444 FEEDS AND FEEDING 



essential that the bull receive ample and regular exercise, else he is 

 almost certain to develop an ugly disposition and may become impotent. 



A good sire should be retained in the herd until it is necessary to 

 make a change to prevent too close breeding. He should then, if still 

 potent, be sold to some other breeder. 



No commoner mistake is made than discarding a likely sire at 3 to 4 

 years of age, before his heifers have come into milk to demonstrate how 

 valuable a sire he may be. 



