Tembely S, Lahlou-Kassi A, Rege J E, Mukasa-Mugerwa E, Anindo D, Sovani S, Baker R L
International Livestock Research Institute, Addis Ababa, Ethiopia.
Vet Parasitol. 1998 Jun 15;77(2-3):123-32. doi: 10.1016/s0304-4017(97)00219-7.
A study was carried out at the International Livestock Research Institute (ILRI) Debre Berhan Research Station in Ethiopia from 1992 to 1995 to compare the peri-parturient rise (PPR) in faecal nematode egg counts (FEC) in ewes of two indigenous sheep breeds. A total of 1439 Menz and 1347 Horro ewes were single sire mated following oestrus synchronization to lamb in the wet and dry season. Three ewe treatment groups were constituted as mated/lactating/undrenched; mated/lactating/drenched; unmated/undrenched for three wet and three dry lambing seasons. All ewes grazed naturally contaminated pasture. Levels of faecal egg output were monitored at mating, 3 months after mating, 2 weeks before lambing, 4, 8 and 12 weeks post-lambing. A significant PPR in FEC occurred 2 weeks before lambing and peaked at 4 weeks post-parturition in ewes lambing just before the beginning of the dry season (October/November). There was no significant increase in FEC when lambing occurred before the onset of the long rainy season (May/June). The PPR in this study was associated with both lactation and seasonal availability of third-stage infective larvae on pasture. There was no consistent breed difference in FEC during the six sampling periods from mating to weaning. Faecal cultures and worm counts from both breeds confirmed the presence of Longistrongylus (Pseudomarshallagia) elongata, Trichostrongylus spp.and Haemonchus contortus. The role of the peri-parturient rise of FEC in ewes in gastrointestinal nematode transmission is discussed.
1992年至1995年，在埃塞俄比亚的国际家畜研究所（ILRI）德布雷伯尔汉研究站开展了一项研究，比较两个本地绵羊品种母羊粪便线虫卵计数（FEC）的围产期上升（PPR）情况。总共1439只门兹母羊和1347只霍罗母羊在发情同步后进行单公配种，以便在雨季和旱季产羔。三个母羊处理组分别为配种/哺乳/未驱虫；配种/哺乳/驱虫；未配种/未驱虫，历经三个雨季和三个旱季产羔期。所有母羊均在自然污染的牧场放牧。在配种时、配种后3个月、产羔前2周、产后4周、8周和12周监测粪便虫卵排出水平。在旱季开始前（10月/11月）产羔的母羊中，FEC在产羔前2周出现显著的PPR，并在产后4周达到峰值。在长雨季开始前（5月/6月）产羔时，FEC没有显著增加。本研究中的PPR与泌乳以及牧场上三期感染性幼虫的季节性可得性均有关。从配种到断奶的六个采样期内，两个品种在FEC方面没有一致的品种差异。两个品种的粪便培养和蠕虫计数均证实存在长圆长线虫（假马歇尔线虫属）、毛圆线虫属和捻转血矛线虫。本文讨论了母羊FEC围产期上升在胃肠道线虫传播中的作用。
