Effects of purified lignin on in vitro ruminal fermentation and growth performance, carcass traits and fecal shedding of Escherichia coli by feedlot lambs

Recently demonstrated antimicrobial activities of purified lignin (PL) co-products from the biorefinery industry suggest that these phenolics may have value as feed additives for ruminants. A 112-d feeding study with lambs, and an in vitro experiment, were conducted to investigate this possibility. In Experiment 1, 36 individually penned newly weaned ewe lambs were randomly assigned to three groups and fed a barley grain-based diet supplemented with the PL product at 0, 15 or 30 g/kg diet dry matter (DM). The lambs, penned indoors, were weighed at 14-d intervals and feed intake was determined weekly. Numbers of generic E. coli in feces were determined using dilution plating on MacConkey agar every 4 weeks. The PL supplement decreased (linear; P=0.055) DM intake, but did not affect growth rate, resulting in a linear improvement ( P