Breeding Power and Sterility. 123 



whose skins are filled with tallow, instead oi ]mcy , /riar bled 

 meat," in far too many instances. 



Of course the same inactive fat-forming tendency is es- 

 tablished in the cows of inactive fat-forming herds, with 

 the effect of greatly reducing their vitality and fecundity, 

 the vital blood being so far reduced in quantity, and life, 

 or circulating quality, that numbers of costly cows have 

 died in their prime from not having a sufficient quantity 

 of vital blood to maintain life. 



Motion in animals is caused by muscular contraction. 

 Blood divested of vital oxygen is practically dead, as it 

 will not circulate ; but when vitalized by oxygen the blood 

 enters the substance of the muscles and muscular organs, 

 as the muscles thicken by expanding, while their length is 

 contracted ; so exercise increases the supply of blood in 

 muscular structures, by increasing the number of muscular 

 motions from contraction. This is the law, and the way 

 in which exercise increases growth. Exercise similarly 

 increases breathing, also, thus adding its life element to 

 the blood, and completing its fitness to promote growth, 

 and this in extent according to activity, or the number of 

 regular muscular contractions, thus preparing a supply of 

 vitalized blood according to activity and demand, a suit- 

 able supply of food being, of course, provided and con- 

 sumed. 



By muscular activity, active cattle prevent their muscles 

 from wasting, and maintain the size of their vital organs 

 by the activity and fullness of their circulation, the active 

 exercise maintaining full breathing activity, thus complet- 

 ing the nutritive quality of the blood. It is also true, 

 that the development of heat in the tissues, and warmth 

 in all parts of the body, is the immediate result of active 

 breathing, corresponding with exercise, as we all know ex- 

 perimentally — our own life having been saved when in 

 danger of freezing, by developing heat by rapid activity. 



