小型害鼠与寄生蚤类共存的生物数学模型及定性分析

用动力学方法建立了一类小型害鼠与寄生蚤类共存的生物数学模型,并对模型作了某些简化,初步研究了简化模型的若干性质,以提供流行病防治工作参考。     

安徽黄鳝体内寄生虫调查的初步研究

对长江流域安徽省境内黄鳝体内寄生虫的感染情况进行初步调查,共检出6种寄生蠕虫,其中新棘衣棘头虫感染率最高（41.8％）,其次是鳗鲡独孤吸虫（3.5％）、大型多钩槽绦虫（3.5％）、胃瘤线虫（3.3％）、锯缘叶形吸虫（1.1％）、幼旋尾线虫（0.8％）.新棘衣棘头虫的感染率与黄鳝体长相关,并随季节变化而变化.黄鳝体长小于32.5 cm时,新棘衣棘头虫感染率最低（18.52％）;体长在37.5～42.4 cm时,新棘衣棘头虫感染率最高（46.61％）.新棘衣棘头虫对黄鳝感染率春季最低,秋季感染率最高.黄鳝采集的6个地点寄生虫感染的种类、感染率、感染强度均有所不同.2种寄生虫共感染黄鳝情况较常见,而3种寄生虫共感染比例较低.     

Knowledge Types Used by Researchers and Wool Producers in Australia under a Workplace Learning Typology: Implications for Innovation in the Australian Sheep Industry

Abstract

This paper reports on research into the learning aspects of adopting integrated parasite management practices for sheep (IPM-s) applying a workplace learning framework. An analysis of four primary data sources was conducted; a postal survey of Australian wool producers, a Delphi process with IPM-s researchers, focus groups and interviews with wool producers.

Researchers had a high expectation of conceptual and high level procedural knowledge for IPM-s, while wool producers had a tendency to rely on low- and high-level procedural knowledge for parasite management. Researchers also showed concern for disposition as it related to parasite management. Practices identified as potentially problematic for extension, included worm egg count testing (according to best practice), supplementary feed (specifically for worm management), selecting estimated breeding value-tested rams, weighing and monitoring body condition scores, and keeping written paddock histories.

This research provides significant empirical insights into the knowledge differences between researchers and producers that can affect how research is developed and communicated for the IPM-s project to facilitate behaviour change. The identification of some IPM practices as problematic for producers will also allow targeted extension for these practices.