344 MAINE AGRICULTURAI. EXPERIMENT STATION. I912. 



It is clear that the four class 2 males produced a progeny 

 generation, which, though relatively small in absolute numbers, 

 agrees very closely in respect to its gametic distribution with the 

 expected results. 



Matings of a Barred Plymouth' Rock male of class 8. Males 

 of class 8 are homozygous with respect to the absence of the 

 nrst production factor, and heterozygous for the second, their 

 gametic formula being fhL-^. fhh. But one bird of this type was 

 used in the experiments. 



B.P.R. $ 26. Indicated constitution = fkLi fhh. 



This was one of the original stock in 1908. Nothing further 

 is known of his breeding than that he was the son of a bird that 

 had laid 200 or more eggs in her pullet year. His dam must 

 have been of class i, since a class 2 2 could not produce a class 

 8 $ . Male 26 was bred as a cockerel in 1908 with the follow- 

 ing results : 



Matings: A. With 2 ? ? indicated to be of class i = fLiL^ fhk- 



? Progeny 



Winter Production : Over ,?o Under 30 Zero 



Observed 22 92 5 



Expected 4.25 8.5 4.2^=) 



Mean winter production of all 



2 9 in indicated class 35.00 9.89 eggs o eggs 



B. With 5 ? ? indicated to be of class 4 = fIJ.. FL,l. 



2 Progeny 



Winter Production: Over ^.0 Under 30 Zero 



Observed 6 6*. o 



Expected 6 6 



Mean winter productions of all 



2 2 in indicated class 69.00 eggs 15.83 eggs 



All 2 Progeny. 



Winter Production: Over 30 Under 30 Zero 



Observed 85 152 5 



Expected 10.25 14.5 4-^5 



Mean winter production 60.50 eggs 12.26 eggs eggs 



