266 Feeds and Feeding. 



The water evaporated daily by the horse with varying exercise 

 and diet was found to be as follows : 



Condition of horse Water 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, 1 studying the losses in weight, after making corrections for 

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

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

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

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

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

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

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

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

 lost 22 Ibs. 



Boussingault 2 found the maximum variation in the weight of 2 

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

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

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

 ing, and 1,038 Ibs. 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, Fiittemnges- 

 lehre, 1872, p. 370. 

 2 Ann. Sci. Agron., 1884, II, p. 330 ; Eural Economy, p. 397. 



