Abstract A comparative study on eggshell powder and commercially available CaCO 3 has been conducted. The Raman spectra of show the bands calcite phase. However, are more intense than conventional . peaks also some blue shift, which indicates that phase is sensitive Additionally, exhibits extra aragonite photoluminescence a narrow band merged used This eggshells could be good pure alternative f...

With respect to the problem that it is difficult to pick out eggs with small cracks, a novel vibrating type of eggshell cracks detection system using a magnetostrictive transducer was developed firstly. Then the acoustic signals was recorded while the transducer vibrating with the swept frequency from 1 to 14000 Hz. Thirdly, the wavelet and Burg power spectrum were used for data pretreatment an...

Carefully controlled gas exchange across the eggshell is essential for the development of the avian embryo. Water vapour conductance (G(H2O)) across the shell, typically measured as mass loss during incubation, has been demonstrated to optimally ensure the healthy development of the embryo while avoiding desiccation. Accordingly, eggs exposed to sub-optimal gas exchange have reduced hatching su...

A 10 wk trial was conducted to investigate the effect of using ground, sterilized eggshell as a calcium source in the diet of laying hens. Egg production, egg and eggshell quality, hatching characteristics and eggshell ultrastructure were evaluated. A total of 144 hens aged 25 wk were housed in floor pens, located in a conventional open-sided layer shed. The birds were randomly divided into thr...