10 FORAGE CROPS IN DENMARK 



fed with the same quantities of Elvetham mangels. But 

 while the Eckendorf roots were grown on the farms where 

 they were used, the Elvetham roots used on both farms were 

 taken from those grown on the first farm. The contents of 

 sugar in the roots fed to the different groups of pigs were, 

 therefore : 



Sugar. Total solids 



per cent. per cent. 



On the first farm, for groups C and E, Eckendorf with . 8-8 12-7 



C x and E! Elvetham . 10 -0 14'8 



On the second farm, for groups C and E, Eckendorf . 4-5 9*3 



Cj and E x Elvetham . 10 -0 14-8 



When the feeding experiments with these groups were con- 

 cluded it was found that the average increases in weight per 

 pig in ten days were : 



On the first farm, for groups C and E . 8'6 and 8 '9 Ibs. respectively 

 G! and E t . 8 '7 and 8-6 Ibs. 



or about the same, corresponding to the somewhat similar 

 contents of the two kinds of root used there, but :-r- 



On the second farm, for groups C and E . 7 '6 and 8*4 Ibs. respectively 

 Cj and E! . 8-9 and 9'3 



or a considerably greater increase of the pigs which had the 

 " sweeter " Elvetham roots, i.e. roots with the higher contents 

 of sugar and dry matter. 



This experiment, therefore, gave a very clear indication 

 that the feeding value of roots depended on the contents of the 

 roots. This gave a hint to growers of roots which was not lost 

 on them, that it would be of advantage to grow such roots as 

 yielded the greatest amount of feeding- stuffs per acre. But as 

 Fjord did not consider it safe to draw a definite conclusion from 

 this test, carried on on two farms only, the question of the 

 relation between the analysis of roots and their feeding value 

 was taken up for further investigation. 



A new set of experiments was therefore carried out in 

 1890-92 on three large farms in 7 series, with 229 pigs arranged 

 in 41 groups, in order to test the relative values of corn and 

 various kinds of roots. These experiments were planned by 

 Fjord, but after his death in January, 1891, they were carried 

 out by F. Friis, his successor at the Laboratory for 



