72 CLEAN MILK 



and if the milk contains 5 per cent, of fat, 12 lbs. may be fed. The 

 'great milkers are often fed 30 to 40 lbs. of roughage with 15 to 16 

 lbs. of a grain mixture daily. 



Some such rations as the following may be used for milk cows 

 of average weight and giving about 25 pounds of 4 per cent, milk: 



Roughage, 20 lbs. of timothy hay, with a mixture of oats, 2 

 lbs. ; bran, 4 lbs. ; and gluten, 4 lbs. This contains as follows : Dry 

 matter, 26.3 lbs.; digestible nutrients — protein, 2.18 lbs.; carbohy- 

 drates, 13.09 lbs.; fat. 0.58 lbs. 



Roughage, 20 lbs. of timothy and clover-hay, with a mixture 

 of oats, 4 lbs. ; barley, 3 lbs. ; and oil meal, 1 lb. This is equivalent 

 to: Dry matter, 24.3 lbs.; digestible nutrients — protein, 1.88 lbs.; 

 carbohydrates, 12. 1 lbs.; fat, 0.6 lbs. 



Roughage, 30 lbs. of ensilage and 10 lbs. of clover hay, with a 

 mixture of barley, 4 lbs., and bran, 4 lbs. This ration is equivalent 

 to: Dry matter, 25.5 lbs.; digestible nutrients — protein, 1.92 lbs.; 

 carbohydrates, 11.92 lbs,; fat, 0.56 lbs. 



Roughage, ensilage, 30 lbs., and oat hay, 30 lbs.; with mixture 

 of ground rye, 4 lbs., and gluten feed, 4 lbs. This feed is equivalent 

 to: Dry matter, 23.56 lbs.; digestible nutrients — protein, 2.08 lbs.; 

 carbohydrates, 13.32 lbs.; fat, 0.54 lbs. 



It will be seen that the protein is a little low in all these ra- 

 tions, according to Wolff's standard of 50 years ago, but not accord- 

 ing to the Wisconsin standard of Haecker. 



The best nutritive ratio for milch cows is still a matter of 

 dispute. The Wisconsin standard calls, for each 1,000 lbs. of live 

 weight, 2.15 lbs of protein and sufficient fat and carbohydrates to 

 give a nutritive ratio of 1 : 6.9. The Storrs station suggests the 

 same amount of protein as Wolff (2.5 lbs.), but an increase in fat 

 and carbohydrates enough to make the nutritive ration 1 : 5.6. 



There is, however, a concensus of opinion favoring increasing 

 the proportion of protein in the food for cows having large milk 

 yields. Dr. Lehmann's standard for milch cows per 1,000 lbs. live 



