Effect of dietary chlortetracycline on productivity and respiratory disease in pigs

Chlortetracycline(CTC)의 사료 첨가가 돼지의 생산성과 호흡기 병변에 미치는 영향

  • Kwon, Young-bang (College of Veterinary Medicine and Research Institute of Veterinary Medicine, Chungbuk National University) ;
  • Lee, Won-hyung (College of Veterinary Medicine and Research Institute of Veterinary Medicine, Chungbuk National University) ;
  • Lee, Wan-kyu (College of Veterinary Medicine and Research Institute of Veterinary Medicine, Chungbuk National University) ;
  • Kang, Jong-koo (College of Veterinary Medicine and Research Institute of Veterinary Medicine, Chungbuk National University) ;
  • Jung, Young-chul (Jung P&C Institute) ;
  • Kim, Sung-hoon (Cheil Breeding Stock Co., Ltd.) ;
  • Han, Byung-woo (Cheil Breeding Stock Co., Ltd.)
  • 권영방 (충북대학교 수의과대학 및 동물의학연구소) ;
  • 이원형 (충북대학교 수의과대학 및 동물의학연구소) ;
  • 이완규 (충북대학교 수의과대학 및 동물의학연구소) ;
  • 강종구 (충북대학교 수의과대학 및 동물의학연구소) ;
  • 정영철 (정P&C연구소) ;
  • 김성훈 (제일종축 농장) ;
  • 한병우 (제일종축 농장)
  • Accepted : 2000.05.19
  • Published : 2000.06.25

Abstract

The effects on CTC (T1) and CTC, Sulfathiazole and Penicillin Combination (T2) medication in feed through one life cycle of pigs, namely, weaning, mating, farrowing, lactation, growing, finishing and slaughter, were tested under local condition. In sow phase, productivity and the number of microflora in urine before and after medication of CTC were studied and average daily gain and feed conversion rate were checked during growing and finishing period. All pigs reached at 155 days old were slaughtered for pathological examination. 1. Litter size, farrowing rate and survival rate at birth were improved by CTC medication from weaning to 21th day after mating and mortality of piglet at weaning, 25 days after farrowing, was reduced in the CTC medication group, but no siginificant. 2. The number of microflora in the sow urine was changed with the medication at 200ppm of CTC in feed. In particular, the number of E coli, Samonella and Staphylococci were reduced by CTC medication. 3. The average daily gain and feed conversion rate of grower and finisher pigs was improved significantly in both treated groups, most in the high level CTC (T1) medicated group and was lowest in the control group. 4. The number of infected lungs was reduced not significant by both treatments (as % pneumonic lesions Co 66.7%, T1 47.1%, T2 31.4%) and the severity of lung lesions was significantly reduced by both high level of CTC and CTC combination medication in feed. 5. Although there were no statistical differences in atrophic rhinitis based on turbinate scores among the 3 groups, the number of mild and moderate (Grade 2 and 3) infections was higher in the control group (9/36) than in the treated groups (T1 2/34 & T2 4/35).

Acknowledgement

Supported by : (주)한국사이나마이드사