94 



Bulletin 222. 



From the above table it will be seen that there were considerable 

 variations in the percentage of fat in the various periods. In order 

 to determine the effect upon the percentage of fat of the more liberal 

 feeding while the cows were -at the university, the percentage of fat 

 in the milk of each cow for the first and fourth periods (scant ration) 

 has been averaged and compared with the average of the second 

 and third periods (liberal ration) . The results are given in Table IV. 

 Only the records of the seven cows that remained in the experiment 

 for the entire time are used in this tabulation. 



Table IV shows that, on the whole, the milk was one-quarter of 

 one per cent richer in fat during the whole time the cows were on a 

 liberal ration. The percentage of fat was therefore, increased about 

 6 per cent. Further, each cow without exception gave richer milk 

 while on the liberal ration. It would seem therefore that in the case 

 of these seven cows the percentage of fat was "materially and per- 

 manently increased" by the influence of more and better food and 

 that our thesis is answered in the affirmative, so far as it can be 

 answered in an experiment using only a small number of individuals. 



Table IV. — Percentage of Butter Fat in the Milk of the Seven Cows 



AT THE University. 



There are, moreover, several features of interest in Table III that 

 will repay further study. 



In general it will be seen that the increase in fat was much the 

 most marked in the second period. In the third period there was a 

 marked reduction and in the fourth period most of the cows gave 

 poorer milk than in the first. 



Comparing the first and second periods, a marked individuality of 

 the various cows is seen. This is well shown in Table V, in which the 

 cows have been arranged in order of the greatest increase in percent- 

 age of fat in the second period. 



