NUTRIENT REQUIREMENTS. 111 
To illustrate, let us take a cow weighing 1200 pounds 
and yielding 20 pounds of milk daily, and one weighing 850 
pounds yielding 40 pounds of milk, both testing 4 per cent 
fat. 
ros Cs Bee Bat 
Nutrients for 1 lb. of 4 per cent milk, .0467 .214 .0159 
Nutrients for 1 cwt., maintenance, OG eG O1 
For cow weighing 1200 lbs. and yielding 20 lbs. of 4 per 
cent milk: 
Pro. (CoH shat 
Nutrients for 20 lbs. milk, 93 4.28 .32 
Nutrients for 12 cwt. maintenance, .84 8.40 .12 
Ration required, 1.77 12.68 .44 
Nutritive ratio, Leeks 
For cow weighing 850 lbs. and yielding 40 lbs. of 4 per 
cent milk. 
Pro. ‘CoH Rat 
Nutrients for 4.0 lbs. of milk, igs” teioio) Ae: 
Nutrients for 8.5 cwt. maintenance, .59 5.95 .08 
Ration required, 2.46 14.51 .72 
Nutritive ratio, 12625 
But if the cow weighing 12 cwt. yields 40 pounds of 
milk per day and the cow weighing 8.5 cwt. yields 20 
pounds, the nutrient requirements for their respective rations 
according to table—will be as follows: 
Pron wevlsshae 
Nutrients for 40 lbs.of4 percent milk,1.87 8.56 .64 
Nutrients for 12 cwt. maintenance, .84 840 .12 


Required ration, Pega Weyeler Corks 
Nutritive ratio, 1:6.8 
jexnon, (Geiss Jeeie 
Nutrients for 20 lbs. of4percent milk, .93 4.28 .32 
Nutrients for 8.5 cwt. maintenance, .59 5.95 .08 
Required ration, 152° 10:23, 240 
Nutritive ratio, BSc 
In prescribing rations upon the basis of flow and quality 
of milk and weight of cow and using the factors given in the 
table the nutritive ratio becomes a factor of very little im- 
portance the sameas is the case withdry matter in a ration. 


