Field response of Lathyrus cicera germplasm to crenate broomrape (Orobanche crenata)

Crenate broomrape (Orobanche crenata Forks.) is a major constraint for grain and forage legume cultivation in Mediterranean agriculture, to which little resistance is available. We studied the response to O. crenata of a germplasm collection of chickling pea (Lathyrus cicera L.) in field trials over two seasons showing that resistance although scarce and masked by confounding factors, is available and can be used in breeding. The level of infection was highly influenced by environmental factors and plant growth cycle. Earlier accessions were less infected due to competition of the earlier settled pods with O. crenata tubercles. O. crenata infection strongly reduced host biomass and grain yield. Deviations from the polynomic regression gave an improved approximation of the true genetic resistance levels present in the germplasm.     

复方盐酸小檗碱可溶性粉剂对雏鸡大肠杆菌病的临床疗效

为了探讨复方盐酸小檗碱对雏鸡大肠杆菌病的临床疗效,本试验选用240只2周龄海兰褐商品代公鸡,随机分为6组,每组40只,第1组为健康对照组;.第2组为感染对照组;第3~5组分别为复方盐酸小檗碱高、中、低剂量组;第6组为诺氟沙星对照组。试验结果表明:复方盐酸小檗碱可溶性粉剂对雏鸡大肠杆菌感染治疗效果明显,治愈率为75.0%~92.5%,推荐剂量为1.5g/kg。     

雏鸡肾型传染性支气管炎治疗效果

对陕西关中地区86个雏鸡肾型传染性支气管炎(肾型IB)病例鸡群按不同用药情况分为五组,并对各组群的用药后的死亡率、70日龄体重、200 d产蛋率进行了跟踪调查和统计学分析。结果显示:A组鸡群的死亡率最低,与对照组差异不显著,而B组和D组死亡率较高,与对照组差异不显著,C组死亡率低,但70日龄体重和对照组产生显著差异,因此,A组的治疗方法死亡率低,且不会影响鸡群以后的生产性能,是临床上较理想的治疗方法。     

鸡球虫的分离与感染试验

[目的]为探讨长期有效的鸡球虫病防控方法奠定基础.[方法]分离并培养鸡球虫卵囊,通过感染雏鸡试验研究其卵囊发育和感染的过程.[结果]分离到的球虫卵囊大多形态饱满,为宽椭圆形,少数为卵圆形,壁光滑,中间明显可见1个圆形核,原生质呈淡褐色,卵囊大小约为18.5～25.5 μm× 16.7～22.5 μm.正常的孢子化卵囊多能见到分化明显的4个孢子,18 h可看到部分卵囊孢子化,36h孢子化达80％.接种后发病雏鸡的体重缓慢增加,血便明显,死亡率较高,同时解剖可见盲肠病变明显,肠壁增厚,严重者因充满大量血液而盲肠肿大.[结论]根据卵囊的形态、发病鸡的临床表现、卵囊寄生部位和盲肠病理变化等特征,初步判断分离的球虫主要为柔嫩艾美耳球虫.