Bypass nutrients have emerged as an important nutritional strategy for improving the productivity, health and reproductive efficiency of dairy animals. In high-yielding dairy cows and buffaloes, conventional feeding practices often fail to supply sufficient nutrients because a large proportion of dietary protein and energy is degraded in the rumen before absorption. Bypass nutrients are specially protected feed components that escape ruminal degradation and become available for digestion in the intestine, thereby improving nutrient utilization efficiency. The major bypass nutrients include bypass protein, bypass fat and protected amino acids such as methionine and lysine. Supplementation of bypass protein enhances amino acid availability for milk synthesis, growth and reproductive functions, while bypass fat provides concentrated energy during periods of high metabolic demand, particularly in early lactation. Protected amino acids support milk protein synthesis, liver function and immune response. Feeding bypass nutrients helps reduce negative energy balance, ketosis and other metabolic disorders commonly observed during the transition period. In addition, these nutrients improve milk yield, milk fat percentage, body condition score, conception rate and overall animal performance. Bypass feeding is also beneficial under tropical conditions where poor-quality roughages are widely used. Improved nutrient utilization through bypass supplementation contributes to sustainable dairy farming by reducing nutrient wastage and enhancing feed conversion efficiency. Despite their advantages, factors such as cost, quality control and balanced ration formulation must be considered for effective utilization. Recent advancements in feed processing technologies and rumenprotection techniques are expanding the scope of bypass nutrition in modern dairy production systems. Overall, bypass nutrients represent an effective approach for maximizing production efficiency, improving animal welfare and increasing profitability in the dairy sector.