DAIRYING IX PORTO RICO. , 19 
eradicated the farmer can grade up his native herds by using a 
better sire than the one preceding it. 
The animals should receive every possible attention throughout 
the whole of their lives, but especially during the natural growing 
period. They should be well fed, comfortably housed, and shielded 
from exposure to tick infestation, disease, and the elements, fatigue, 
overcrowding, and from anything that tends to frighten them or 
make them timid. 
Only those cattle that transmit to their offspring the high-produc- 
ing qualities of their ancestors should be kept, and the unprofitable 
cow, that is, the one which gives poor yields, should be eliminated 
from the herd. 
The animals should be given plenty of fresh, clean water, it being 
remembered that they need between 50 and 100 pounds a day, de- 
pending upon the feed. 
The stockman should remember that the secret of successful cattle 
raising is careful selection, constructive breeding, and skillful feed- 
ing with well-balanced rations. 
o 
