There is also an important effect of the nutrient digestion sites in the animal. The starch in the corn may partially escape the rumen fermentation for enzymatic digestion to glucose in the intestine, while the carbohydrate in the citrus pulp can only be used by microbial fermentation. Similarly, the advantage of soybean meal is that it can also partially escape the rumen fermentation for subsequent enzymatic digestion to amino acids. By contrast, ammonia from urea is exclusively a nutrient for rumen bacteria. These differences need to be evaluated comparing buffalo and cattle since the digestion physiology may differ according to diverse feeding and environmental systems.