González-Garduño R, Torres-Acosta J F J, Chay-Canul A J
Unidad Regional Universitaria Sursureste, Universidad Autónoma Chapingo, Km 7.5, carretera Teapa-Vicente Guerrero, P.O. Box 29, CP 86800, Teapa, Tabasco, México.
Facultad de Medicina Veterinaria y Zootecnia, Universidad Autónoma de Yucatán, Carr. Mérida-Xmatkuil km 15.5, CP 97100, Mérida, Yucatán, México.
Res Vet Sci. 2014 Jun;96(3):487-92. doi: 10.1016/j.rvsc.2014.03.001. Epub 2014 Mar 20.
The objective was to determine the influence of year, season and age of hair sheep ewes on their susceptibility to gastrointestinal nematodes during pregnancy and lactation and to record the number of treatments within a selective anthelmintic (AH) treatment programme. A trial was performed with 46 grazing ewes kept in hot humid tropical conditions. Data included: average daily weight gain (ADG, kg), packed cell volume (PCV, %) and nematode eggs per gram of faeces (EPG) obtained during 2 years (2009 and 2011-2012). Ewes reaching 1000 EPG were treated with AH. Irrespective of year, season and age, ewes were more susceptible to GIN during lactation (higher EPG, lower PCV and net weight loss) and less susceptible during gestation (lower EPG, higher PCV and net weight gain). As a result, 24.4% of the ewes were left untreated during lactation, while 63.0% of the ewes needed no AH treatment during pregnancy. Even under the hot humid tropical conditions of the farm, the individual EPG helped to maintain a considerable proportion of animals without an AH treatments within the flock.
目的是确定毛用母羊的年份、季节和年龄对其在怀孕和哺乳期间对胃肠道线虫易感性的影响，并记录在选择性驱虫治疗方案中的治疗次数。对46只在炎热潮湿热带条件下放牧的母羊进行了一项试验。数据包括：在2年（2009年以及2011 - 2012年）期间获得的平均日增重（ADG，千克）、红细胞压积（PCV，%）以及每克粪便中的线虫卵数（EPG）。EPG达到1000的母羊接受驱虫治疗。无论年份、季节和年龄如何，母羊在哺乳期间对胃肠道线虫更易感（EPG更高、PCV更低且体重净损失），而在妊娠期间易感性较低（EPG更低、PCV更高且体重净增加）。结果，24.4%的母羊在哺乳期间未接受治疗，而63.0%的母羊在怀孕期不需要驱虫治疗。即使在农场炎热潮湿的热带条件下，个体EPG有助于在羊群中维持相当比例的动物不接受驱虫治疗。
