EXPERIMENT STATION BULLETINS. 



273 



pounds of grain. In this ration there was 27.51 pounds of dry matter, 

 2.00 pounds of protein, 15.03 pounds of digestible carbohydrates and 

 .96 pound digestible fat. The next column shows that her average 

 daily yield of fat per thousand pounds live weight was 1.07 pounds. The 

 next column shows that this month of December was the first month 

 after the birth of her calf and therefore the first in this period of lacta- 

 tion, as it is called, and finally the last column shows the average weight 

 of the cow for the month. The cows were weighed weekly and the 

 amount stated is the average of the weekly weights. By comparing 

 these weights for successive months it is possible to determine whether 

 the cow 7 was gaining or losing weight. 



It is important to know in what part of the period of lactation the given 

 month is, because the amount of feed eaten in proportion to the fat 

 yielded is much less during the earlier months of the milking period 

 than it is later and where the yields of several cows are to be compared 

 this rioint must be noted. 



DAILY RATIONS PER ONE THOUSAND POUNDS LIVE WEIGHT. 



Smaller coivs. 



35 



