pounds to tlu' acre, hut only four piiirs sin\i\ecl: 

 survival time in the pens-was approximately equal 

 to birds fed 50 or 100 p. p.m. All four of the 

 surviving hens produced eggs, and a lotal of I'.) 

 chicks was hatched from the two successful nests. 

 Mortality rates and survival time for birds in pens 

 treated with 0.25 pound to the acre were similar 

 to those of quail fed diets containing 10 or 25 

 p. p.m. of heptachlor. Six of the 18 pairs lived and 

 produced a total of 24 chicks from three successful 

 nests. Five out of 10 ])airs in the untreated pens 

 survived and produced 21 chicks from three nests. 

 Pesticide residues in aninud tisniicx. — Kesidues 

 of DDT, heptachlor, dieldrin, or (oxaphene were 

 found in approximately 70 percent of the 590 

 specimens analyzed at Patu.xent during l!)r)2. Of 

 the 26 bald eagles examined, 25 contained residues 

 of DDT in amounts rauiring from traces in one or 



more organs to concentral ions comparaiile to t hose 

 found in experimentally do.sed birds which tlied of 

 DDT poisoning. Three eagle eggs, taken fioiii 

 unsuccessful nests after abnormally long incuba- 

 tion periods, also contained relatively high con- 

 centrations of DDT. 



Pesticide projects at the Denver Center. — Con- 

 siderable progress was made in 1962 in acquiring 

 and training new personnel, and in extending 

 physical facilities for chemical and biological in- 

 vestigations in determination of pesticide effects 

 on resident and migratory wildlife in western 

 United States. 



Added facilities include new chemical labora- 

 tory space and acquisition of a licjuid scintillation 

 spectrometer, permitting the use of radioactive 

 pesticides containing carbon 14 for evaluating the 

 accuracy of analytical methods in detei-mining ( 1 ) 



"^^S^S^i^Jii^P^S^Jf "T^i'S^^" ^^ 



Type of impoutidment developed by the Florida State Board of Health, under Bureau contract, that shows promise 

 of controlling mosquitoes and serving the main needs of wintering waterfowl. ( Photo by Florida State Board 

 of Health) 



46 



