Life liberation is considered as the BEST and FASTEST way of accumulating infinite merits. Saving a cow from slaughterhouse, can immediately accumulate merits that is equivalent to 700 million times recitation of Om-Mani-Padme-Hum! One who liberate life, appreciates the true value of life, and when he pray, his wish will be easily granted due to the power of compassion that connect them to Buddha. He will also be protected from harm (from human, spiritual beings, animals etc), natural disasters, and accidents (air, land, sea etc).