POULTRY BREEDING. 2JI 



column is recorded the absolute number of embryos which 

 "died in the shell;" i. e., sometime during incubation. These 

 are, in other words, the fertile eggs which fail to hatch. In the 

 sixth -column is recorded the absolute number of chicks which 

 hatch in a given batch, and the following column gives the per- 

 centage of the fertile eggs which hatch. The following column 

 headed "Died in three weeks" records the number of chicks 

 arising from the original batch of eggs which hatched out but 

 died sometime within three weeks after hatching. The two 

 following columns give respectively the number of the incubator 

 and the brooder in which this given batch of eggs and the chicks 

 arising from it were handled. At the right hand edge of the 

 sheet is left a space for any notes regarding particular lots of 

 eggs which it may be desirable to record. 



It may perhaps be well to point out that this hatching record 

 forms no absolutely necessary part of the pedigree records. It 

 does, however, include data of the sort which every practical 

 breeder must have. The great practical value of the data which 

 come out of hatching records kept in this way in their bearing 

 on the general problem of building up the utility characteristics 

 of the flock by breeding will be discussed in another place. 



It will be noted that this sheet is well adapted to keeping the 

 history of individual eggs when for any reason it is desired to 

 do this in an experiment. When used in this way a single line 

 will of course be devoted to a single egg instead of to a "clutch" 

 of eggs as described above. When used in this way the percent- 

 age columns would naturally be used as "summation" columns 

 for entering totals and sub-totals. 



INCUBATOR RECORDS. 



When pedigreed eggs are set in incubators it is necessary that 

 a record regarding the eggs put in should be kept. These 

 records are made on sheets of the sort shown in Figure 13. 



