Wood kraft pulp supplementation alters the rumen fermentation characteristics and epithelial transcriptomes in Holstein cattle during the high-grain diet challenge

We investigated the effects of wood kraft pulp (WP) supplementation on ruminal pH, fermentation, and epithelial transcriptomic dynamics in Holstein cattle during the high-grain diet challenge. Five rumen-fistulated Holstein bulls (215.2 ± 20.4 kg of body weight; 7.4 ± 0.3 months of age) were used in a cross-over design without a wash-out period. Cattle were fed a high-grain diet containing corn flakes (control diet) or the WP as a half replacement of corn flakes in the control diet (WP diet) during the first 14 days, and then, the diets were switched for last 14 days.