ENADE Zootecnia Practice Questions - ENADE Zootecnia - Exame Nacional De Desempenho Dos Estudantes Exam

Fraction C represents acid detergent insoluble nitrogen (ADIN), which is associated with lignin, tannins, and Maillard reaction complexes, and is completely indigestible in both the rumen and lower digestive tract. Fraction C is non-protein nitrogen (NPN), such as urea and free ammonia, characterized by an instantaneous ruminal degradation rate exceeding several hundred percent per hour in the anaerobic rumen environment of cattle. Fraction C consists of rapidly soluble true proteins, including albumins and globulins, that are rapidly degraded by ruminal endopeptidases within minutes of feed ingestion in the rumen of lactating dairy cows. Fraction C is moderately degradable true protein found in plant leaf chloroplasts, which is partially degraded in the rumen and partially absorbed as intact peptides in the small intestine of ruminant animals.