Effect of diets differing in protein concentration (low vs medium) and nitrogen source (urea vs soybean meal) on in vitro rumen fermentation and on performance of finishing Italian Simmental bulls

In conclusion, L diets tended to decrease weight gain in finishing Italian Simmental bulls, but both PDI levels and SBM substitution with U had no detrimental effects on slaughter and meat quality traits. Further research efforts are required to explain the increase of butyrate in fermentation fluid of fermenters fed medium PDI diets or U diets.