Methane emission, nutrient digestibility, and rumen microbiota in Holstein heifers fed fourteen different grass or clover silages as the sole feed

This experiment investigated the variation in enteric methane (CH4) production and associated gas exchange parameters, nutrient digestibility, rumen fermentation, and rumen microbiome when a range of silages based on two different forage types (grass or clover) and different species within the two types, were fed as the sole feed to heifers.