romain Guerreiro, Philippe Perret, Thierry Boulinier, Claire Doutrelant   +6 more
doaj   +1 more source

Eggshell pigmentation in the blue tit: male quality matters

Behavioral Ecology and Sociobiology, 2017
This study was funded by projects CGL2012-40026-C02-01 to SM and CGL2012-40026-C02-02 to JM from the MEC (Ministerio de Economia y Competitividad). EPB was supported by a JAE grant from the Spanish National Research Council (CSIC).
Badás, EP, Martínez, J, Rivero-de Aguilar, J, Stevens, M, van der Velde, M, Komdeur, J, Merino, S   +6 more
openaire   +5 more sources

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
doaj   +1 more source

Effects of Eggshell Quality and Broiler Breeder Age on Hatchability

Poultry Science, 1994
The effects of eggshell quality and breeder age were assessed on egg weight loss during incubation, fertility, hatchability, and embryonic mortality. The trials involved hatching eggs from three commercial broiler breeder flocks of the same strain but of different ages. The eggs were divided according to specific gravity into two groups, thin-shelled (<
L, Roque, M C, Soares
openaire   +2 more sources

A Study on the Relationship Between Eggshell Color and Eggshell Quality in Commercial Broiler Breeders

International Journal of Poultry Science, 2008
In this experiment, two trials were conducted to determine whether broiler breeder eggshell color could be used as an easy means of predicted eggshell quality. In Trial 1, 4320 commercial broiler breeder eggs were obtained. Specific gravity (SG) was measured and color determined on the eggs on the day of lay.
D.R. Ingram, L.F. Hatten III, K.D. Homan
openaire   +1 more source

Improving eggshell quality at high temperatures with dietary sodium bicarbonate

Poultry Science, 1997
Two experiments were conducted that confirmed the hypothesis that a dietary bicarbonate supplement will improve eggshell quality in hens at high temperatures as long as feed is consumed during the period of eggshell formation. End-of-lay hens were maintained on continuous light at temperatures of 30 and 35 C.
D, Balnave, S K, Muheereza
openaire   +2 more sources

Effect of housing system and age of laying hens on eggshell quality, microbial contamination, and penetration of microorganisms into eggs

Czech Journal of Animal Science, 2018
Hens of the laying hybrid ISA Brown were used in the study with the objective to evaluate eggshell quality, microbial contamination of eggshells, and penetration of microorganisms into the egg content in different housing systems (enriched cage: 60 hens,
Jana Vlčková, Eva Tůmová, Mohamed Ketta, Michaela Englmaierová, Darina Chodová   +4 more
doaj   +1 more source

Productive performance, eggshell quality, and eggshell ultrastructure of laying hens fed diets supplemented with organic trace minerals

Poultry Science, 2014
This study was carried out with the purpose of evaluating the effect of supplementing hens' diets with trace minerals from inorganic or organic sources on the productive performance, eggshell quality, and eggshell ultrastructure of laying hens. Three hundred sixty Hy-Line W36 laying hens between 47 to 62 wk of age were used and distributed in a ...
C, Stefanello, T C, Santos, A E, Murakami, E N, Martins, T C, Carneiro   +4 more
openaire   +2 more sources

Sodium chloride concentration in drinking water and eggshell quality

Poultry Science, 1998
Two experiments with White Leghorn hens (36 and 49 wk old, respectively) were conducted to examine the effects of varying NaCl concentrations provided through drinking water upon eggshell quality. Experiments were of 6 and 5 wk duration, respectively. Seven replicate pens of five individually caged hens received each water treatment.
openaire   +2 more sources

Effects of manganese glycine on eggshell quality, eggshell ultrastructure, and elemental deposition in aged laying hens

animal
Poor eggshell quality of eggs laid by aged laying hens is the major problem affecting the length of the rearing period in the laying hen industry. Trace elements are required and play vital roles in the eggshell quality of laying hens. Appropriate dose of organic microelements is environmentally friendly and sufficient to satisfy the needs of hens ...
J. Lu, D.C. Jiang, M. Ma, Q. Wang, J. Guo, X.G. Wang, T.C. Dou, Y.F. Li, Y.P. Hu, K.H. Wang, L. Qu   +10 more
openaire   +3 more sources