266 Feeds and Feeding. 



The water evaporated daily by the horse with varying exercise 

 and diet was found to be as follows : 



Ciondition of horse Watei evaporated per day 



At rest 6.4 pounds. 



Walking exercise 8.6 pounds 



Work at a walk 12.7 pounds 



Trotting 13.4 pounds 



Work at a trot 20.6 pounds 



In this study the distance traveled and the work done was the same 

 in each case. It is shown that the horse when trotting gave off three 

 times as much water vapor as when at rest. Such losses diminish 

 the amount of energy available for the production of work. 



Rueff/ studying the losses in weight, after making corrections for 

 food and voidings, found that farm horses doing medium work lost 

 7.7 lbs. each on the average during 11 hours. Army horses ridden 

 for 25 minutes at walk, trot, and gallop lost 4 lbs. each on the average. 

 An 8-yr.-old gelding carrying a 176-lb. load lost 11 lbs. in 25 minutes. 

 Another horse lost the same amount and after 24 hours had regained 

 only 1 lb. A 14-yr.-old blind stallion ridden 90 minutes by a rider 

 weighing 166 lbs. lost 33 lbs., regaining 22 lbs. during the following 

 24 hours. A 23-yr.-old, 770-lb. mare ridden 6 miles at a walk or trot 

 lost 22 lbs. 



Boussingault' found the maximum variation in the weight of 2 

 horses on the same keep and care during 15 days to be 25 and 28 lbs. 

 respectively. A horse put in the scales each morning at 4 o'clock 

 after fasting weighed 1,051 lbs. one morning, 1,060 lbs. the next morn- 

 ing, and 1,038 lbs. the third morning. Boussingault calls attention 

 to the necessity of carrying on feeding experiments for consider- 

 able periods and with several animals in order to escape, or rather 

 lessen, the errors which are introduced into the calculations thru ac- 

 cidental variations in the weights of the animals studied. 



^Landw. Wchenbl. d. k. k. Ackerbaum., 1870, 109; v. Gohren, Fiitterunges- 

 lehre, 1872, p. 370. 

 - Ann. Sci. Agron., 1884, II, p. 330; Rural Economy, p. 397. 



