39 



whose basic ration consists of 8 percent hay, the value of 17. 4 percent hay is 

 between $33. 90 and $20. 00 per ton, on the average. An approximation of 

 this relationship is shown in figure 5, which indicates that when 8. 5 percent 

 hay is fed as the basic hay and 17. 4 percent hay is fed as a supplement, the 

 value of the latter as a supplement is $26. 10 per ton. 



There may be some question as to whether the relationships shown in 

 figure 5 should be represented by straight lines. Data are not adequate to 

 permit determination of whether the relationship is linear or curvilinear. 

 Nevertheless, calculated values derived from the straight line will deviate 

 little from that of the proper curve under the conditions are set forth. 



Estimates were made also as to the relative value of 20 percent, 15 percent, 

 and 12, 5 percent crude protein hay when used as a supplement in feeding 

 weaner calves. The three estimates used the same cost for 41 percent protein 

 cottonseed cake and baled hay of good quality, that is, $80 and $20 per ton, 

 respectively. 



The value of superhay as a supplemental feed probably is not directly 

 proportional to its crude protein content. As a general rule, in other feeds, 

 the higher the crude protein content the more digestible is the crude protein 

 in the feed. It may be assumed that this is true for hay because no evidence 

 to the contrary can be shown. If the crude protein content of hay is increased 

 by 10 percent, its feeding value is increased by something more than 10 per- 

 cent, or if it is decreased by 10 percent, its feeding value is decreased by 

 more than 10 percent. This has been taken into account in figure 5 and table 

 15. Although the evaluation used in figure 5 is not exact, it gives a basis for 

 evaluating superhay that is more logical than the use of straight percentage 

 figures. 



Table 15. - Estimated value per ton of superhay when fed with basic hay of 



differing quality to weaner calves 



Crude pro- 

 tein content of 

 superhay 

 (percent) 



Base hay with crude protein content of- 



6. 5 : 7. 5 : 8. : 8. 5 : 9. 5 : 10. 1 



percent : percent : percent : percent : percent : percent 



20. 00 

 17.40 

 15.00 

 12. 50 



Dollars Dollars Dollars Dollars Dollars Dollars 



39. 50 



33.80 



31.40 



28. 



60 



23.40 



20.00 



33.90 



29.80 



27. 90 



26. 



10 



22. 50 



20.00 



28.70 



26. 10 



24. 90 



23. 



80 



21. 50 



20.00 



23.70 



22. 60 



22. 10 



21. 



60 



20. 70 



20.00 



