Many experiments were conducted to study the pellet freezing of bull, goat and stallion semen. Frozen bovine semen in concentrated pellet form, with solutions containing egg-yolk, sugars and glycerol increased fertilizing capacity, over that of other methods tested and of low efficiency sires. In this form semen can be frozen at semi-rapid rates with less glycerol. This method was also effective in preserving the viability and fertility of stallion and goat spermatozoa at high level.