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The effect of different levels and prolonged supplementation of chlortetracycline upon roughage digestion by sheep



The effect of different levels and prolonged supplementation of chlortetracycline upon roughage digestion by sheep



Jour Animal Sci 16(1): 110-117



In all balance trials with wether lambs fed 80% ground corncobs and 20% concentrate mixture, the initial supplementation of 5 and 10 mg of chlortetracycline or Aurofac 2A/lb. of feed caused a loss of appetite within 40-72 hours. The 2, 5 and 10 mg levels of chlortetracycline decreased the apparent crude fiber, dry matter, organic matter and nitrogen-free extract digestibility. In a prolonged balance trial there was a definite period effect in the chlortetracycline supplemented groups with a recovery of apparent digestibility in the third 10-day period. The average apparent digestibility of crude fiber for both sources of chlortetracycline at the 10 mg level for periods 1, 2 and 3 in the prolonged trial were reduced by 18.4, 11.5 and 5.4%,, respectively. The same trend was present for dry matter, organic matter and nitrogen-free extract.

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