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首页> 外文期刊>Parasitology >A model to account for the consequences of host nutrition on the outcome of gastrointestinal parasitism in sheep: logic and concepts.
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A model to account for the consequences of host nutrition on the outcome of gastrointestinal parasitism in sheep: logic and concepts.

机译：一个模型，用于解释宿主营养对绵羊胃肠道寄生虫后果的影响：逻辑和概念。

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摘要

A deterministic, dynamic simulation model is developed to account for the interactions between gastrointestinal parasitism and host nutrition, and predict their consequences on performance and level of parasitism of sheep. Larval intake and established adult worms are assumed to result in nutrient loss for the host. In order to reduce this loss the host will mount an immune response, which will affect the establishment rate of incoming larvae, mortality rate of adult worms, and fecundity of female worms, as well as nutrient loss caused by larval intake per se. Host anorexia is modelled as a function of worm mass. Parasitism is also assumed to affect the allocation of ingested nutrients to the host's bodily functions, with maintenance getting absolute priority, and protein allocated to immunity and production proportionally to their requirements. Inputs to the model include the expected growth attributes of the animal, feed quality, various parasitological parameters and daily larval intake. Outputs include feed intake, growth rate and body composition, as well as worm burden and faecal egg counts. The model allows exploration of the consequences of gastrointestinal parasitism on sheep of different growth characteristics, kept under environments that vary in the provision of nutrients and exposure to parasites.
机译：建立了确定性的动态仿真模型，以说明胃肠道寄生虫与宿主营养之间的相互作用，并预测它们对绵羊的寄生虫性能和水平的影响。假定幼虫的摄入和成熟的成虫会导致宿主营养损失。为了减少这种损失，宿主将发起免疫反应，这将影响传入幼虫的建立率，成虫的死亡率，雌虫的繁殖力以及幼虫本身摄入引起的营养损失。宿主厌食被建模为蠕虫质量的函数。还假定寄生虫会影响摄入的营养物对宿主身体机能的分配，其中绝对优先考虑的是维持，并且将蛋白质分配给其免疫力和生产能力与其需求成比例。该模型的输入包括动物的预期生长属性，饲料质量，各种寄生虫学参数和每日幼体摄入量。输出包括饲料摄入量，生长速度和身体组成，以及蠕虫负担和粪便卵数。该模型可以探索在不同养分和暴露于寄生虫的环境下饲养的不同生长特性的绵羊对胃肠道寄生虫的后果。

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