I am and have been PI and Co-I on a number of UK and international research projects in Europe, sub-Saharan Africa, and South America, that aim to improve the efficiency of use of forage resources for livestock production, optimising the balance of feed nutrient use between useful products (meat and milk) and pollutant emissions (methane and nitrogen).

I am Chair in Livestock Science, the University's Director of Sustainable Farming Systems, and IBERS' Director of International Research.  My research interest is improving the use of feed nutrients for efficient livestock production: farming to make use of feeds that people cannot eat to produce foods that people can eat, while minimising the environmental impact of the processes.

Use of forages for improved livestock production

Short and long term effects of reducing protein intake of growing and lactating dairy cattle on immediate and subsequent productivity

Dietary manipulation to reduce methane emissions from ruminant animals

Sustainable intensification of forage-based production systems

Improvement of temperate and tropical forages for improved farmer livelihoods