APPENDIX 249 



column. The difference between these readings is the 

 percentage of fat in the milk. There are five small spaces 

 between each two of the per cent marks. Each small space 

 represents .2^{ . Thus, if the fat column runs even with 

 the fourth short mark above 7, its reading would be 7.8%. 

 (j) Empty and wash test bottles. 



9. The test will show the per cent of butter-fat. It 

 should run between three per cent in poor dairy cows and 

 six or seven per cent in very fine dairy stock. To find 

 the amount of butter-fat in a gallon of milk, multiply 

 814 lbs. by the per cent found in the test. (Milk varies 

 in weight according to the amount of butter- fat.) 



10. How many pounds of butter-fat in 4,000 lbs. of 

 milk that tests 4% ? 



11. How much less butter-fat if the milk tests 3% ? 



12. A cow gives an average of 18 lbs. of 4% milk per 

 day for 300 days each year. What income does she yield 

 annually with butter-fat at 25 cents a pound? 



13. A dairy farmer has two cows each producing 

 6,000 lbs. of milk a year. The Babcock test shows the 

 milk of one cow to contain 3%, and the other 6i/^% of 

 butter-fat. What is the difference in income from the 

 two cows when butter-fat averag6s 27 cents a pound? 



14. A certain farmer kept ten pure bred Guernseys, 

 each of which produced daily, 30 lbs. of 6% milk. The 

 production of this herd always declined during July and 

 August on account of flies to an average of 25 lbs. daily. 

 By spraying his herd regularly to ward off flies the 

 farmer kept the herd up to its daily amount of 30 lbs. 

 What was the money saved in the two summer months 

 by spraying when butter-fat was 22 cents a pound? 



