| 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
|
| Holdings |
| Library |
Call Number |
Additional Info |
Location |
Last
Modified |
Checkout
Status |
| 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 |
