Influence of cold-pressed canola, brewers grains and hominy meal as dietary supplements suitable for reducing enteric methane emissions from lactating dairy cows

Abstract

There are limited data in the literature concerning in vivo effects of dietary fat supplementation on enteric CH4 emissions from lactating dairy cows. The purpose of this experiment was to evaluate four dietary treatments designated as control (CON), brewers grains (BG), hominy meal and cold-pressed canola (HCC) and hominy meal only (HM) for their effects on CH4 emissions and milk production. Sixteen late lactation Holstein cows were used in pairs, in a double 4×4 Latin square experiment with the four dietary treatments fed as total mixed rations over 24d treatment periods. All diets contained ∼600gforage/kg dry matter (DM; 5kgDM of alfalfa hay and 7kgDM of perennial ryegrass silage/day). Th..