The researchers looked at how adding enzymes to wheat straw treated with urea affects its digestion. They found that adding enzymes to urea-treated straw increased the breakdown of nutrients, but the effect was not significant compared to enzyme-treated straw alone. The untreated straw had the highest amount of degradable material. Overall, adding enzymes to urea-treated straw improved its digestibility, but not significantly more than enzyme-treated straw alone.