222 



FARM MANAGEMENT 



the number of those on hand at the end of the month can 

 be gotten by subtracting. At the end of the year, this 

 results in some error, as some will die that are not found. 

 145. Animal records. If many cows are kept, it is 

 often desirable to keep a record of each animal. One of 

 the easiest ways to do this is to use a blank book with 

 numbered pages. If ear tags are used, the pages should 

 be numbered to correspond with .the ear tags. One or 

 two pages will give room enough to keep a complete 

 record of a cow or horse for a lifetime. Figure 61 shows 

 a page from such a record book. It gives a complete 

 history of a cow whose ear tag number is 24. Two of 

 her calves were kept. Their records were on pages 27 and 

 31. At the bottom of the page, columns are ruled for the 

 cow's milk record. 



RELATION OF SIZE OF ANIMAL TO EFFICIENCY 



146. Size of cows and profits. Of two animals that 

 are equally efficient users of food, the larger animal is 

 usually much more profitable. Many tests of dairy cows 

 have been made to see which ones produced the most butter 

 for feed used. These tests do not indicate which is the 



