
6. Sterility in birds produced by immune responses, by 
B. C. Wentworth. 
7. Relationship between low fertility and rose comb in the 
domestic fowl, by R. D. Crawford. 
8. Screening tests of chemical materials having candidacy in 
producing sterility in birds, by D. K. Wetherbee and 
M. F. Landy. 
9. Hormonal stunting of development of the avian infantile 
gonadotrophic system, by D. K. Wetherbee. 
10. Ecology and physiology of reproduction inhibition in breeding 
wild bird species, by D. K. Wetherbee and R. P. Coppinger. 
11. Radio mimetic sterility in certain avian species, by 
D, K. Wetherbee. 
While the need for continuing research in sterility has long been 
recognized in poultry science, only recently has wildlife management 
seized upon the potential rewards of investigation in sterility and 
fertility. To raise the threshold of productivity of wildlife species 
to fill improved carrying capacities of managed habitat is an obvious 
advantage to increasing fertility. A less obvious, but perhaps even 
more useful, tool in wildlife management is the manipulation of repro- 
ductive failure in the control of certain wildlife species. Where 
reduction of nuisance species is concerned, it has been postulated that 
the presence of a given number of sterile individuals in a population 
exerts a much greater biological control pressure on that population than 
removal of that same number of fertile individuals. 
It is the hope of the participants in this seminar that the collec- 
tion of reviews presented here will serve to stimulate increased investi- 
gation in avian sterility and fertility. 
