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| | PORCINE SOMATOTROPIN (pST) |
 | | In both the high lean and the average lean pigs, pST increased the daily gain, decreased the amount of feed needed to produce the gain, and decreased the carcass backfat. |
 | | For each of the three sex groups, pigs injected with pST consumed less feed each day, increased their daily weight gain, and had greater feed efficiency than pigs that were not treated with pST. |
 | | However, as pST is adopted by a larger share of producers, the premium may decrease as leanness will be expected from all pigs. |
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