387 



in this work has been limited. The bull calves were killed or 

 vealed. The only ones saved were by the scrub bull brought 

 with the cows and used one year. These calves were used in a 

 feeding test reported in the latter part of this bulletin. Heifers 

 by purebred sires were bred to other purebred sires of the same 

 breed and the heifer calves resulting from this union were also 

 kept for dairy purposes. A few of these heifers carrying 75% 

 of the blood of recognized dairy breeds have just freshened but 

 their records are not available for this preliminary report of the 

 work. 



RESULTS 



Unfortunately, records of production and feed consumed prior 

 to the time the cows were brought to the college farm are not 

 available. Consequently it is impossible to compare the records 

 of the cows under their original environment and those obtained 

 under conditions such as a fairly well managed herd would have. 



However, a comparison of successive lactation periods, after 

 coming to the farm, is of interest and in the following tables the 

 cows are divided into two classes: The two cows that came to 

 the farm at four years of age in table I and those advanced in 

 age in table II. 



SUCCESSIVE LACTATION PEEIODS OF SCKUB COWS 



In table I are shown the milk and fat records of cows nos. 6 

 and 31 for seven successive lactation periods. As these cows 

 were about four years of age at the time of the first lactation 

 period at the college farm, a part of the increase in production 

 should be attributed to their normal development. However, 

 the greater part of the increase is considered due to the develop- 

 ment of digestive and milk secreting systems due to superior 

 feeding and milking, and the residual effects of better feeding, 

 as the cows had all been but scantily fed and poorly cared for 



TABLE 7 AVERAGE YEARLY RECORDS OF THE COWS NOS. 6 



AND 31, THAT CAME TO THE COLLEGE FARM 



AT 4 YEARS OF AGE 



