Counotte G H, Eefting T, Bosch A
Tijdschr Diergeneeskd. 1984 May 1;109(9):339-44.
The distribution of oxytetracycline hydrochloride in two batches of 4,000 kg of pig-rearing pellets (400 ppm) was studied. The stability of oxytetracycline in this feed was also determined. The concentration of oxytetracycline in the feed was determined by high pressure liquid chromatography. The premix contained more oxytetracycline (27 per cent) than the proportion stated. The results show that the first 1,000 kg of feed contained less (350 mg/kg) oxytetracycline than the other 7,000 kg (435 mg/kg). After producing 8,000 kg of feed with oxytetracycline, 4,000 kg of feed not containing oxytetracycline was produced. Still, this feed was found to contain 13 mg/kg of oxytetracycline. When the feed was stored for 150 days at a temperature of from 1 to 2 degrees C and again for 270 days at 20 to 25 degrees C, it contained 86.5 per cent of the oxytetracycline present after production of the feed.
对两批4000千克猪饲料颗粒（400 ppm）中盐酸土霉素的分布情况进行了研究。还测定了土霉素在这种饲料中的稳定性。通过高压液相色谱法测定饲料中土霉素的浓度。预混料中土霉素含量（27%）高于规定比例。结果表明，最初的1000千克饲料中土霉素含量（350毫克/千克）低于其他7000千克（435毫克/千克）。在用土霉素生产8000千克饲料后，又生产了4000千克不含土霉素的饲料。然而，仍发现这种饲料含有13毫克/千克的土霉素。当饲料在1至2摄氏度的温度下储存150天，然后在20至25摄氏度下再储存270天时，其土霉素含量为饲料生产后土霉素含量的86.5%。
