UTILISATION OF FOOD AND ENERGY in 



533 mkg. of work, i grm. of fat 1214 mkg., and 

 from the same quantity of protein 656 mkg. The 

 quantity of food nutrients used differs according 

 to the kind of work and also to the rate at which 

 the work is performed, as well as the gradient. It 

 has been observed that the material, expressed in 

 starch equivalent, consumed by a horse weighing 500 

 kilograms when going at the rate of 78 metres per 

 minute was 43-3 grms. If the speed was increased 

 to 90 metres per minute the quantity rose to 

 48-2 grms., whilst at 98 metres it was 52-2 grms. 

 When a comparison was made between the work 

 done at a trot (195 metres per minute) and at a walk 

 (90 metres per minute), it was found that 41 % more 

 energy was expended in the former case. If the 

 horse carried a load of 125 kilograms, say a rider 

 of average weight, about 8% more energy was 

 used when the rate was that of walking, and about 

 10% more when the pace was that of a trot (186 

 metres per minute) than when no load was carried. 



When drawing a load along an almost horizontal 

 surface at a walk 31-3% of the energy which the 

 animal obtained from its food was used in the form 

 of work. Similar work performed at the trot 

 caused no appreciable difference. On an inclined 

 surface (8-5° grade) at a walk the utilisation of the 

 energy fell to 227%. 



If work is carried on to the point of fatigue, the 

 energy necessary for the performance of the work 



