THE YIELD OF MILK 93 



the herd averaged 5,691 pounds of milk and 343 

 pounds of butter. The butter sales averaged $60.28 

 per cow. Dairy records aid in selection and increase 

 the profits. 



Example 3. — The owner of a Holstein-Friesian 

 herd weighs the milk daily in bulk and determines 

 the fat in each cow's milk monthly ; the individual 

 milkings of each cow being weighed for the first 

 three days of each month, a composite sample taken 

 and the per cent, of fat determined by the Babcock 

 test. The average yield of milk for the herd for a 

 term of years was 10,500 pounds per cow, inclusive 

 of all heifers. The yield would have been larger but 

 for the fact that the herd was kept young by selling 

 the older cows. The average yearly per cent, of fat 

 for the herd was 3.45, and the yield of butter was 

 equivalent to 422 pounds. It has long been the aim 

 of this dairyman to have his herd average 406 

 pounds of butter fat per year, but after passing the 

 350-pound mark it has been found more difficult to 

 increase the yield. However, he expects to reach it 

 in time. 



High records can be reached only by years of per- 

 sistent efifort and accurate testing. 



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