VIGOR IN FRODUCTION-BRED FLOCKS 



153 



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Quarantine measures as carried out with the Massachusetts Experiment Station 

 flock afford the safest preventive of infectious and contagious diseases. Under New 

 England conditions quarantine measures are an essential part of successful manage- 

 ment. 



Clean, vigorous chicks can be most economically produced on rolling land with 

 abundant grass and shade. Crowding is often disastrous. A systematic three- or 

 four-year rotation of range should be practiced to avoid diseases and parasites. 



