Additional Problems

1. Formulate 1 ton of a 18% protein feed for growing pigs using corn (9% protein) and soybean meal (48% protein). Other ingredients in the diet are shown below.

2. Suppose a 1100-lb, dry, pregnant cow consumes bermudagrass hay dry matter at 2% of body weight. Will the hay alone satisfy her protein need? Will her TDN needs be met from only hay? (refer to section V. pp. 243-244)

Analysis of the hay (dry matter basis): 83% dry matter, 11% CP, 58% TDN

Example of protein calculation: 1100 lb x 2% = 22 lb DM/day

22 lb DM X 11% = 2.4 lb CP/day from the hay

On an as-fed basis, how much hay will cow need to consume to obtain 22 lb. DM?

3. Using cow information above, calculate the nutrients supplied from feeding poor quality bermudagrass hay.  Assume the cow can only consume 1.5% of her body weight in DM from this hay.

Hay analysis (dry matter basis): 88% DM, 7% CP, 45% TDN

Because the hay quality is poor, the cow can't eat enough of it daily to meet her needs for CP and TDN. Establish the specifications for the supplement from the deficiencies above.

Use the above specifications to formulate a supplement.  Use ground corn (9% CP) and cottonseed meal (41% CP) to formulate the supplement.  Because we are not balancing for minerals, a complete mineral supplement must be provided free choice at all times.