Effect of concentrate feeding level on methane emissions, production performance and rumen fermentation of Jersey cows grazing ryegrass pasture during spring

The Western Cape Agricultural Research Trust (Elsenburg, South Africa), Western Cape Department of Agriculture (Elsenburg, South Africa) and to the Department of Animal and Wildlife Sciences at the University of Pretoria (Pretoria, South Africa) as well as the National Research Foundation (NRF; Pretoria, South Africa).