Appendix table IV 4. Marginal value products for selected resources with 

 medium quality cows. $4.00 price of milk, various ratios of cows to 

 cropland and with and without sales of hay. 



Item 



Ratio of cows to cropland 



.10 .15 .20 .25 .?,0 .35 



.40 



Marginal rale of 

 substitution of 

 cows for cropland 



Hay sales at .$27.00 per ton 



20 20 20 20 24 35 



33 25 13 13 9 4 



320 320 320 320 320 320 



13 14 14 14 15 17 



27 27 27 27 27 33 



210 206 203 203 203 101 If.r, 



-1.9 



-1.7 —1.3 —0.65 —0.64 —0.36 —0.11 



Marginal return 

 over feed costs 

 ($/cows) 



Marginal rates of 

 substitution of 

 cows for cropland 



Hay sales jirohibited 



i7G 



270 



243 



-7.6 



23 5 



234 



i06 



166 



-2.2 —0.66 —0.11 



78 



