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MASS. EXPERIMENT STATION BULLETIN 255 



Age 



Table 1. ^Showing Condition of Cows 



General condition 



Cows 10 and 11 were sold on August 8, 1927. Age and condition are given for that date. 

 Cow 42 was slaughtered on January 10, 1928. Age and condition are given for that date. 



The mature cows receiving the .supj^lement made a considerable gain in weight 

 during the two years of the experiment, while the other group showed little change. 

 The supplement may have made this difference, but with this number of animals it 

 is unsafe to draw a positive conclusion. 



Table 2. — Maintenance of Body Weight in the Mature Cows 



The second weight for Cows 10 and 11 was taken in August, 1927, when they were sold. 



Growth of young cows and heifers 



Ten of the animals were immature at the commencement of the experiment: 

 six of them young cows (under 5 years of age) and four unbred heifers. In 

 the case of the young cows variations due to variable stage in gestation have been 

 taken into account as with the mature cows. With the heifers unbred when the 

 experiment started, obviously this method could not be used, but three of the four 

 are in an almost identical stage of gestation this season and the fourth is also 

 bred, though not as far advanced, so from that standpoint their weights can be 

 considered comparable (see Table 3). 



