caa a22 4500 397569394 CHVBK 20180308164837.0 cr unu---uuuuu 161202e199605 xx s 000 0 eng 10.3382/ps.0750656 doi (NATIONALLICENCE)oxford-10.3382/ps.0750656 Relationship of Eggshell Ultrastructure and Shell Strength to the Soundness of Shell Eggs [Elektronische Daten] [K. M. CARNARIUS, K. M. CONRAD, M. G. MAST, J. H. MACNEIL] Factors affecting the soundness of shell eggs are of primary concern to egg processors due to substantial financial losses from cracked and leaker eggs. Ultrastructural analyses were used to examine the palisade layer width and mammillary knob layer thickness of sound, cracked, and leaker eggshells. Subjective observations were also made. There was no significant difference (P > 0.05) in the width of the palisade layer or the mammillary knob layer among sound, cracked, and leaker eggshells. The eggshell strengths of sound, cracked, and leaker eggs were evaluated using puncture force and shell thickness measurements. Sound eggshells were found to have a significantly (P < 0.05) higher mean puncture force (35.3 N) than cracked (30.4 N) and leaker (28.4 N) eggshells. The mean puncture force values for cracked and leaker eggshells were not significantly different from each other (P > 0.05). Regression and correlation analyses indicated a significant correlation (P < 0.01; r = 0.61) between palisade layer width and puncture force. The mean shell thickness values for cracked (0.36 mm) and leaker (0.35 mm) eggs were significantly lower (P < 0.05) than those of sound eggs (0.38 mm), although cracked and leaker eggshell thickness did not differ significantly (P > 0.05). The correlation coefficient between puncture force and shell thickness was significant (P < 0.01; r = 0.56), indicating a possible relationship. © 1996 Poultry Science Association, Inc. Processing and Products nationallicence eggshell ultrastructure nationallicence eggshell strength nationallicence eggshell thickness nationallicence egg quality nationallicence CARNARIUS K. M. aut CONRAD K. M. aut MAST M. G. aut MACNEIL J. H. 2To whom correspondence should be addressed. aut Poultry Science Oxford University Press 75/5(1996-05), 656-663 0032-5791 75:5<656 1996 75 ps https://doi.org/10.3382/ps.0750656 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.3382/ps.0750656 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- CARNARIUS K. M. aut NATIONALLICENCE 700 1- CONRAD K. M. aut NATIONALLICENCE 700 1- MAST M. G. aut NATIONALLICENCE 700 1- MACNEIL J. H. 2To whom correspondence should be addressed aut NATIONALLICENCE 773 0- Poultry Science Oxford University Press 75/5(1996-05), 656-663 0032-5791 75:5<656 1996 75 ps Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford