Aumont G
Station de recherches zootechniques, Institut national de la recherche agronomique, Pointe-à-Pitre, Guadeloupe.
Rev Elev Med Vet Pays Trop. 1993;46(1-2):23-6.
The population dynamics of trichostrongylid third stage larvae (L3) around bovine dung were fitted with non-linear models (marginal law) in tropical humid climate in different climatic situations. These marginal models were combined with the survival duration of pats, the weight of cows, the number of pats per cow and per day, the stocking rate and the herbage mass availability, taking into account the patchy grazing behaviour of cattle in order to estimate infestation probability of cattle by third stage larvae. The infestation risk was computed for different ages of herbage regrowth and grazing times in rotational grazing systems. The infestation risk was found to range between 0 to 1400 L3 per kg of dry matter of grass and per day depending on the marginal law. The grazing time, the age of herbage regrowth and the forage availability were the main factors of variation of the infestation risk.
在热带湿润气候下的不同气候条件下，对牛粪周围毛圆科线虫第三期幼虫（L3）的种群动态进行了非线性模型（边际定律）拟合。这些边际模型与牛粪堆的存活时间、奶牛体重、每头奶牛每天的牛粪堆数量、载畜率和牧草可利用量相结合，同时考虑到牛的斑块状放牧行为，以估计牛被第三期幼虫感染的概率。计算了轮牧系统中不同牧草再生年龄和放牧时间的感染风险。根据边际定律，发现感染风险范围为每千克干物质牧草每天0至1400条L3。放牧时间、牧草再生年龄和草料可利用量是感染风险变化的主要因素。
