bership in the American Academy of 

 Arts and Sciences. 



For brief periods following 

 Yeager's retirement, both W. W. Smith 

 and R. Eggert held appointments as 

 head of Horticulture. In 1963 Horti- 

 culture and Agronomy merged to form 

 Plant Science with some personnel 

 moving to Soil and Water Science. 



Poultry Science 



Poultry diseases directly affect the cost 

 of commercial poultry production, the 

 rate of growth of the industry and the 

 financial stability of the individual 

 poultry farm enterprise. The depart- 

 ment made a strong effort to keep its 

 disease research program current. As 

 with humans, respiratory diseases of 

 poultry are a continuing problem. 



Following the development of meth- 

 ods for mass vaccination of flocks 

 against infectious bronchitis and 

 Newcastle disease, attention turned to 

 the chronic respiratory disease com- 

 plex (CRD), then economically impor- 

 tant to poultrymen. W. R. Dunlop was 

 the first to isolate the chronic respira- 

 tory disease virus and to show that a 

 pleuro-pneumonia-like organism 

 (PPLO), complicated by vaccination 

 and the CRD virus, produced air sac 

 disease. This was followed by an effort 

 to produce PPLO-negative chicks by 

 treatment of breeders with an antibi- 

 otic to suppress hatching egg trans- 

 mission of the agent. By 1957, infec- 

 tious synovitis, a hock-joint disease, 

 was new to New Hampshire. The ap- 

 plication of cell culture technique as 



Testing for PuHorum disease in the UNH Diagnostic Laboratory 



40 



