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Main Title Comparison of Breaking Strength and Shell Thickness as Evaluators of Eggshell Quality.
Author Bennett, J. K. ; Ringer, R. K. ; Bennett, R. S. ; Williams, B. A. ; Humphrey, P. E. ;
CORP Author Corvallis Environmental Research Lab., OR. ;Northrop Services, Inc., Corvallis, OR. ;Michigan State Univ., East Lansing. ;Oregon State Univ., Corvallis. Dept. of Forest Products.
Publisher c1988
Year Published 1988
Report Number EPA/600/J-88/301;
Stock Number PB89-202352
Additional Subjects Birds ; Sulfanilamide ; Toxicity ; Thickness ; Sulfur organic compounds ; Breaking strength ; Reprints ; Eggshells ; Bobwhite quail ; Biological effects ; Colinus Virginianus
Library Call Number Additional Info Location Last
NTIS  PB89-202352 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 10p
Abstract The shell quality of eggs produced by northern bobwhite (Colinus Virginianus) dosed with sulfanilamide was evaluated by a compression breaking strength test and by the shell thickness measurements that are used in the U.S. Environmental Protection Agency avian reproduction test to determine the effect of a chemical substance on eggshells. The relative sensitivities of the two methods in detecting shell quality changes in sulfanilamide-treated quail were compared by relative response ratios, calculated as treatment period response divided by pretreatment values. The ratios demonstrated a clear shell weakening response and a less apparent shell thinning response. Significant differences in shell thickness of eggs from sulfanilamide-treated hens and those from control hens were not demonstrated (alpha = 0.32 and 0.34), although highly significant differences in shell strength were demonstrated (alpha <0.0001). Scanning electron micrographs of weak shells of normal thickness revealed abnormal ultrastructure, usually poorly formed mammillae. Obtaining both shell thickness and shell strength information may provide better means to evaluate a chemical's effect on shell quality.
Supplementary Notes Pub. in Environmental Toxicology and Chemistry, v7 p351-357 1988. Prepared in cooperation with Northrop Services, Inc., Corvallis, OR., Michigan State Univ., East Lansing, and Oregon State Univ., Corvallis. Dept. of Forest Products.
NTIS Title Notes Journal article.
Title Annotations Reprint: Comparison of Breaking Strength and Shell Thickness as Evaluators of Eggshell Quality.
Category Codes 57Y; 57Z; 98E
NTIS Prices PC A02/MF A01
Primary Description 600/02
Document Type NT
Cataloging Source NTIS/MT
Control Number 925821648
Origin NTIS
Type CAT