Animal Husbandry Investigations in 1919. 273 



The most important results come in the second hybrid gen- 

 eration from the pure bred parents. The breeding work of 

 this year has been devoted largely to the production of these 

 second generation females. To November 3, 1919, 13 such 

 cows have been produced. 



Twenty-six first generation hybrids now make up the herd. 

 To make this herd complete it may be necessary to add two 

 more animals to this number. 



Milk records are now being obtained on the first generation 

 females. Fourteen of these cows are now in milk for their 

 first lactation or have already completed this lactation. Three 

 of the second generation cows are now in milk. 



The complete list of the calves which have been born into 

 the crossbred herd from October 15, 191 8 to November 3, 1919 

 is shown in table 7. This list together with those of previous 

 reports will give the crossbred animals thus far obtained. 



The milk production of the first generation hybrids is of 

 interest as it gives the first clue to the milk production which 

 may be expected from a cow known to have a high milk pro- 

 duction inheritance from one side and a low milk production 

 inheritance from the other side. Of such a cow the question is 

 often asked, will the milk production be like the high producer, 

 will it be like the low producer or will it be a blend somewhere 

 between? Figures 3 to 9 give the milk yields of the first gen- 

 eration crossbred, the milk yields of their dams and the milk 

 yield corresponding to the transmitting ability "of the sire. These 

 yields are on a monthly basis. 



All records for the crossbreds have been corrected to the 

 expected milk yield at an age basis of 2 years. If the crossbred 

 daughter has lactation records at say 2 years, 3 years and 4 

 years the record for 3 years is corrected to the expected record 

 at 2 years and the 4 years record to the expected record at 2 

 years. These three records are then summed and the average 

 taken. This average is the record used as the milk production 

 of the crossbred. 



The record for the dam is obtained in a similar manner to 

 that of the daughter. 



