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ing, he wants the greatest amount of TDN and/ or digestible protein per ton at the ldast cost to meet the nutritive and physiological require* ments of the animal. Besides the bulk (not less than 3/4 lb. daily of hay equiv* lent per 100 lbs. live weight) in silages he wants TDN and digestible protein. In corn silage our main concern is "HON per ton while in a legume grass silage it is both digestible protein and TDN. Now lets take a look at our six corn silage analysis. Aver age TDN content was 17.6 with a high of 23.7% and a low of 12.9%. This figures 83-8*% difference in amount of digestible nutrients! What about amouncs of tl^ese silages to feed? To satisfy the nutritive requirements of a 100 lb. dry beef cow only 40 lbs. of the highest quality silage is needed as compared to approximately 73 pounds of the lowest Think of the difference in labor .lauling, etc. into and out of storage. This difference of 33 >ounds per cow per day figures up right fast when we consider .he possibility of their being 30-40 or as many as 100 cows in the herd to feed. What about storage space. We must charge this annual cost to the cow too. Thus we see the/difference of TDN makes difference in fixed costs. WHAT ABOUT HAYS?; was there much difference? Yes. Here the big difference was not in TDN but in digestible protein. High protein content is desired. This is why we grow legume grass mixtures or even straight Alfalfa, etc. The hay analysis summary quickly tells of the difference.
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