Robust: The robust farm animal has the ability to express its production potential in a wide range of environments without compromising its reproduction, health and wellbeing (from Colditz and Hine, 2016). 

Colditz, I. G. & Hine, B. C. (2016). Resilience in farm animals: biology, management, breeding and implications for animal welfare. Animal Production Science, 56, 1961-1983. https://doi.org/10.1071/AN15297