New York Agricultural Experiment Station. 97 



The different individual records were all grouped and averaged 

 according to variations in the fuel value above and below 30,000 

 Calories per day per 1000 lbs. live weight. In general, with 

 the food used, a ration with a fuel value of 30,000 Cal. would 

 contain 15 lbs. of total digestible organic matter. 



As would be expected the comparisons pf rations on the basis 

 of energy showed the same general tendencies evidenced by the 

 comparison of somewhat related groupings made according to 

 the amount of total nutrients, although the effect of the protein 

 relation was more evident. 



Statement of the general results which accompanied changes 

 in the fuel value of the ration will be found on p. 63 in the gen- 

 eral summary. 



THE PROTEIN CONTENT OF THE RATION. 



In formulating rations more consideration has been always 

 given to the protein than to other constituents both because it is 

 so essential and because it is so seldom found in excess in the 

 cheaper foods. The nutritive ratio is based upon the relative 

 amount of protein. The absolute amount desirable in a ration 

 has also been indicated in the standards. The data from the 

 groupings of the different records made with relation to the 

 absolute amount of protein are here presented. Those from 

 comparisons made on the basis of nutritive ratio are later con- 

 sidered. 



LITTLE CHANGH IN THE PROTEIN CONTE>fT. 



The average data from 91 records which covered periods when 

 little change in the amount of protein was made, although there 

 was some increase of the total organic nutrients in the ration, 

 are found in Table XXI. The falling off in milk yield was less 

 than the normal amount. The rate of gain in live weight was 

 slow but somewhat faster before the change than after. 



