748 



EXPERIMENT STATION RECORD. 



the daily ration of the 3 periods was 14.23, 16, and 14 lbs., respectively. 

 The analyses of the feeding stuffs given, the amount of nutrients con- 

 sumed, weiglit of cows, and the yield ^nd composition of the milk are 

 tabulated. 



" The cows lost from 15 to 30 lbs. weight in passing from the first to the second 

 periods, and this loss was partially regained during the third period. These 

 changes in live weight can be readily explained by the less weight of silage eaten 

 in the second period, with no marked change in the quantity of water drank in any 

 period. . . . 



" When we see that in the second period of this experiment practically the same 

 weight of milk was produced, and that owing to an increase in the dry matter of 

 the milk there was actually a lai-ger production of milk solids, we have good pr^ 

 sumptive evidence that the ration containing the 30 lbs. of [native] field corn silage 

 was more efficient than the previous ration containing 40 lbs. of Southern corn 

 silage. This evidence is strengthened by the fact that when in the third period a 

 return is made to the Southern corn silage the yield of milk solids is decidedly 

 diminisheil. 



" [The indications are] that, pound for pound, the Maine field corn silage was 

 worth more than the Southern corn silage, and that the difference was practically 

 in the proportion of the amount of digestible dry substance in the 2 materials. 

 This is the result which a careful consideration of the facts learned in other ways 

 would lead us to expect." 



The infiuence of widely differing rations n/pon the qvantiiy and quality 

 of milk (pp. 73-82). — An experiment is reported with 3 cows, covering 3 

 periods of 35 days each, in which the following rations were compared: 



Ration 1 : 



Timothy hay ad lib. 



Corn meal 2 pounds. 



Cotton-seed meal 2 pounds. 



Gluten meal 2 pounds. 



Ration 2 : 



Timothy hay ad lib. 



Corn meal 6 pounds. 



Cow A received ration 1 during the first and third periods and ration 

 2 during the second period, and cows E and L T received ration 2 dur- 

 ing the first and third periods and ration 1 during the second period. 

 The nutritive ratio of ration 1 was 1 to 6.7, and of ration 2, 1 to 12.3. 

 Both rations furnished practically the same amount of digestible mate- 

 rial. The amounts of food eaten and the yield and coipposition of the 

 milk, melting point, volatile acids, and iodin equivalent of the butter 

 are tabulated for each cow. The yield of milk and of milk solids was 

 as follows : 



Yield of milk and milk solids on nitrogenous and carbonaceous rations. 



