RELATIVE VALUES OF FEEDING STUFFS 6ll 



made upon the horse. Experiments upon this subject have 

 been reported by Wolff and his associates at Hohenheim and by 

 Grandeau and LeClerc at Paris. 



Wolff's 1 experiments were upon a single animal, a draft horse 

 weighing about 550 kgs. (1200 pounds). The ration remained 

 the same in all the periods and was insufficient to maintain the 

 weight of the animal in the periods of heavier work. The 

 work was that of draft, done at a slow walk (about 1.9 miles 

 per hour) with in most instances a draft of 60 kgs., the total work 

 per day (not including that of locomotion) ranging from 475,000 

 to 1,800,000 kilogram meters. Under these conditions, no 

 effect on the digestibility of the mixed rations employed was 

 observed. 



Grandeau and LeClerc's investigations 2 were made upon 

 several different horses of the Paris Cab Company and in- 

 cluded experiments upon work and others upon simple loco- 

 motion both at a walk and a trot together with rest ex- 

 periments. 



The plan of the experiments differed from that of Wolff's 

 in some important particulars. The animals used were lighter 

 (about 400 kgs. as compared with 550 kgs.) and apparently of 

 a more active temperament as indicated by their more rapid 

 walk, the velocity of which varied from 2.6 to 3.0 miles per 

 hour. The work, which was that of draft, was done on a dyna- 

 mometer similar to Wolff's. The draft was about half of that 

 of Wolff's experiments and the total amount of work 3 was 

 considerably less, ranging in most cases from 400,000 to 600,000 

 kilogram meters per day, with a maximum in one experiment of 

 785,000. Its amount was approximately the same in all the 

 experiments in each series and was not greater at a trot than 

 at a walk. 4 Finally, corresponding to the main purpose of the 

 experiment, which was to study the feed requirements of cab 

 horses, the rations in the periods of work or of walking exercise 

 were heavier than in those in the periods of rest, the increase 

 being one-tenth in the experiments on locomotion and, in most 

 cases, one-half in the experiments on work. The proportions 



J Landw. Jahrb., 8, Ergzbd. I (1879), 73; 16, Ergzbd. Ill (1887), 53-71. 

 2 L'alimentation du cheval de trait; Berger-Levrault et cie, 1882-89. 



3 Not including that of locomotion. 



4 The total work in the former case was, of course, somewhat greater on account 

 of the greater expenditure of energy in trotting as compared with walking (664). 



