MANUAL OF CATTLE-FEEDIKG. 237 



of its large amoitnt and because a greater quantity of heat 

 is required to increase the temperature of a pound of water 

 one degree than is sufficient to ejEect the same change in a 

 pound of any other substance. 



The effect of excessive drinking on the production of 

 flesh and fat has ah-eady been mentioned in the two pre- 

 ceding chapters, and there can be little doubt that a part, 

 at least, of this effect is duQ. to the demand for heat thus 

 made on the system. 



The last line of the table on p. 235 affords an illustra- 

 tion of the influence of the amount of water drunk on the 

 excretion of carbonic acid. Although the quantity of 

 water evaporated is less than in the two preceding cases, 

 more carbonic acid is excreted, evidently on account of the 

 considerably larger amount of water drunk. It is notice- 

 able that the urinary nitrogen in this experiment is also 

 more than in most of the o'thers. 



Further examples of the influence of the quantity of 

 water drunk upon the decomposition of matter in the 

 organism might be given, but the few results which have 

 as yet been reached in this direction, while they afford im- 

 portant practical hints, are still so meagre that no very ex- 

 tended conclusions can be based on them. 



Practical Gonelusions. — In the foregoing pages we 

 have seen that the production of heat makes large demands 

 on the food supply of an animal, and that various circum- 

 stances may influence the amount of heat produced and 

 thus effect an economy or a waste of fodder. There re- 

 mains to be considered the practical application of these 

 facts to the feeding and care of cattle. 



Temperature of Stable. — ^It is evident that the warmer 

 tlie air of the stable is kept the less heat the animals will 

 lose by radiation, and consequently the greater will be the 



