Phiri I K, Phiri A M, Ziela M, Chota A, Masuku M, Monrad J
Department of Clinical Studies, School of Veterinary Medicine, The University of Zambia, PO Box 32379, Lusaka, Zambia.
Trop Anim Health Prod. 2007 May;39(4):309-15. doi: 10.1007/s11250-007-9021-5.
Examination of helminths from gastrointestinal tracts of 125 free-range chickens in Zambia revealed a 95.2% prevalence rate. The species and their prevalences were: Allodapa suctoria (85.6%), Tetrameres americana (80.8%), Ascaridia galli (28.8%), Gonglonema ingluvicola (50.4%), Raillietina spp. (81.6%) and Heterakis gallinarum (32.8%). No trematodes or Syngamus trachea were found. Mixed infections accounted for 88.2% as compared to 7.2% of single infections. Effects of helminthoses on weight gain were investigated in 100 growing chickens randomly assigned to treatment (levamisole) and untreated control groups. There was a significant mean (+/- SEM) weight gain (grams) of 812.8 +/- 51.4 in the treatment group and 623 +/- 57.4 in the control group (p < 0.01). The mean (+/- SEM) worm burdens from the control group and the treatment group were 96.3 +/- 5.61 and 22.05 +/- 2.61, respectively. These results confirm the higher risk of helminth infections in free-range systems and may explain the deleterious effects in chickens.
对赞比亚125只自由放养肉鸡胃肠道内寄生虫的检查显示，感染率为95.2%。其种类及感染率分别为：吸吮异阿地绦虫（85.6%）、美洲四棱线虫（80.8%）、鸡蛔虫（28.8%）、嗉囊筒线虫（50.4%）、赖利绦虫属（81.6%）和鸡异刺线虫（32.8%）。未发现吸虫或气管比翼线虫。混合感染占88.2%，单一感染占7.2%。在100只随机分为治疗组（左旋咪唑）和未治疗对照组的生长肉鸡中，研究了寄生虫病对体重增加的影响。治疗组平均体重增加（克）为812.8±51.4，对照组为623±57.4（p<0.01），差异显著。对照组和治疗组的平均（±SEM）虫负荷分别为96.3±5.61和22.05±2.61。这些结果证实了自由放养系统中寄生虫感染的较高风险，并可能解释了其对肉鸡的有害影响。
