CATTI^E 1479 



chosen. During the trial period one of the groups received a certain 

 amount of dry matter from mangels, the other a corresponding quantity 

 from turnips ; in the post period the two groups were fed in the same 

 manner. In the trial period 79.8 lbs, of mangels (9.3 lbs. of dry matter) 

 were on an average replaced by 84 lbs. of turnips (9.26 lbs. of dry matter). 

 The group fed on mangels produced, during the trial period, a little more 

 milk than that fed on turnips, whilst in the periods before and after the 

 trial, when the two groups received the same diet, the milk production was 

 the same. The mean increase of milk yield for ten cows was 7.27 lbs. per 

 day, or about 2.5 per cent. On the other hand, the percentage of fat in the 

 milk, which in the preparatory period was equal in the two groups, diminish- 

 ed slightly during the trial period in the milk from the group fed on man- 

 gels, but increased again in the post period. This was only a matter of 

 some hundredths of one per cent, so it is not easy to determine what signifi- 

 cance should be attached to the difference. The change of diet had no 

 influence on the composition of the milk or on the general condition of the 

 different groups. 



II. Comparison of Roots {mangels and turnips) Having a Comparatively 

 High Content of Dry Matter. — The trials were made as described above. 

 The different roots contained the following amounts of dry matter : 



Mangels 



Barre-^' Ovoid 



Eckendorf 



Bar!r;;holm 



Superlative 



The animals were given on an average 8.5 lbs. of dry matter per head 

 per day . for this purpose 70.3 lbs of the roots having a high content of 

 dry matter , and 74.6 lbs of the roots having a low content, were required. 

 The nett result showed that the difference in feeding affected neither the 

 quantity of milk, nor its composition, nor the general condition of the 

 animal. In other words, a difference in the content of dry matter produced 

 no difference in the forage value of the roots. 



III. Influence of the Roots on the Quality of the Butter — An experiment 

 made in a farm with two very comparable groups of cows containing six- 

 teen in each. During a sufficient preparatory period both groups received 

 the same ration (half mangel, half turnip). The milk from each group 

 during several consecutive days was dispatched to a dairy where the cream 

 was skimmed, acidified and transformed into butter under identical con- 

 ditions for the two groups. Then in the trial, the feeding was modified so 

 that the first group received 99.2 lbs. of turnips per cow, the second group 

 88.2 lbs. of mangels (giving an equal amount of dry matter). At the end 



