Animal Husbandry Investigations in 1919. 281 



The milk production of Crossbred' No. 12 clearly follows 

 that of her pure bred Holstein-Friesian parent as far as the 

 ninth month of lactation. The dropping of her lactation from 

 this point on does not represent a true statement of the cow's 

 producing capacity for the dropping in the milk production at 

 this time represents only an effort of the herdsman to dry the 

 cow off for a succeeding lactation. It is entirely probable there- 

 fore, that this cow shows the high milking capacity of her high 

 producing parent throughout the entire lactation. 



The record for Crossbred No. 15 shown in figure 31 is 

 based on the corrected records of two lactations. The record 

 for her dam is based on that for four lactations. The sire's 

 record is the average of four of his tested offspring. It is clear 

 that Crossbred No. 15 is much higher in milk production than 

 her pure bred Aberdeen Angus mother. It is not so clear al- 

 though it is probably true that up to the sixth month of lacta- 

 tion Crossbred No. 15 is giving less milk than would be ex- 

 pected of her given that she was of her sire's breeding. From 

 the sixth month on Crossbred No. 15 gives the milk yield ex- 

 pected of her sire's breeding. 



It will be noted that the dam's yield stops in the eighth 

 month of lactation as the latest date at which her milk flow could 

 be maintained. The milk flow of Crossbred No. 15 on the other 

 hand is maintained equally well with that of the Jersey sire. 

 The tendency to a prolonged milk flow was maintained by the 

 Crossbred cow in accordance with the milk flow expected of 

 her sire. 



The milk production of Crossbred No. 16 as shown by the 

 solid curve in figure 32 is based on only one lactation record. 

 This cow has been difficult to settle. She has in fact lost prac- 

 tically one whole lactation due to this cause. At the present 

 time she is in milk for her second lactation. This lactation 

 started, however, at 4 years old with a previous rest of one year 

 and one month. If the milk production of this first month is 

 any indication the milk production of this lactation will be much 

 higher relatively than the milk production of her first lactation. 



This Crossbred cow is the result of a mating of an Aber- 

 deen Angus bull, Kayan 167617 on to a Jersey cow, College 

 Ruth 4895 M. S.. J. HB. The milk production of this Crossbred 

 is clearly intermediate between the two breeds, favoring if any- 



