A Note on the Estimation of Larval Concentrations on Pasture

Abstract

In a recent paper by Tallis and Donald (1964)t [which will be referred to subsequently as (T.D.)] models were developed to describe the distribution on pasture of the infective larvae of gastrointestinal nematode parasites of sheep. It was pointed out that the distribution of faecal deposits, the number of eggs per deposit, and the developmental rate to the infective larval stage were three important components determining the total larval distribution. Moreover, formulae for the expected concentration of larvae on the pasture lead to straightforward methods of estimation which are free from large biases.