Chlortetracycline and oxytetracycline at high levels in a protein supplement for growing-finishing swine

Conrad, J.H.; Beeson, W.M.

Jour Animal Sci 19(2): 363-367

1960


Accession: 013984474

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Abstract
Chlortetracycline at levels of 50, 100, 150, 200 and 250 g per ton of protein supplement fed to healthy pigs on concrete resulted in a highly significant (P < 0.01) increase in gains. Differences in gains between lots fed the different levels of antibiotic were not statistically significant. Similar levels of oxytetracycline for pigs on pasture failed to increase gains significantly. Average daily feed intake was increased by both antibiotics at all levels, but feed efficiency was not consistently improved.