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Sweet Potatoes for Swine

Louisiana Agricultural Experiment Station

Abstract

Conclusions:

1. Sweet potatoes must be fed with a protein supplement for satisfactory results. One pound of tankage replaced 39 pounds of sweet potatoes.
   
2. Sweet potatoes fed with a one-third corn ration and a protein supplement replaced concentrates at the rate of 3.1 pounds of potatoes to 1 of concentrates (1931). In 1932, the ratio was 4.3 to 1 in Lot 3, and 3.7 to 1 (estimated) in Lot 5.
   
3. When sweet potatoes were fed with a protein supplement only 5.23 pounds of potatoes were required to replace 1 pound of concentrates in the 1931 test. In 1932, the ratio was 7.8 to 1.
   
4. Sweet potatoes fed alone in dry lot without supplement required 13.6 pounds of potatoes to equal 1 pound of corn and tankage (1928).
   
5. On account of the protein content of sweet potato tops, pigs require less purchased protein per 100 pounds gain when the potatoes are hogged off in the field than when fed in dry lot.
   
6. According to the records of Kidder and Dalrymple twice the labor is required (man and horse labor) to put in one acre of sweet potatoes as to plant one acre of corn. If labor is expensive and land is cheap, it may pay better to use teams and machinery and plant corn and soybeans unless more than 7 to 8 bushels of potatoes can be grown in place of 1 bushel of corn.
   
7. Hogs cannot pay market prices for sweet potatoes. They can, however, pay good returns per acre when the crop is hogged off and properly supplemented.
   
8. Soybeans hogged off with sweet potatoes did not prove as satisfactory a supplement as tankage (1929). When hogged off with potatoes in addition to a protein supplement, they appear to improve the ration (Lot 5), 1932.
   
9. While sweet potatoes produce more feed per acre than corn, the corn is ready to hog down in Louisiana about August 1, and the hogs can be finished in September. The sweet potato crop is usually ready to hog off in late September and October, when the price of hogs is likely to be c to 1c lower in price.