CHAPTER VII 



PROBLEM OF HIGHER FECUNDITY 



Various factors relating to environment, such as feeding, 

 housing, and management, affect the egg yield, and are 

 discussed in other chapters. Unless these conditions are 

 favorable the egg yield will be low. It has also been seen 

 that systems of breeding and mating that affect vigor in- 

 fluence the egg yield. 



It is another question whether high egg-laying is trans- 



LIKE BEGETS LIKE 



Two full sisters. Oregon Station. C119 (left) laid 241 eggs. C166 (right) 



laid 233 eggs. 



mitted from parent to offspring. This is probably the most 

 important problem of all. It would seem that any doubt 

 on this point could very easily be set at rest by actual dem- 

 onstration, but experimenters have found the problem a 

 difficult one. The actual experimental data at hand are 

 not very extensive and possibly not conclusive enough to 



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